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Model Changes\nclass Post(models.Model):\n title = models.CharField(max_length=200)\n content = models.TextField()\n # Adding a new field\n author = models.ForeignKey(User, on_delete=models.CASCADE)\n\n# 2. Generate Migration\n# python manage.py makemigrations\n\n# 3. Review Generated Migration\n# migrations/0002_post_author.py\n\n# 4. Apply Migration\n# python manage.py migrate\n\n# 5. Database Schema Updated\n# ALTER TABLE blog_post ADD COLUMN author_id INTEGER NOT NULL;\n","python","",[1085,1086,1087,1096,1103,1109,1137,1171,1189,1195,1233,1238,1244,1250,1255,1261,1267,1272,1278,1284,1289,1295],"code",{"__ignoreMap":1083},[1088,1089,1092],"span",{"class":1090,"line":1091},"line",1,[1088,1093,1095],{"class":1094},"s9Tkl","# The migration process follows this lifecycle:\n",[1088,1097,1099],{"class":1090,"line":1098},2,[1088,1100,1102],{"emptyLinePlaceholder":1101},true,"\n",[1088,1104,1106],{"class":1090,"line":1105},3,[1088,1107,1108],{"class":1094},"# 1. Model Changes\n",[1088,1110,1112,1116,1120,1124,1128,1131,1134],{"class":1090,"line":1111},4,[1088,1113,1115],{"class":1114},"s5Kfy","class",[1088,1117,1119],{"class":1118},"sD-vU"," Post",[1088,1121,1123],{"class":1122},"soVBu","(",[1088,1125,1127],{"class":1126},"sYn-s","models",[1088,1129,1130],{"class":1122},".",[1088,1132,1133],{"class":1126},"Model",[1088,1135,1136],{"class":1122},"):\n",[1088,1138,1140,1144,1147,1150,1152,1156,1158,1162,1164,1168],{"class":1090,"line":1139},5,[1088,1141,1143],{"class":1142},"sftqT"," title ",[1088,1145,1146],{"class":1122},"=",[1088,1148,1149],{"class":1142}," models",[1088,1151,1130],{"class":1122},[1088,1153,1155],{"class":1154},"siWMO","CharField",[1088,1157,1123],{"class":1122},[1088,1159,1161],{"class":1160},"sqOPj","max_length",[1088,1163,1146],{"class":1122},[1088,1165,1167],{"class":1166},"s7CZa","200",[1088,1169,1170],{"class":1122},")\n",[1088,1172,1174,1177,1179,1181,1183,1186],{"class":1090,"line":1173},6,[1088,1175,1176],{"class":1142}," content ",[1088,1178,1146],{"class":1122},[1088,1180,1149],{"class":1142},[1088,1182,1130],{"class":1122},[1088,1184,1185],{"class":1154},"TextField",[1088,1187,1188],{"class":1122},"()\n",[1088,1190,1192],{"class":1090,"line":1191},7,[1088,1193,1194],{"class":1094}," # Adding a new field\n",[1088,1196,1198,1201,1203,1205,1207,1210,1212,1215,1218,1221,1223,1225,1227,1231],{"class":1090,"line":1197},8,[1088,1199,1200],{"class":1142}," author ",[1088,1202,1146],{"class":1122},[1088,1204,1149],{"class":1142},[1088,1206,1130],{"class":1122},[1088,1208,1209],{"class":1154},"ForeignKey",[1088,1211,1123],{"class":1122},[1088,1213,1214],{"class":1154},"User",[1088,1216,1217],{"class":1122},",",[1088,1219,1220],{"class":1160}," on_delete",[1088,1222,1146],{"class":1122},[1088,1224,1127],{"class":1154},[1088,1226,1130],{"class":1122},[1088,1228,1230],{"class":1229},"sFGJz","CASCADE",[1088,1232,1170],{"class":1122},[1088,1234,1236],{"class":1090,"line":1235},9,[1088,1237,1102],{"emptyLinePlaceholder":1101},[1088,1239,1241],{"class":1090,"line":1240},10,[1088,1242,1243],{"class":1094},"# 2. Generate Migration\n",[1088,1245,1247],{"class":1090,"line":1246},11,[1088,1248,1249],{"class":1094},"# python manage.py makemigrations\n",[1088,1251,1253],{"class":1090,"line":1252},12,[1088,1254,1102],{"emptyLinePlaceholder":1101},[1088,1256,1258],{"class":1090,"line":1257},13,[1088,1259,1260],{"class":1094},"# 3. Review Generated Migration\n",[1088,1262,1264],{"class":1090,"line":1263},14,[1088,1265,1266],{"class":1094},"# migrations/0002_post_author.py\n",[1088,1268,1270],{"class":1090,"line":1269},15,[1088,1271,1102],{"emptyLinePlaceholder":1101},[1088,1273,1275],{"class":1090,"line":1274},16,[1088,1276,1277],{"class":1094},"# 4. Apply Migration\n",[1088,1279,1281],{"class":1090,"line":1280},17,[1088,1282,1283],{"class":1094},"# python manage.py migrate\n",[1088,1285,1287],{"class":1090,"line":1286},18,[1088,1288,1102],{"emptyLinePlaceholder":1101},[1088,1290,1292],{"class":1090,"line":1291},19,[1088,1293,1294],{"class":1094},"# 5. Database Schema Updated\n",[1088,1296,1298],{"class":1090,"line":1297},20,[1088,1299,1300],{"class":1094},"# ALTER TABLE blog_post ADD COLUMN author_id INTEGER NOT NULL;\n",[1030,1302,1304],{"id":1303},"basic-migration-operations","Basic Migration Operations",[1073,1306,1308],{"id":1307},"creating-your-first-migration","Creating Your First Migration",[1078,1310,1312],{"className":1080,"code":1311,"language":1082,"meta":1083,"style":1083},"# models.py - Initial model\nfrom django.db import models\n\nclass Category(models.Model):\n name = models.CharField(max_length=100)\n description = models.TextField(blank=True)\n created_at = models.DateTimeField(auto_now_add=True)\n \n def __str__(self):\n return self.name\n\nclass Post(models.Model):\n title = models.CharField(max_length=200)\n content = models.TextField()\n category = models.ForeignKey(Category, on_delete=models.CASCADE)\n created_at = models.DateTimeField(auto_now_add=True)\n \n def __str__(self):\n return self.title\n\n# Generate initial migration\n# python manage.py makemigrations blog\n\n# Generated migration file: blog/migrations/0001_initial.py\nfrom django.db import migrations, models\nimport django.db.models.deletion\n\nclass Migration(migrations.Migration):\n initial = True\n \n dependencies = []\n \n operations = [\n migrations.CreateModel(\n name='Category',\n fields=[\n ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),\n ('name', models.CharField(max_length=100)),\n ('description', models.TextField(blank=True)),\n ('created_at', models.DateTimeField(auto_now_add=True)),\n ],\n ),\n migrations.CreateModel(\n name='Post',\n fields=[\n ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),\n ('title', models.CharField(max_length=200)),\n ('content', models.TextField()),\n ('created_at', models.DateTimeField(auto_now_add=True)),\n ('category', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='blog.category')),\n ],\n ),\n ]\n",[1085,1313,1314,1319,1339,1343,1360,1384,1410,1435,1440,1457,1472,1476,1492,1514,1528,1560,1582,1586,1598,1609,1613,1619,1625,1630,1636,1656,1677,1682,1701,1712,1717,1728,1733,1744,1758,1778,1787,1854,1884,1914,1944,1950,1956,1967,1983,1990,2047,2077,2100,2129,2192,2197,2202],{"__ignoreMap":1083},[1088,1315,1316],{"class":1090,"line":1091},[1088,1317,1318],{"class":1094},"# models.py - Initial model\n",[1088,1320,1321,1325,1328,1330,1333,1336],{"class":1090,"line":1098},[1088,1322,1324],{"class":1323},"siDh9","from",[1088,1326,1327],{"class":1142}," django",[1088,1329,1130],{"class":1122},[1088,1331,1332],{"class":1142},"db ",[1088,1334,1335],{"class":1323},"import",[1088,1337,1338],{"class":1142}," models\n",[1088,1340,1341],{"class":1090,"line":1105},[1088,1342,1102],{"emptyLinePlaceholder":1101},[1088,1344,1345,1347,1350,1352,1354,1356,1358],{"class":1090,"line":1111},[1088,1346,1115],{"class":1114},[1088,1348,1349],{"class":1118}," Category",[1088,1351,1123],{"class":1122},[1088,1353,1127],{"class":1126},[1088,1355,1130],{"class":1122},[1088,1357,1133],{"class":1126},[1088,1359,1136],{"class":1122},[1088,1361,1362,1365,1367,1369,1371,1373,1375,1377,1379,1382],{"class":1090,"line":1139},[1088,1363,1364],{"class":1142}," name ",[1088,1366,1146],{"class":1122},[1088,1368,1149],{"class":1142},[1088,1370,1130],{"class":1122},[1088,1372,1155],{"class":1154},[1088,1374,1123],{"class":1122},[1088,1376,1161],{"class":1160},[1088,1378,1146],{"class":1122},[1088,1380,1381],{"class":1166},"100",[1088,1383,1170],{"class":1122},[1088,1385,1386,1389,1391,1393,1395,1397,1399,1402,1404,1408],{"class":1090,"line":1173},[1088,1387,1388],{"class":1142}," description ",[1088,1390,1146],{"class":1122},[1088,1392,1149],{"class":1142},[1088,1394,1130],{"class":1122},[1088,1396,1185],{"class":1154},[1088,1398,1123],{"class":1122},[1088,1400,1401],{"class":1160},"blank",[1088,1403,1146],{"class":1122},[1088,1405,1407],{"class":1406},"s8XtY","True",[1088,1409,1170],{"class":1122},[1088,1411,1412,1415,1417,1419,1421,1424,1426,1429,1431,1433],{"class":1090,"line":1191},[1088,1413,1414],{"class":1142}," created_at ",[1088,1416,1146],{"class":1122},[1088,1418,1149],{"class":1142},[1088,1420,1130],{"class":1122},[1088,1422,1423],{"class":1154},"DateTimeField",[1088,1425,1123],{"class":1122},[1088,1427,1428],{"class":1160},"auto_now_add",[1088,1430,1146],{"class":1122},[1088,1432,1407],{"class":1406},[1088,1434,1170],{"class":1122},[1088,1436,1437],{"class":1090,"line":1197},[1088,1438,1439],{"class":1142}," \n",[1088,1441,1442,1445,1449,1451,1455],{"class":1090,"line":1235},[1088,1443,1444],{"class":1114}," def",[1088,1446,1448],{"class":1447},"sJdAF"," __str__",[1088,1450,1123],{"class":1122},[1088,1452,1454],{"class":1453},"sRjD_","self",[1088,1456,1136],{"class":1122},[1088,1458,1459,1462,1466,1468],{"class":1090,"line":1240},[1088,1460,1461],{"class":1323}," return",[1088,1463,1465],{"class":1464},"se3Ec"," self",[1088,1467,1130],{"class":1122},[1088,1469,1471],{"class":1470},"sBPpx","name\n",[1088,1473,1474],{"class":1090,"line":1246},[1088,1475,1102],{"emptyLinePlaceholder":1101},[1088,1477,1478,1480,1482,1484,1486,1488,1490],{"class":1090,"line":1252},[1088,1479,1115],{"class":1114},[1088,1481,1119],{"class":1118},[1088,1483,1123],{"class":1122},[1088,1485,1127],{"class":1126},[1088,1487,1130],{"class":1122},[1088,1489,1133],{"class":1126},[1088,1491,1136],{"class":1122},[1088,1493,1494,1496,1498,1500,1502,1504,1506,1508,1510,1512],{"class":1090,"line":1257},[1088,1495,1143],{"class":1142},[1088,1497,1146],{"class":1122},[1088,1499,1149],{"class":1142},[1088,1501,1130],{"class":1122},[1088,1503,1155],{"class":1154},[1088,1505,1123],{"class":1122},[1088,1507,1161],{"class":1160},[1088,1509,1146],{"class":1122},[1088,1511,1167],{"class":1166},[1088,1513,1170],{"class":1122},[1088,1515,1516,1518,1520,1522,1524,1526],{"class":1090,"line":1263},[1088,1517,1176],{"class":1142},[1088,1519,1146],{"class":1122},[1088,1521,1149],{"class":1142},[1088,1523,1130],{"class":1122},[1088,1525,1185],{"class":1154},[1088,1527,1188],{"class":1122},[1088,1529,1530,1533,1535,1537,1539,1541,1543,1546,1548,1550,1552,1554,1556,1558],{"class":1090,"line":1269},[1088,1531,1532],{"class":1142}," category ",[1088,1534,1146],{"class":1122},[1088,1536,1149],{"class":1142},[1088,1538,1130],{"class":1122},[1088,1540,1209],{"class":1154},[1088,1542,1123],{"class":1122},[1088,1544,1545],{"class":1154},"Category",[1088,1547,1217],{"class":1122},[1088,1549,1220],{"class":1160},[1088,1551,1146],{"class":1122},[1088,1553,1127],{"class":1154},[1088,1555,1130],{"class":1122},[1088,1557,1230],{"class":1229},[1088,1559,1170],{"class":1122},[1088,1561,1562,1564,1566,1568,1570,1572,1574,1576,1578,1580],{"class":1090,"line":1274},[1088,1563,1414],{"class":1142},[1088,1565,1146],{"class":1122},[1088,1567,1149],{"class":1142},[1088,1569,1130],{"class":1122},[1088,1571,1423],{"class":1154},[1088,1573,1123],{"class":1122},[1088,1575,1428],{"class":1160},[1088,1577,1146],{"class":1122},[1088,1579,1407],{"class":1406},[1088,1581,1170],{"class":1122},[1088,1583,1584],{"class":1090,"line":1280},[1088,1585,1439],{"class":1142},[1088,1587,1588,1590,1592,1594,1596],{"class":1090,"line":1286},[1088,1589,1444],{"class":1114},[1088,1591,1448],{"class":1447},[1088,1593,1123],{"class":1122},[1088,1595,1454],{"class":1453},[1088,1597,1136],{"class":1122},[1088,1599,1600,1602,1604,1606],{"class":1090,"line":1291},[1088,1601,1461],{"class":1323},[1088,1603,1465],{"class":1464},[1088,1605,1130],{"class":1122},[1088,1607,1608],{"class":1470},"title\n",[1088,1610,1611],{"class":1090,"line":1297},[1088,1612,1102],{"emptyLinePlaceholder":1101},[1088,1614,1616],{"class":1090,"line":1615},21,[1088,1617,1618],{"class":1094},"# Generate initial migration\n",[1088,1620,1622],{"class":1090,"line":1621},22,[1088,1623,1624],{"class":1094},"# python manage.py makemigrations blog\n",[1088,1626,1628],{"class":1090,"line":1627},23,[1088,1629,1102],{"emptyLinePlaceholder":1101},[1088,1631,1633],{"class":1090,"line":1632},24,[1088,1634,1635],{"class":1094},"# Generated migration file: blog/migrations/0001_initial.py\n",[1088,1637,1639,1641,1643,1645,1647,1649,1652,1654],{"class":1090,"line":1638},25,[1088,1640,1324],{"class":1323},[1088,1642,1327],{"class":1142},[1088,1644,1130],{"class":1122},[1088,1646,1332],{"class":1142},[1088,1648,1335],{"class":1323},[1088,1650,1651],{"class":1142}," migrations",[1088,1653,1217],{"class":1122},[1088,1655,1338],{"class":1142},[1088,1657,1659,1661,1663,1665,1668,1670,1672,1674],{"class":1090,"line":1658},26,[1088,1660,1335],{"class":1323},[1088,1662,1327],{"class":1142},[1088,1664,1130],{"class":1122},[1088,1666,1667],{"class":1470},"db",[1088,1669,1130],{"class":1122},[1088,1671,1127],{"class":1470},[1088,1673,1130],{"class":1122},[1088,1675,1676],{"class":1470},"deletion\n",[1088,1678,1680],{"class":1090,"line":1679},27,[1088,1681,1102],{"emptyLinePlaceholder":1101},[1088,1683,1685,1687,1690,1692,1694,1696,1699],{"class":1090,"line":1684},28,[1088,1686,1115],{"class":1114},[1088,1688,1689],{"class":1118}," Migration",[1088,1691,1123],{"class":1122},[1088,1693,1024],{"class":1126},[1088,1695,1130],{"class":1122},[1088,1697,1698],{"class":1126},"Migration",[1088,1700,1136],{"class":1122},[1088,1702,1704,1707,1709],{"class":1090,"line":1703},29,[1088,1705,1706],{"class":1142}," initial ",[1088,1708,1146],{"class":1122},[1088,1710,1711],{"class":1406}," True\n",[1088,1713,1715],{"class":1090,"line":1714},30,[1088,1716,1439],{"class":1142},[1088,1718,1720,1723,1725],{"class":1090,"line":1719},31,[1088,1721,1722],{"class":1142}," dependencies ",[1088,1724,1146],{"class":1122},[1088,1726,1727],{"class":1122}," []\n",[1088,1729,1731],{"class":1090,"line":1730},32,[1088,1732,1439],{"class":1142},[1088,1734,1736,1739,1741],{"class":1090,"line":1735},33,[1088,1737,1738],{"class":1142}," operations ",[1088,1740,1146],{"class":1122},[1088,1742,1743],{"class":1122}," [\n",[1088,1745,1747,1750,1752,1755],{"class":1090,"line":1746},34,[1088,1748,1749],{"class":1142}," migrations",[1088,1751,1130],{"class":1122},[1088,1753,1754],{"class":1154},"CreateModel",[1088,1756,1757],{"class":1122},"(\n",[1088,1759,1761,1764,1766,1770,1773,1775],{"class":1090,"line":1760},35,[1088,1762,1763],{"class":1160}," name",[1088,1765,1146],{"class":1122},[1088,1767,1769],{"class":1768},"sbYkP","'",[1088,1771,1545],{"class":1772},"sTbE_",[1088,1774,1769],{"class":1768},[1088,1776,1777],{"class":1122},",\n",[1088,1779,1781,1784],{"class":1090,"line":1780},36,[1088,1782,1783],{"class":1160}," fields",[1088,1785,1786],{"class":1122},"=[\n",[1088,1788,1790,1793,1795,1798,1800,1802,1804,1806,1809,1811,1814,1816,1818,1820,1823,1825,1827,1829,1832,1834,1837,1839,1842,1844,1846,1849,1851],{"class":1090,"line":1789},37,[1088,1791,1792],{"class":1122}," (",[1088,1794,1769],{"class":1768},[1088,1796,1797],{"class":1772},"id",[1088,1799,1769],{"class":1768},[1088,1801,1217],{"class":1122},[1088,1803,1149],{"class":1154},[1088,1805,1130],{"class":1122},[1088,1807,1808],{"class":1154},"AutoField",[1088,1810,1123],{"class":1122},[1088,1812,1813],{"class":1160},"auto_created",[1088,1815,1146],{"class":1122},[1088,1817,1407],{"class":1406},[1088,1819,1217],{"class":1122},[1088,1821,1822],{"class":1160}," 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verbose_name",[1088,1843,1146],{"class":1122},[1088,1845,1769],{"class":1768},[1088,1847,1848],{"class":1772},"ID",[1088,1850,1769],{"class":1768},[1088,1852,1853],{"class":1122},")),\n",[1088,1855,1857,1859,1861,1864,1866,1868,1870,1872,1874,1876,1878,1880,1882],{"class":1090,"line":1856},38,[1088,1858,1792],{"class":1122},[1088,1860,1769],{"class":1768},[1088,1862,1863],{"class":1772},"name",[1088,1865,1769],{"class":1768},[1088,1867,1217],{"class":1122},[1088,1869,1149],{"class":1154},[1088,1871,1130],{"class":1122},[1088,1873,1155],{"class":1154},[1088,1875,1123],{"class":1122},[1088,1877,1161],{"class":1160},[1088,1879,1146],{"class":1122},[1088,1881,1381],{"class":1166},[1088,1883,1853],{"class":1122},[1088,1885,1887,1889,1891,1894,1896,1898,1900,1902,1904,1906,1908,1910,1912],{"class":1090,"line":1886},39,[1088,1888,1792],{"class":1122},[1088,1890,1769],{"class":1768},[1088,1892,1893],{"class":1772},"description",[1088,1895,1769],{"class":1768},[1088,1897,1217],{"class":1122},[1088,1899,1149],{"class":1154},[1088,1901,1130],{"class":1122},[1088,1903,1185],{"class":1154},[1088,1905,1123],{"class":1122},[1088,1907,1401],{"class":1160},[1088,1909,1146],{"class":1122},[1088,1911,1407],{"class":1406},[1088,1913,1853],{"class":1122},[1088,1915,1917,1919,1921,1924,1926,1928,1930,1932,1934,1936,1938,1940,1942],{"class":1090,"line":1916},40,[1088,1918,1792],{"class":1122},[1088,1920,1769],{"class":1768},[1088,1922,1923],{"class":1772},"created_at",[1088,1925,1769],{"class":1768},[1088,1927,1217],{"class":1122},[1088,1929,1149],{"class":1154},[1088,1931,1130],{"class":1122},[1088,1933,1423],{"class":1154},[1088,1935,1123],{"class":1122},[1088,1937,1428],{"class":1160},[1088,1939,1146],{"class":1122},[1088,1941,1407],{"class":1406},[1088,1943,1853],{"class":1122},[1088,1945,1947],{"class":1090,"line":1946},41,[1088,1948,1949],{"class":1122}," ],\n",[1088,1951,1953],{"class":1090,"line":1952},42,[1088,1954,1955],{"class":1122}," ),\n",[1088,1957,1959,1961,1963,1965],{"class":1090,"line":1958},43,[1088,1960,1749],{"class":1142},[1088,1962,1130],{"class":1122},[1088,1964,1754],{"class":1154},[1088,1966,1757],{"class":1122},[1088,1968,1970,1972,1974,1976,1979,1981],{"class":1090,"line":1969},44,[1088,1971,1763],{"class":1160},[1088,1973,1146],{"class":1122},[1088,1975,1769],{"class":1768},[1088,1977,1978],{"class":1772},"Post",[1088,1980,1769],{"class":1768},[1088,1982,1777],{"class":1122},[1088,1984,1986,1988],{"class":1090,"line":1985},45,[1088,1987,1783],{"class":1160},[1088,1989,1786],{"class":1122},[1088,1991,1993,1995,1997,1999,2001,2003,2005,2007,2009,2011,2013,2015,2017,2019,2021,2023,2025,2027,2029,2031,2033,2035,2037,2039,2041,2043,2045],{"class":1090,"line":1992},46,[1088,1994,1792],{"class":1122},[1088,1996,1769],{"class":1768},[1088,1998,1797],{"class":1772},[1088,2000,1769],{"class":1768},[1088,2002,1217],{"class":1122},[1088,2004,1149],{"class":1154},[1088,2006,1130],{"class":1122},[1088,2008,1808],{"class":1154},[1088,2010,1123],{"class":1122},[1088,2012,1813],{"class":1160},[1088,2014,1146],{"class":1122},[1088,2016,1407],{"class":1406},[1088,2018,1217],{"class":1122},[1088,2020,1822],{"class":1160},[1088,2022,1146],{"class":1122},[1088,2024,1407],{"class":1406},[1088,2026,1217],{"class":1122},[1088,2028,1831],{"class":1160},[1088,2030,1146],{"class":1122},[1088,2032,1836],{"class":1406},[1088,2034,1217],{"class":1122},[1088,2036,1841],{"class":1160},[1088,2038,1146],{"class":1122},[1088,2040,1769],{"class":1768},[1088,2042,1848],{"class":1772},[1088,2044,1769],{"class":1768},[1088,2046,1853],{"class":1122},[1088,2048,2050,2052,2054,2057,2059,2061,2063,2065,2067,2069,2071,2073,2075],{"class":1090,"line":2049},47,[1088,2051,1792],{"class":1122},[1088,2053,1769],{"class":1768},[1088,2055,2056],{"class":1772},"title",[1088,2058,1769],{"class":1768},[1088,2060,1217],{"class":1122},[1088,2062,1149],{"class":1154},[1088,2064,1130],{"class":1122},[1088,2066,1155],{"class":1154},[1088,2068,1123],{"class":1122},[1088,2070,1161],{"class":1160},[1088,2072,1146],{"class":1122},[1088,2074,1167],{"class":1166},[1088,2076,1853],{"class":1122},[1088,2078,2080,2082,2084,2087,2089,2091,2093,2095,2097],{"class":1090,"line":2079},48,[1088,2081,1792],{"class":1122},[1088,2083,1769],{"class":1768},[1088,2085,2086],{"class":1772},"content",[1088,2088,1769],{"class":1768},[1088,2090,1217],{"class":1122},[1088,2092,1149],{"class":1154},[1088,2094,1130],{"class":1122},[1088,2096,1185],{"class":1154},[1088,2098,2099],{"class":1122},"()),\n",[1088,2101,2103,2105,2107,2109,2111,2113,2115,2117,2119,2121,2123,2125,2127],{"class":1090,"line":2102},49,[1088,2104,1792],{"class":1122},[1088,2106,1769],{"class":1768},[1088,2108,1923],{"class":1772},[1088,2110,1769],{"class":1768},[1088,2112,1217],{"class":1122},[1088,2114,1149],{"class":1154},[1088,2116,1130],{"class":1122},[1088,2118,1423],{"class":1154},[1088,2120,1123],{"class":1122},[1088,2122,1428],{"class":1160},[1088,2124,1146],{"class":1122},[1088,2126,1407],{"class":1406},[1088,2128,1853],{"class":1122},[1088,2130,2132,2134,2136,2139,2141,2143,2145,2147,2149,2151,2154,2156,2159,2161,2163,2165,2167,2169,2172,2174,2176,2178,2181,2183,2185,2188,2190],{"class":1090,"line":2131},50,[1088,2133,1792],{"class":1122},[1088,2135,1769],{"class":1768},[1088,2137,2138],{"class":1772},"category",[1088,2140,1769],{"class":1768},[1088,2142,1217],{"class":1122},[1088,2144,1149],{"class":1154},[1088,2146,1130],{"class":1122},[1088,2148,1209],{"class":1154},[1088,2150,1123],{"class":1122},[1088,2152,2153],{"class":1160},"on_delete",[1088,2155,1146],{"class":1122},[1088,2157,2158],{"class":1154},"django",[1088,2160,1130],{"class":1122},[1088,2162,1667],{"class":1470},[1088,2164,1130],{"class":1122},[1088,2166,1127],{"class":1470},[1088,2168,1130],{"class":1122},[1088,2170,2171],{"class":1470},"deletion",[1088,2173,1130],{"class":1122},[1088,2175,1230],{"class":1229},[1088,2177,1217],{"class":1122},[1088,2179,2180],{"class":1160}," to",[1088,2182,1146],{"class":1122},[1088,2184,1769],{"class":1768},[1088,2186,2187],{"class":1772},"blog.category",[1088,2189,1769],{"class":1768},[1088,2191,1853],{"class":1122},[1088,2193,2195],{"class":1090,"line":2194},51,[1088,2196,1949],{"class":1122},[1088,2198,2200],{"class":1090,"line":2199},52,[1088,2201,1955],{"class":1122},[1088,2203,2205],{"class":1090,"line":2204},53,[1088,2206,2207],{"class":1122}," ]\n",[1073,2209,2211],{"id":2210},"common-migration-scenarios","Common Migration Scenarios",[1078,2213,2215],{"className":1080,"code":2214,"language":1082,"meta":1083,"style":1083},"# Adding a field\nclass Post(models.Model):\n title = models.CharField(max_length=200)\n content = models.TextField()\n category = models.ForeignKey(Category, on_delete=models.CASCADE)\n # New field added\n author = models.ForeignKey(User, on_delete=models.CASCADE, null=True)\n created_at = models.DateTimeField(auto_now_add=True)\n\n# Generated migration: 0002_post_author.py\nclass Migration(migrations.Migration):\n dependencies = [\n ('auth', '0012_alter_user_first_name_max_length'),\n ('blog', '0001_initial'),\n ]\n \n operations = [\n migrations.AddField(\n model_name='post',\n name='author',\n field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.CASCADE, to='auth.user'),\n ),\n ]\n\n# Removing a field\nclass Post(models.Model):\n title = models.CharField(max_length=200)\n content = models.TextField()\n category = models.ForeignKey(Category, on_delete=models.CASCADE)\n author = models.ForeignKey(User, on_delete=models.CASCADE)\n # removed: created_at field\n updated_at = models.DateTimeField(auto_now=True)\n\n# Generated migration: 0003_remove_post_created_at_post_updated_at.py\nclass Migration(migrations.Migration):\n dependencies = [\n ('blog', '0002_post_author'),\n ]\n \n operations = [\n migrations.RemoveField(\n model_name='post',\n name='created_at',\n ),\n migrations.AddField(\n model_name='post',\n name='updated_at',\n field=models.DateTimeField(auto_now=True, default=django.utils.timezone.now),\n preserve_default=False,\n ),\n ]\n\n# Changing field properties\nclass Post(models.Model):\n # Changed max_length from 200 to 300\n title = models.CharField(max_length=300)\n content = models.TextField()\n category = models.ForeignKey(Category, on_delete=models.CASCADE)\n author = models.ForeignKey(User, on_delete=models.CASCADE)\n updated_at = models.DateTimeField(auto_now=True)\n\n# Generated migration: 0004_alter_post_title.py\nclass Migration(migrations.Migration):\n dependencies = [\n ('blog', '0003_remove_post_created_at_post_updated_at'),\n ]\n \n operations = [\n migrations.AlterField(\n model_name='post',\n name='title',\n field=models.CharField(max_length=300),\n ),\n ]\n",[1085,2216,2217,2222,2238,2260,2274,2304,2309,2348,2370,2374,2379,2395,2403,2428,2450,2454,2458,2466,2477,2493,2508,2569,2573,2577,2581,2586,2602,2624,2638,2668,2698,2703,2727,2731,2736,2752,2760,2781,2785,2789,2797,2808,2822,2836,2840,2850,2864,2879,2925,2936,2940,2944,2948,2953,2970,2976,3000,3015,3046,3077,3100,3105,3111,3128,3137,3159,3164,3169,3178,3190,3205,3220,3243,3248],{"__ignoreMap":1083},[1088,2218,2219],{"class":1090,"line":1091},[1088,2220,2221],{"class":1094},"# Adding a field\n",[1088,2223,2224,2226,2228,2230,2232,2234,2236],{"class":1090,"line":1098},[1088,2225,1115],{"class":1114},[1088,2227,1119],{"class":1118},[1088,2229,1123],{"class":1122},[1088,2231,1127],{"class":1126},[1088,2233,1130],{"class":1122},[1088,2235,1133],{"class":1126},[1088,2237,1136],{"class":1122},[1088,2239,2240,2242,2244,2246,2248,2250,2252,2254,2256,2258],{"class":1090,"line":1105},[1088,2241,1143],{"class":1142},[1088,2243,1146],{"class":1122},[1088,2245,1149],{"class":1142},[1088,2247,1130],{"class":1122},[1088,2249,1155],{"class":1154},[1088,2251,1123],{"class":1122},[1088,2253,1161],{"class":1160},[1088,2255,1146],{"class":1122},[1088,2257,1167],{"class":1166},[1088,2259,1170],{"class":1122},[1088,2261,2262,2264,2266,2268,2270,2272],{"class":1090,"line":1111},[1088,2263,1176],{"class":1142},[1088,2265,1146],{"class":1122},[1088,2267,1149],{"class":1142},[1088,2269,1130],{"class":1122},[1088,2271,1185],{"class":1154},[1088,2273,1188],{"class":1122},[1088,2275,2276,2278,2280,2282,2284,2286,2288,2290,2292,2294,2296,2298,2300,2302],{"class":1090,"line":1139},[1088,2277,1532],{"class":1142},[1088,2279,1146],{"class":1122},[1088,2281,1149],{"class":1142},[1088,2283,1130],{"class":1122},[1088,2285,1209],{"class":1154},[1088,2287,1123],{"class":1122},[1088,2289,1545],{"class":1154},[1088,2291,1217],{"class":1122},[1088,2293,1220],{"class":1160},[1088,2295,1146],{"class":1122},[1088,2297,1127],{"class":1154},[1088,2299,1130],{"class":1122},[1088,2301,1230],{"class":1229},[1088,2303,1170],{"class":1122},[1088,2305,2306],{"class":1090,"line":1173},[1088,2307,2308],{"class":1094}," # New field added\n",[1088,2310,2311,2313,2315,2317,2319,2321,2323,2325,2327,2329,2331,2333,2335,2337,2339,2342,2344,2346],{"class":1090,"line":1191},[1088,2312,1200],{"class":1142},[1088,2314,1146],{"class":1122},[1088,2316,1149],{"class":1142},[1088,2318,1130],{"class":1122},[1088,2320,1209],{"class":1154},[1088,2322,1123],{"class":1122},[1088,2324,1214],{"class":1154},[1088,2326,1217],{"class":1122},[1088,2328,1220],{"class":1160},[1088,2330,1146],{"class":1122},[1088,2332,1127],{"class":1154},[1088,2334,1130],{"class":1122},[1088,2336,1230],{"class":1229},[1088,2338,1217],{"class":1122},[1088,2340,2341],{"class":1160}," null",[1088,2343,1146],{"class":1122},[1088,2345,1407],{"class":1406},[1088,2347,1170],{"class":1122},[1088,2349,2350,2352,2354,2356,2358,2360,2362,2364,2366,2368],{"class":1090,"line":1197},[1088,2351,1414],{"class":1142},[1088,2353,1146],{"class":1122},[1088,2355,1149],{"class":1142},[1088,2357,1130],{"class":1122},[1088,2359,1423],{"class":1154},[1088,2361,1123],{"class":1122},[1088,2363,1428],{"class":1160},[1088,2365,1146],{"class":1122},[1088,2367,1407],{"class":1406},[1088,2369,1170],{"class":1122},[1088,2371,2372],{"class":1090,"line":1235},[1088,2373,1102],{"emptyLinePlaceholder":1101},[1088,2375,2376],{"class":1090,"line":1240},[1088,2377,2378],{"class":1094},"# Generated migration: 0002_post_author.py\n",[1088,2380,2381,2383,2385,2387,2389,2391,2393],{"class":1090,"line":1246},[1088,2382,1115],{"class":1114},[1088,2384,1689],{"class":1118},[1088,2386,1123],{"class":1122},[1088,2388,1024],{"class":1126},[1088,2390,1130],{"class":1122},[1088,2392,1698],{"class":1126},[1088,2394,1136],{"class":1122},[1088,2396,2397,2399,2401],{"class":1090,"line":1252},[1088,2398,1722],{"class":1142},[1088,2400,1146],{"class":1122},[1088,2402,1743],{"class":1122},[1088,2404,2405,2408,2410,2413,2415,2417,2420,2423,2425],{"class":1090,"line":1257},[1088,2406,2407],{"class":1122}," (",[1088,2409,1769],{"class":1768},[1088,2411,2412],{"class":1772},"auth",[1088,2414,1769],{"class":1768},[1088,2416,1217],{"class":1122},[1088,2418,2419],{"class":1768}," '",[1088,2421,2422],{"class":1772},"0012_alter_user_first_name_max_length",[1088,2424,1769],{"class":1768},[1088,2426,2427],{"class":1122},"),\n",[1088,2429,2430,2432,2434,2437,2439,2441,2443,2446,2448],{"class":1090,"line":1263},[1088,2431,2407],{"class":1122},[1088,2433,1769],{"class":1768},[1088,2435,2436],{"class":1772},"blog",[1088,2438,1769],{"class":1768},[1088,2440,1217],{"class":1122},[1088,2442,2419],{"class":1768},[1088,2444,2445],{"class":1772},"0001_initial",[1088,2447,1769],{"class":1768},[1088,2449,2427],{"class":1122},[1088,2451,2452],{"class":1090,"line":1269},[1088,2453,2207],{"class":1122},[1088,2455,2456],{"class":1090,"line":1274},[1088,2457,1439],{"class":1142},[1088,2459,2460,2462,2464],{"class":1090,"line":1280},[1088,2461,1738],{"class":1142},[1088,2463,1146],{"class":1122},[1088,2465,1743],{"class":1122},[1088,2467,2468,2470,2472,2475],{"class":1090,"line":1286},[1088,2469,1749],{"class":1142},[1088,2471,1130],{"class":1122},[1088,2473,2474],{"class":1154},"AddField",[1088,2476,1757],{"class":1122},[1088,2478,2479,2482,2484,2486,2489,2491],{"class":1090,"line":1291},[1088,2480,2481],{"class":1160}," model_name",[1088,2483,1146],{"class":1122},[1088,2485,1769],{"class":1768},[1088,2487,2488],{"class":1772},"post",[1088,2490,1769],{"class":1768},[1088,2492,1777],{"class":1122},[1088,2494,2495,2497,2499,2501,2504,2506],{"class":1090,"line":1297},[1088,2496,1763],{"class":1160},[1088,2498,1146],{"class":1122},[1088,2500,1769],{"class":1768},[1088,2502,2503],{"class":1772},"author",[1088,2505,1769],{"class":1768},[1088,2507,1777],{"class":1122},[1088,2509,2510,2513,2515,2517,2519,2521,2523,2526,2528,2530,2532,2534,2536,2538,2540,2542,2544,2546,2548,2550,2552,2554,2556,2558,2560,2562,2565,2567],{"class":1090,"line":1615},[1088,2511,2512],{"class":1160}," field",[1088,2514,1146],{"class":1122},[1088,2516,1127],{"class":1154},[1088,2518,1130],{"class":1122},[1088,2520,1209],{"class":1154},[1088,2522,1123],{"class":1122},[1088,2524,2525],{"class":1160},"null",[1088,2527,1146],{"class":1122},[1088,2529,1407],{"class":1406},[1088,2531,1217],{"class":1122},[1088,2533,1220],{"class":1160},[1088,2535,1146],{"class":1122},[1088,2537,2158],{"class":1154},[1088,2539,1130],{"class":1122},[1088,2541,1667],{"class":1470},[1088,2543,1130],{"class":1122},[1088,2545,1127],{"class":1470},[1088,2547,1130],{"class":1122},[1088,2549,2171],{"class":1470},[1088,2551,1130],{"class":1122},[1088,2553,1230],{"class":1229},[1088,2555,1217],{"class":1122},[1088,2557,2180],{"class":1160},[1088,2559,1146],{"class":1122},[1088,2561,1769],{"class":1768},[1088,2563,2564],{"class":1772},"auth.user",[1088,2566,1769],{"class":1768},[1088,2568,2427],{"class":1122},[1088,2570,2571],{"class":1090,"line":1621},[1088,2572,1955],{"class":1122},[1088,2574,2575],{"class":1090,"line":1627},[1088,2576,2207],{"class":1122},[1088,2578,2579],{"class":1090,"line":1632},[1088,2580,1102],{"emptyLinePlaceholder":1101},[1088,2582,2583],{"class":1090,"line":1638},[1088,2584,2585],{"class":1094},"# Removing a field\n",[1088,2587,2588,2590,2592,2594,2596,2598,2600],{"class":1090,"line":1658},[1088,2589,1115],{"class":1114},[1088,2591,1119],{"class":1118},[1088,2593,1123],{"class":1122},[1088,2595,1127],{"class":1126},[1088,2597,1130],{"class":1122},[1088,2599,1133],{"class":1126},[1088,2601,1136],{"class":1122},[1088,2603,2604,2606,2608,2610,2612,2614,2616,2618,2620,2622],{"class":1090,"line":1679},[1088,2605,1143],{"class":1142},[1088,2607,1146],{"class":1122},[1088,2609,1149],{"class":1142},[1088,2611,1130],{"class":1122},[1088,2613,1155],{"class":1154},[1088,2615,1123],{"class":1122},[1088,2617,1161],{"class":1160},[1088,2619,1146],{"class":1122},[1088,2621,1167],{"class":1166},[1088,2623,1170],{"class":1122},[1088,2625,2626,2628,2630,2632,2634,2636],{"class":1090,"line":1684},[1088,2627,1176],{"class":1142},[1088,2629,1146],{"class":1122},[1088,2631,1149],{"class":1142},[1088,2633,1130],{"class":1122},[1088,2635,1185],{"class":1154},[1088,2637,1188],{"class":1122},[1088,2639,2640,2642,2644,2646,2648,2650,2652,2654,2656,2658,2660,2662,2664,2666],{"class":1090,"line":1703},[1088,2641,1532],{"class":1142},[1088,2643,1146],{"class":1122},[1088,2645,1149],{"class":1142},[1088,2647,1130],{"class":1122},[1088,2649,1209],{"class":1154},[1088,2651,1123],{"class":1122},[1088,2653,1545],{"class":1154},[1088,2655,1217],{"class":1122},[1088,2657,1220],{"class":1160},[1088,2659,1146],{"class":1122},[1088,2661,1127],{"class":1154},[1088,2663,1130],{"class":1122},[1088,2665,1230],{"class":1229},[1088,2667,1170],{"class":1122},[1088,2669,2670,2672,2674,2676,2678,2680,2682,2684,2686,2688,2690,2692,2694,2696],{"class":1090,"line":1714},[1088,2671,1200],{"class":1142},[1088,2673,1146],{"class":1122},[1088,2675,1149],{"class":1142},[1088,2677,1130],{"class":1122},[1088,2679,1209],{"class":1154},[1088,2681,1123],{"class":1122},[1088,2683,1214],{"class":1154},[1088,2685,1217],{"class":1122},[1088,2687,1220],{"class":1160},[1088,2689,1146],{"class":1122},[1088,2691,1127],{"class":1154},[1088,2693,1130],{"class":1122},[1088,2695,1230],{"class":1229},[1088,2697,1170],{"class":1122},[1088,2699,2700],{"class":1090,"line":1719},[1088,2701,2702],{"class":1094}," # removed: created_at field\n",[1088,2704,2705,2708,2710,2712,2714,2716,2718,2721,2723,2725],{"class":1090,"line":1730},[1088,2706,2707],{"class":1142}," updated_at ",[1088,2709,1146],{"class":1122},[1088,2711,1149],{"class":1142},[1088,2713,1130],{"class":1122},[1088,2715,1423],{"class":1154},[1088,2717,1123],{"class":1122},[1088,2719,2720],{"class":1160},"auto_now",[1088,2722,1146],{"class":1122},[1088,2724,1407],{"class":1406},[1088,2726,1170],{"class":1122},[1088,2728,2729],{"class":1090,"line":1735},[1088,2730,1102],{"emptyLinePlaceholder":1101},[1088,2732,2733],{"class":1090,"line":1746},[1088,2734,2735],{"class":1094},"# Generated migration: 0003_remove_post_created_at_post_updated_at.py\n",[1088,2737,2738,2740,2742,2744,2746,2748,2750],{"class":1090,"line":1760},[1088,2739,1115],{"class":1114},[1088,2741,1689],{"class":1118},[1088,2743,1123],{"class":1122},[1088,2745,1024],{"class":1126},[1088,2747,1130],{"class":1122},[1088,2749,1698],{"class":1126},[1088,2751,1136],{"class":1122},[1088,2753,2754,2756,2758],{"class":1090,"line":1780},[1088,2755,1722],{"class":1142},[1088,2757,1146],{"class":1122},[1088,2759,1743],{"class":1122},[1088,2761,2762,2764,2766,2768,2770,2772,2774,2777,2779],{"class":1090,"line":1789},[1088,2763,2407],{"class":1122},[1088,2765,1769],{"class":1768},[1088,2767,2436],{"class":1772},[1088,2769,1769],{"class":1768},[1088,2771,1217],{"class":1122},[1088,2773,2419],{"class":1768},[1088,2775,2776],{"class":1772},"0002_post_author",[1088,2778,1769],{"class":1768},[1088,2780,2427],{"class":1122},[1088,2782,2783],{"class":1090,"line":1856},[1088,2784,2207],{"class":1122},[1088,2786,2787],{"class":1090,"line":1886},[1088,2788,1439],{"class":1142},[1088,2790,2791,2793,2795],{"class":1090,"line":1916},[1088,2792,1738],{"class":1142},[1088,2794,1146],{"class":1122},[1088,2796,1743],{"class":1122},[1088,2798,2799,2801,2803,2806],{"class":1090,"line":1946},[1088,2800,1749],{"class":1142},[1088,2802,1130],{"class":1122},[1088,2804,2805],{"class":1154},"RemoveField",[1088,2807,1757],{"class":1122},[1088,2809,2810,2812,2814,2816,2818,2820],{"class":1090,"line":1952},[1088,2811,2481],{"class":1160},[1088,2813,1146],{"class":1122},[1088,2815,1769],{"class":1768},[1088,2817,2488],{"class":1772},[1088,2819,1769],{"class":1768},[1088,2821,1777],{"class":1122},[1088,2823,2824,2826,2828,2830,2832,2834],{"class":1090,"line":1958},[1088,2825,1763],{"class":1160},[1088,2827,1146],{"class":1122},[1088,2829,1769],{"class":1768},[1088,2831,1923],{"class":1772},[1088,2833,1769],{"class":1768},[1088,2835,1777],{"class":1122},[1088,2837,2838],{"class":1090,"line":1969},[1088,2839,1955],{"class":1122},[1088,2841,2842,2844,2846,2848],{"class":1090,"line":1985},[1088,2843,1749],{"class":1142},[1088,2845,1130],{"class":1122},[1088,2847,2474],{"class":1154},[1088,2849,1757],{"class":1122},[1088,2851,2852,2854,2856,2858,2860,2862],{"class":1090,"line":1992},[1088,2853,2481],{"class":1160},[1088,2855,1146],{"class":1122},[1088,2857,1769],{"class":1768},[1088,2859,2488],{"class":1772},[1088,2861,1769],{"class":1768},[1088,2863,1777],{"class":1122},[1088,2865,2866,2868,2870,2872,2875,2877],{"class":1090,"line":2049},[1088,2867,1763],{"class":1160},[1088,2869,1146],{"class":1122},[1088,2871,1769],{"class":1768},[1088,2873,2874],{"class":1772},"updated_at",[1088,2876,1769],{"class":1768},[1088,2878,1777],{"class":1122},[1088,2880,2881,2883,2885,2887,2889,2891,2893,2895,2897,2899,2901,2904,2906,2908,2910,2913,2915,2918,2920,2923],{"class":1090,"line":2079},[1088,2882,2512],{"class":1160},[1088,2884,1146],{"class":1122},[1088,2886,1127],{"class":1154},[1088,2888,1130],{"class":1122},[1088,2890,1423],{"class":1154},[1088,2892,1123],{"class":1122},[1088,2894,2720],{"class":1160},[1088,2896,1146],{"class":1122},[1088,2898,1407],{"class":1406},[1088,2900,1217],{"class":1122},[1088,2902,2903],{"class":1160}," default",[1088,2905,1146],{"class":1122},[1088,2907,2158],{"class":1154},[1088,2909,1130],{"class":1122},[1088,2911,2912],{"class":1470},"utils",[1088,2914,1130],{"class":1122},[1088,2916,2917],{"class":1470},"timezone",[1088,2919,1130],{"class":1122},[1088,2921,2922],{"class":1470},"now",[1088,2924,2427],{"class":1122},[1088,2926,2927,2930,2932,2934],{"class":1090,"line":2102},[1088,2928,2929],{"class":1160}," preserve_default",[1088,2931,1146],{"class":1122},[1088,2933,1836],{"class":1406},[1088,2935,1777],{"class":1122},[1088,2937,2938],{"class":1090,"line":2131},[1088,2939,1955],{"class":1122},[1088,2941,2942],{"class":1090,"line":2194},[1088,2943,2207],{"class":1122},[1088,2945,2946],{"class":1090,"line":2199},[1088,2947,1102],{"emptyLinePlaceholder":1101},[1088,2949,2950],{"class":1090,"line":2204},[1088,2951,2952],{"class":1094},"# Changing field properties\n",[1088,2954,2956,2958,2960,2962,2964,2966,2968],{"class":1090,"line":2955},54,[1088,2957,1115],{"class":1114},[1088,2959,1119],{"class":1118},[1088,2961,1123],{"class":1122},[1088,2963,1127],{"class":1126},[1088,2965,1130],{"class":1122},[1088,2967,1133],{"class":1126},[1088,2969,1136],{"class":1122},[1088,2971,2973],{"class":1090,"line":2972},55,[1088,2974,2975],{"class":1094}," # Changed max_length from 200 to 300\n",[1088,2977,2979,2981,2983,2985,2987,2989,2991,2993,2995,2998],{"class":1090,"line":2978},56,[1088,2980,1143],{"class":1142},[1088,2982,1146],{"class":1122},[1088,2984,1149],{"class":1142},[1088,2986,1130],{"class":1122},[1088,2988,1155],{"class":1154},[1088,2990,1123],{"class":1122},[1088,2992,1161],{"class":1160},[1088,2994,1146],{"class":1122},[1088,2996,2997],{"class":1166},"300",[1088,2999,1170],{"class":1122},[1088,3001,3003,3005,3007,3009,3011,3013],{"class":1090,"line":3002},57,[1088,3004,1176],{"class":1142},[1088,3006,1146],{"class":1122},[1088,3008,1149],{"class":1142},[1088,3010,1130],{"class":1122},[1088,3012,1185],{"class":1154},[1088,3014,1188],{"class":1122},[1088,3016,3018,3020,3022,3024,3026,3028,3030,3032,3034,3036,3038,3040,3042,3044],{"class":1090,"line":3017},58,[1088,3019,1532],{"class":1142},[1088,3021,1146],{"class":1122},[1088,3023,1149],{"class":1142},[1088,3025,1130],{"class":1122},[1088,3027,1209],{"class":1154},[1088,3029,1123],{"class":1122},[1088,3031,1545],{"class":1154},[1088,3033,1217],{"class":1122},[1088,3035,1220],{"class":1160},[1088,3037,1146],{"class":1122},[1088,3039,1127],{"class":1154},[1088,3041,1130],{"class":1122},[1088,3043,1230],{"class":1229},[1088,3045,1170],{"class":1122},[1088,3047,3049,3051,3053,3055,3057,3059,3061,3063,3065,3067,3069,3071,3073,3075],{"class":1090,"line":3048},59,[1088,3050,1200],{"class":1142},[1088,3052,1146],{"class":1122},[1088,3054,1149],{"class":1142},[1088,3056,1130],{"class":1122},[1088,3058,1209],{"class":1154},[1088,3060,1123],{"class":1122},[1088,3062,1214],{"class":1154},[1088,3064,1217],{"class":1122},[1088,3066,1220],{"class":1160},[1088,3068,1146],{"class":1122},[1088,3070,1127],{"class":1154},[1088,3072,1130],{"class":1122},[1088,3074,1230],{"class":1229},[1088,3076,1170],{"class":1122},[1088,3078,3080,3082,3084,3086,3088,3090,3092,3094,3096,3098],{"class":1090,"line":3079},60,[1088,3081,2707],{"class":1142},[1088,3083,1146],{"class":1122},[1088,3085,1149],{"class":1142},[1088,3087,1130],{"class":1122},[1088,3089,1423],{"class":1154},[1088,3091,1123],{"class":1122},[1088,3093,2720],{"class":1160},[1088,3095,1146],{"class":1122},[1088,3097,1407],{"class":1406},[1088,3099,1170],{"class":1122},[1088,3101,3103],{"class":1090,"line":3102},61,[1088,3104,1102],{"emptyLinePlaceholder":1101},[1088,3106,3108],{"class":1090,"line":3107},62,[1088,3109,3110],{"class":1094},"# Generated migration: 0004_alter_post_title.py\n",[1088,3112,3114,3116,3118,3120,3122,3124,3126],{"class":1090,"line":3113},63,[1088,3115,1115],{"class":1114},[1088,3117,1689],{"class":1118},[1088,3119,1123],{"class":1122},[1088,3121,1024],{"class":1126},[1088,3123,1130],{"class":1122},[1088,3125,1698],{"class":1126},[1088,3127,1136],{"class":1122},[1088,3129,3131,3133,3135],{"class":1090,"line":3130},64,[1088,3132,1722],{"class":1142},[1088,3134,1146],{"class":1122},[1088,3136,1743],{"class":1122},[1088,3138,3140,3142,3144,3146,3148,3150,3152,3155,3157],{"class":1090,"line":3139},65,[1088,3141,2407],{"class":1122},[1088,3143,1769],{"class":1768},[1088,3145,2436],{"class":1772},[1088,3147,1769],{"class":1768},[1088,3149,1217],{"class":1122},[1088,3151,2419],{"class":1768},[1088,3153,3154],{"class":1772},"0003_remove_post_created_at_post_updated_at",[1088,3156,1769],{"class":1768},[1088,3158,2427],{"class":1122},[1088,3160,3162],{"class":1090,"line":3161},66,[1088,3163,2207],{"class":1122},[1088,3165,3167],{"class":1090,"line":3166},67,[1088,3168,1439],{"class":1142},[1088,3170,3172,3174,3176],{"class":1090,"line":3171},68,[1088,3173,1738],{"class":1142},[1088,3175,1146],{"class":1122},[1088,3177,1743],{"class":1122},[1088,3179,3181,3183,3185,3188],{"class":1090,"line":3180},69,[1088,3182,1749],{"class":1142},[1088,3184,1130],{"class":1122},[1088,3186,3187],{"class":1154},"AlterField",[1088,3189,1757],{"class":1122},[1088,3191,3193,3195,3197,3199,3201,3203],{"class":1090,"line":3192},70,[1088,3194,2481],{"class":1160},[1088,3196,1146],{"class":1122},[1088,3198,1769],{"class":1768},[1088,3200,2488],{"class":1772},[1088,3202,1769],{"class":1768},[1088,3204,1777],{"class":1122},[1088,3206,3208,3210,3212,3214,3216,3218],{"class":1090,"line":3207},71,[1088,3209,1763],{"class":1160},[1088,3211,1146],{"class":1122},[1088,3213,1769],{"class":1768},[1088,3215,2056],{"class":1772},[1088,3217,1769],{"class":1768},[1088,3219,1777],{"class":1122},[1088,3221,3223,3225,3227,3229,3231,3233,3235,3237,3239,3241],{"class":1090,"line":3222},72,[1088,3224,2512],{"class":1160},[1088,3226,1146],{"class":1122},[1088,3228,1127],{"class":1154},[1088,3230,1130],{"class":1122},[1088,3232,1155],{"class":1154},[1088,3234,1123],{"class":1122},[1088,3236,1161],{"class":1160},[1088,3238,1146],{"class":1122},[1088,3240,2997],{"class":1166},[1088,3242,2427],{"class":1122},[1088,3244,3246],{"class":1090,"line":3245},73,[1088,3247,1955],{"class":1122},[1088,3249,3251],{"class":1090,"line":3250},74,[1088,3252,2207],{"class":1122},[1030,3254,3256],{"id":3255},"migration-commands","Migration Commands",[1073,3258,3260],{"id":3259},"essential-migration-commands","Essential Migration Commands",[1078,3262,3266],{"className":3263,"code":3264,"language":3265,"meta":1083,"style":1083},"language-bash shiki shiki-themes material-theme-lighter vitesse-light vitesse-dark","# Create migrations for model changes\npython manage.py makemigrations\n\n# Create migrations for specific app\npython manage.py makemigrations blog\n\n# Create empty migration for custom operations\npython manage.py makemigrations --empty blog\n\n# Apply migrations\npython manage.py migrate\n\n# Apply migrations for specific app\npython manage.py migrate blog\n\n# Apply migrations up to specific migration\npython manage.py migrate blog 0003\n\n# Show migration status\npython manage.py showmigrations\n\n# Show migration status for specific app\npython manage.py showmigrations blog\n\n# Show SQL for a migration without applying\npython manage.py sqlmigrate blog 0001\n\n# Check for migration issues\npython manage.py check\n\n# Reverse migrations (go back to previous state)\npython manage.py migrate blog 0002\n\n# Completely unapply all migrations for an app\npython manage.py migrate blog zero\n","bash",[1085,3267,3268,3273,3283,3287,3292,3304,3308,3313,3327,3331,3336,3345,3349,3354,3365,3369,3374,3388,3392,3397,3406,3410,3415,3426,3430,3435,3449,3453,3458,3467,3471,3476,3489,3493,3498],{"__ignoreMap":1083},[1088,3269,3270],{"class":1090,"line":1091},[1088,3271,3272],{"class":1094},"# Create migrations for model changes\n",[1088,3274,3275,3277,3280],{"class":1090,"line":1098},[1088,3276,1082],{"class":1126},[1088,3278,3279],{"class":1772}," manage.py",[1088,3281,3282],{"class":1772}," makemigrations\n",[1088,3284,3285],{"class":1090,"line":1105},[1088,3286,1102],{"emptyLinePlaceholder":1101},[1088,3288,3289],{"class":1090,"line":1111},[1088,3290,3291],{"class":1094},"# Create migrations for specific app\n",[1088,3293,3294,3296,3298,3301],{"class":1090,"line":1139},[1088,3295,1082],{"class":1126},[1088,3297,3279],{"class":1772},[1088,3299,3300],{"class":1772}," makemigrations",[1088,3302,3303],{"class":1772}," blog\n",[1088,3305,3306],{"class":1090,"line":1173},[1088,3307,1102],{"emptyLinePlaceholder":1101},[1088,3309,3310],{"class":1090,"line":1191},[1088,3311,3312],{"class":1094},"# Create empty migration for custom operations\n",[1088,3314,3315,3317,3319,3321,3325],{"class":1090,"line":1197},[1088,3316,1082],{"class":1126},[1088,3318,3279],{"class":1772},[1088,3320,3300],{"class":1772},[1088,3322,3324],{"class":3323},"sz9Cv"," --empty",[1088,3326,3303],{"class":1772},[1088,3328,3329],{"class":1090,"line":1235},[1088,3330,1102],{"emptyLinePlaceholder":1101},[1088,3332,3333],{"class":1090,"line":1240},[1088,3334,3335],{"class":1094},"# Apply migrations\n",[1088,3337,3338,3340,3342],{"class":1090,"line":1246},[1088,3339,1082],{"class":1126},[1088,3341,3279],{"class":1772},[1088,3343,3344],{"class":1772}," migrate\n",[1088,3346,3347],{"class":1090,"line":1252},[1088,3348,1102],{"emptyLinePlaceholder":1101},[1088,3350,3351],{"class":1090,"line":1257},[1088,3352,3353],{"class":1094},"# Apply migrations for specific app\n",[1088,3355,3356,3358,3360,3363],{"class":1090,"line":1263},[1088,3357,1082],{"class":1126},[1088,3359,3279],{"class":1772},[1088,3361,3362],{"class":1772}," migrate",[1088,3364,3303],{"class":1772},[1088,3366,3367],{"class":1090,"line":1269},[1088,3368,1102],{"emptyLinePlaceholder":1101},[1088,3370,3371],{"class":1090,"line":1274},[1088,3372,3373],{"class":1094},"# Apply migrations up to specific migration\n",[1088,3375,3376,3378,3380,3382,3385],{"class":1090,"line":1280},[1088,3377,1082],{"class":1126},[1088,3379,3279],{"class":1772},[1088,3381,3362],{"class":1772},[1088,3383,3384],{"class":1772}," blog",[1088,3386,3387],{"class":1166}," 0003\n",[1088,3389,3390],{"class":1090,"line":1286},[1088,3391,1102],{"emptyLinePlaceholder":1101},[1088,3393,3394],{"class":1090,"line":1291},[1088,3395,3396],{"class":1094},"# Show migration status\n",[1088,3398,3399,3401,3403],{"class":1090,"line":1297},[1088,3400,1082],{"class":1126},[1088,3402,3279],{"class":1772},[1088,3404,3405],{"class":1772}," showmigrations\n",[1088,3407,3408],{"class":1090,"line":1615},[1088,3409,1102],{"emptyLinePlaceholder":1101},[1088,3411,3412],{"class":1090,"line":1621},[1088,3413,3414],{"class":1094},"# Show migration status for specific app\n",[1088,3416,3417,3419,3421,3424],{"class":1090,"line":1627},[1088,3418,1082],{"class":1126},[1088,3420,3279],{"class":1772},[1088,3422,3423],{"class":1772}," showmigrations",[1088,3425,3303],{"class":1772},[1088,3427,3428],{"class":1090,"line":1632},[1088,3429,1102],{"emptyLinePlaceholder":1101},[1088,3431,3432],{"class":1090,"line":1638},[1088,3433,3434],{"class":1094},"# Show SQL for a migration without applying\n",[1088,3436,3437,3439,3441,3444,3446],{"class":1090,"line":1658},[1088,3438,1082],{"class":1126},[1088,3440,3279],{"class":1772},[1088,3442,3443],{"class":1772}," sqlmigrate",[1088,3445,3384],{"class":1772},[1088,3447,3448],{"class":1166}," 0001\n",[1088,3450,3451],{"class":1090,"line":1679},[1088,3452,1102],{"emptyLinePlaceholder":1101},[1088,3454,3455],{"class":1090,"line":1684},[1088,3456,3457],{"class":1094},"# Check for migration issues\n",[1088,3459,3460,3462,3464],{"class":1090,"line":1703},[1088,3461,1082],{"class":1126},[1088,3463,3279],{"class":1772},[1088,3465,3466],{"class":1772}," check\n",[1088,3468,3469],{"class":1090,"line":1714},[1088,3470,1102],{"emptyLinePlaceholder":1101},[1088,3472,3473],{"class":1090,"line":1719},[1088,3474,3475],{"class":1094},"# Reverse migrations (go back to previous state)\n",[1088,3477,3478,3480,3482,3484,3486],{"class":1090,"line":1730},[1088,3479,1082],{"class":1126},[1088,3481,3279],{"class":1772},[1088,3483,3362],{"class":1772},[1088,3485,3384],{"class":1772},[1088,3487,3488],{"class":1166}," 0002\n",[1088,3490,3491],{"class":1090,"line":1735},[1088,3492,1102],{"emptyLinePlaceholder":1101},[1088,3494,3495],{"class":1090,"line":1746},[1088,3496,3497],{"class":1094},"# Completely unapply all migrations for an app\n",[1088,3499,3500,3502,3504,3506,3508],{"class":1090,"line":1760},[1088,3501,1082],{"class":1126},[1088,3503,3279],{"class":1772},[1088,3505,3362],{"class":1772},[1088,3507,3384],{"class":1772},[1088,3509,3510],{"class":1772}," zero\n",[1073,3512,3514],{"id":3513},"migration-planning-and-review","Migration Planning and Review",[1078,3516,3518],{"className":1080,"code":3517,"language":1082,"meta":1083,"style":1083},"# Always review generated migrations before applying\n# Example migration review checklist:\n\nclass MigrationReviewChecklist:\n \"\"\"\n Migration Review Checklist:\n \n 1. Data Safety\n - Will this migration cause data loss?\n - Are there adequate default values for new NOT NULL fields?\n - Is there a rollback plan?\n \n 2. Performance Impact\n - Will this migration lock tables for a long time?\n - Are there indexes being created that might slow down the migration?\n - Should this be done during maintenance windows?\n \n 3. Dependencies\n - Are all required dependencies listed?\n - Will this migration conflict with other pending migrations?\n - Are there circular dependencies?\n \n 4. Backwards Compatibility\n - Can this migration be safely reversed?\n - Will reversing this migration cause data loss?\n - Are there any irreversible operations?\n \n 5. Production Considerations\n - Is this migration safe to run on production data?\n - Should this be split into multiple smaller migrations?\n - Are there any manual steps required before or after?\n \"\"\"\n pass\n\n# Example of a complex migration that needs careful review\nclass Migration(migrations.Migration):\n dependencies = [\n ('blog', '0004_alter_post_title'),\n ]\n \n operations = [\n # This operation might be slow on large tables\n migrations.AddField(\n model_name='post',\n name='slug',\n field=models.SlugField(max_length=300, unique=True, default=''),\n preserve_default=False,\n ),\n \n # This will create an index, which might take time\n migrations.AlterField(\n model_name='post',\n name='title',\n field=models.CharField(max_length=300, db_index=True),\n ),\n \n # Custom operation to populate slug field\n migrations.RunPython(\n code=populate_post_slugs,\n reverse_code=migrations.RunPython.noop,\n ),\n ]\n\ndef populate_post_slugs(apps, schema_editor):\n \"\"\"Populate slug field for existing posts\"\"\"\n Post = apps.get_model('blog', 'Post')\n from django.utils.text import slugify\n \n for post in Post.objects.all():\n post.slug = slugify(post.title)\n post.save()\n",[1085,3519,3520,3525,3530,3534,3544,3550,3556,3560,3565,3570,3575,3580,3584,3589,3594,3599,3604,3608,3613,3618,3623,3628,3632,3637,3642,3647,3652,3656,3661,3666,3671,3676,3680,3685,3689,3694,3710,3718,3739,3743,3747,3755,3760,3770,3784,3799,3840,3850,3854,3859,3864,3874,3888,3902,3933,3937,3941,3946,3957,3969,3989,3993,3997,4001,4023,4034,4067,4088,4092,4118,4143],{"__ignoreMap":1083},[1088,3521,3522],{"class":1090,"line":1091},[1088,3523,3524],{"class":1094},"# Always review generated migrations before applying\n",[1088,3526,3527],{"class":1090,"line":1098},[1088,3528,3529],{"class":1094},"# Example migration review checklist:\n",[1088,3531,3532],{"class":1090,"line":1105},[1088,3533,1102],{"emptyLinePlaceholder":1101},[1088,3535,3536,3538,3541],{"class":1090,"line":1111},[1088,3537,1115],{"class":1114},[1088,3539,3540],{"class":1118}," MigrationReviewChecklist",[1088,3542,3543],{"class":1122},":\n",[1088,3545,3546],{"class":1090,"line":1139},[1088,3547,3549],{"class":3548},"sm7ve"," \"\"\"\n",[1088,3551,3552],{"class":1090,"line":1173},[1088,3553,3555],{"class":3554},"sVyVU"," Migration Review Checklist:\n",[1088,3557,3558],{"class":1090,"line":1191},[1088,3559,1439],{"class":3554},[1088,3561,3562],{"class":1090,"line":1197},[1088,3563,3564],{"class":3554}," 1. Data Safety\n",[1088,3566,3567],{"class":1090,"line":1235},[1088,3568,3569],{"class":3554}," - Will this migration cause data loss?\n",[1088,3571,3572],{"class":1090,"line":1240},[1088,3573,3574],{"class":3554}," - Are there adequate default values for new NOT NULL fields?\n",[1088,3576,3577],{"class":1090,"line":1246},[1088,3578,3579],{"class":3554}," - Is there a rollback plan?\n",[1088,3581,3582],{"class":1090,"line":1252},[1088,3583,1439],{"class":3554},[1088,3585,3586],{"class":1090,"line":1257},[1088,3587,3588],{"class":3554}," 2. Performance Impact\n",[1088,3590,3591],{"class":1090,"line":1263},[1088,3592,3593],{"class":3554}," - Will this migration lock tables for a long time?\n",[1088,3595,3596],{"class":1090,"line":1269},[1088,3597,3598],{"class":3554}," - Are there indexes being created that might slow down the migration?\n",[1088,3600,3601],{"class":1090,"line":1274},[1088,3602,3603],{"class":3554}," - Should this be done during maintenance windows?\n",[1088,3605,3606],{"class":1090,"line":1280},[1088,3607,1439],{"class":3554},[1088,3609,3610],{"class":1090,"line":1286},[1088,3611,3612],{"class":3554}," 3. Dependencies\n",[1088,3614,3615],{"class":1090,"line":1291},[1088,3616,3617],{"class":3554}," - Are all required dependencies listed?\n",[1088,3619,3620],{"class":1090,"line":1297},[1088,3621,3622],{"class":3554}," - Will this migration conflict with other pending migrations?\n",[1088,3624,3625],{"class":1090,"line":1615},[1088,3626,3627],{"class":3554}," - Are there circular dependencies?\n",[1088,3629,3630],{"class":1090,"line":1621},[1088,3631,1439],{"class":3554},[1088,3633,3634],{"class":1090,"line":1627},[1088,3635,3636],{"class":3554}," 4. Backwards Compatibility\n",[1088,3638,3639],{"class":1090,"line":1632},[1088,3640,3641],{"class":3554}," - Can this migration be safely reversed?\n",[1088,3643,3644],{"class":1090,"line":1638},[1088,3645,3646],{"class":3554}," - Will reversing this migration cause data loss?\n",[1088,3648,3649],{"class":1090,"line":1658},[1088,3650,3651],{"class":3554}," - Are there any irreversible operations?\n",[1088,3653,3654],{"class":1090,"line":1679},[1088,3655,1439],{"class":3554},[1088,3657,3658],{"class":1090,"line":1684},[1088,3659,3660],{"class":3554}," 5. Production Considerations\n",[1088,3662,3663],{"class":1090,"line":1703},[1088,3664,3665],{"class":3554}," - Is this migration safe to run on production data?\n",[1088,3667,3668],{"class":1090,"line":1714},[1088,3669,3670],{"class":3554}," - Should this be split into multiple smaller migrations?\n",[1088,3672,3673],{"class":1090,"line":1719},[1088,3674,3675],{"class":3554}," - Are there any manual steps required before or after?\n",[1088,3677,3678],{"class":1090,"line":1730},[1088,3679,3549],{"class":3548},[1088,3681,3682],{"class":1090,"line":1735},[1088,3683,3684],{"class":1323}," pass\n",[1088,3686,3687],{"class":1090,"line":1746},[1088,3688,1102],{"emptyLinePlaceholder":1101},[1088,3690,3691],{"class":1090,"line":1760},[1088,3692,3693],{"class":1094},"# Example of a complex migration that needs careful review\n",[1088,3695,3696,3698,3700,3702,3704,3706,3708],{"class":1090,"line":1780},[1088,3697,1115],{"class":1114},[1088,3699,1689],{"class":1118},[1088,3701,1123],{"class":1122},[1088,3703,1024],{"class":1126},[1088,3705,1130],{"class":1122},[1088,3707,1698],{"class":1126},[1088,3709,1136],{"class":1122},[1088,3711,3712,3714,3716],{"class":1090,"line":1789},[1088,3713,1722],{"class":1142},[1088,3715,1146],{"class":1122},[1088,3717,1743],{"class":1122},[1088,3719,3720,3722,3724,3726,3728,3730,3732,3735,3737],{"class":1090,"line":1856},[1088,3721,2407],{"class":1122},[1088,3723,1769],{"class":1768},[1088,3725,2436],{"class":1772},[1088,3727,1769],{"class":1768},[1088,3729,1217],{"class":1122},[1088,3731,2419],{"class":1768},[1088,3733,3734],{"class":1772},"0004_alter_post_title",[1088,3736,1769],{"class":1768},[1088,3738,2427],{"class":1122},[1088,3740,3741],{"class":1090,"line":1886},[1088,3742,2207],{"class":1122},[1088,3744,3745],{"class":1090,"line":1916},[1088,3746,1439],{"class":1142},[1088,3748,3749,3751,3753],{"class":1090,"line":1946},[1088,3750,1738],{"class":1142},[1088,3752,1146],{"class":1122},[1088,3754,1743],{"class":1122},[1088,3756,3757],{"class":1090,"line":1952},[1088,3758,3759],{"class":1094}," # This operation might be slow on large tables\n",[1088,3761,3762,3764,3766,3768],{"class":1090,"line":1958},[1088,3763,1749],{"class":1142},[1088,3765,1130],{"class":1122},[1088,3767,2474],{"class":1154},[1088,3769,1757],{"class":1122},[1088,3771,3772,3774,3776,3778,3780,3782],{"class":1090,"line":1969},[1088,3773,2481],{"class":1160},[1088,3775,1146],{"class":1122},[1088,3777,1769],{"class":1768},[1088,3779,2488],{"class":1772},[1088,3781,1769],{"class":1768},[1088,3783,1777],{"class":1122},[1088,3785,3786,3788,3790,3792,3795,3797],{"class":1090,"line":1985},[1088,3787,1763],{"class":1160},[1088,3789,1146],{"class":1122},[1088,3791,1769],{"class":1768},[1088,3793,3794],{"class":1772},"slug",[1088,3796,1769],{"class":1768},[1088,3798,1777],{"class":1122},[1088,3800,3801,3803,3805,3807,3809,3812,3814,3816,3818,3820,3822,3825,3827,3829,3831,3833,3835,3838],{"class":1090,"line":1992},[1088,3802,2512],{"class":1160},[1088,3804,1146],{"class":1122},[1088,3806,1127],{"class":1154},[1088,3808,1130],{"class":1122},[1088,3810,3811],{"class":1154},"SlugField",[1088,3813,1123],{"class":1122},[1088,3815,1161],{"class":1160},[1088,3817,1146],{"class":1122},[1088,3819,2997],{"class":1166},[1088,3821,1217],{"class":1122},[1088,3823,3824],{"class":1160}," unique",[1088,3826,1146],{"class":1122},[1088,3828,1407],{"class":1406},[1088,3830,1217],{"class":1122},[1088,3832,2903],{"class":1160},[1088,3834,1146],{"class":1122},[1088,3836,3837],{"class":1768},"''",[1088,3839,2427],{"class":1122},[1088,3841,3842,3844,3846,3848],{"class":1090,"line":2049},[1088,3843,2929],{"class":1160},[1088,3845,1146],{"class":1122},[1088,3847,1836],{"class":1406},[1088,3849,1777],{"class":1122},[1088,3851,3852],{"class":1090,"line":2079},[1088,3853,1955],{"class":1122},[1088,3855,3856],{"class":1090,"line":2102},[1088,3857,3858],{"class":1142}," \n",[1088,3860,3861],{"class":1090,"line":2131},[1088,3862,3863],{"class":1094}," # This will create an index, which might take time\n",[1088,3865,3866,3868,3870,3872],{"class":1090,"line":2194},[1088,3867,1749],{"class":1142},[1088,3869,1130],{"class":1122},[1088,3871,3187],{"class":1154},[1088,3873,1757],{"class":1122},[1088,3875,3876,3878,3880,3882,3884,3886],{"class":1090,"line":2199},[1088,3877,2481],{"class":1160},[1088,3879,1146],{"class":1122},[1088,3881,1769],{"class":1768},[1088,3883,2488],{"class":1772},[1088,3885,1769],{"class":1768},[1088,3887,1777],{"class":1122},[1088,3889,3890,3892,3894,3896,3898,3900],{"class":1090,"line":2204},[1088,3891,1763],{"class":1160},[1088,3893,1146],{"class":1122},[1088,3895,1769],{"class":1768},[1088,3897,2056],{"class":1772},[1088,3899,1769],{"class":1768},[1088,3901,1777],{"class":1122},[1088,3903,3904,3906,3908,3910,3912,3914,3916,3918,3920,3922,3924,3927,3929,3931],{"class":1090,"line":2955},[1088,3905,2512],{"class":1160},[1088,3907,1146],{"class":1122},[1088,3909,1127],{"class":1154},[1088,3911,1130],{"class":1122},[1088,3913,1155],{"class":1154},[1088,3915,1123],{"class":1122},[1088,3917,1161],{"class":1160},[1088,3919,1146],{"class":1122},[1088,3921,2997],{"class":1166},[1088,3923,1217],{"class":1122},[1088,3925,3926],{"class":1160}," db_index",[1088,3928,1146],{"class":1122},[1088,3930,1407],{"class":1406},[1088,3932,2427],{"class":1122},[1088,3934,3935],{"class":1090,"line":2972},[1088,3936,1955],{"class":1122},[1088,3938,3939],{"class":1090,"line":2978},[1088,3940,3858],{"class":1142},[1088,3942,3943],{"class":1090,"line":3002},[1088,3944,3945],{"class":1094}," # Custom operation to populate slug field\n",[1088,3947,3948,3950,3952,3955],{"class":1090,"line":3017},[1088,3949,1749],{"class":1142},[1088,3951,1130],{"class":1122},[1088,3953,3954],{"class":1154},"RunPython",[1088,3956,1757],{"class":1122},[1088,3958,3959,3962,3964,3967],{"class":1090,"line":3048},[1088,3960,3961],{"class":1160}," code",[1088,3963,1146],{"class":1122},[1088,3965,3966],{"class":1154},"populate_post_slugs",[1088,3968,1777],{"class":1122},[1088,3970,3971,3974,3976,3978,3980,3982,3984,3987],{"class":1090,"line":3079},[1088,3972,3973],{"class":1160}," reverse_code",[1088,3975,1146],{"class":1122},[1088,3977,1024],{"class":1154},[1088,3979,1130],{"class":1122},[1088,3981,3954],{"class":1470},[1088,3983,1130],{"class":1122},[1088,3985,3986],{"class":1470},"noop",[1088,3988,1777],{"class":1122},[1088,3990,3991],{"class":1090,"line":3102},[1088,3992,1955],{"class":1122},[1088,3994,3995],{"class":1090,"line":3107},[1088,3996,2207],{"class":1122},[1088,3998,3999],{"class":1090,"line":3113},[1088,4000,1102],{"emptyLinePlaceholder":1101},[1088,4002,4003,4006,4010,4012,4016,4018,4021],{"class":1090,"line":3130},[1088,4004,4005],{"class":1114},"def",[1088,4007,4009],{"class":4008},"sljsM"," populate_post_slugs",[1088,4011,1123],{"class":1122},[1088,4013,4015],{"class":4014},"sCyAa","apps",[1088,4017,1217],{"class":1122},[1088,4019,4020],{"class":4014}," schema_editor",[1088,4022,1136],{"class":1122},[1088,4024,4025,4028,4031],{"class":1090,"line":3139},[1088,4026,4027],{"class":3548}," \"\"\"",[1088,4029,4030],{"class":3554},"Populate slug field for existing posts",[1088,4032,4033],{"class":3548},"\"\"\"\n",[1088,4035,4036,4039,4041,4044,4046,4049,4051,4053,4055,4057,4059,4061,4063,4065],{"class":1090,"line":3161},[1088,4037,4038],{"class":1142}," Post ",[1088,4040,1146],{"class":1122},[1088,4042,4043],{"class":1142}," apps",[1088,4045,1130],{"class":1122},[1088,4047,4048],{"class":1154},"get_model",[1088,4050,1123],{"class":1122},[1088,4052,1769],{"class":1768},[1088,4054,2436],{"class":1772},[1088,4056,1769],{"class":1768},[1088,4058,1217],{"class":1122},[1088,4060,2419],{"class":1768},[1088,4062,1978],{"class":1772},[1088,4064,1769],{"class":1768},[1088,4066,1170],{"class":1122},[1088,4068,4069,4072,4074,4076,4078,4080,4083,4085],{"class":1090,"line":3166},[1088,4070,4071],{"class":1323}," from",[1088,4073,1327],{"class":1142},[1088,4075,1130],{"class":1122},[1088,4077,2912],{"class":1142},[1088,4079,1130],{"class":1122},[1088,4081,4082],{"class":1142},"text ",[1088,4084,1335],{"class":1323},[1088,4086,4087],{"class":1142}," slugify\n",[1088,4089,4090],{"class":1090,"line":3171},[1088,4091,1439],{"class":1142},[1088,4093,4094,4097,4100,4103,4105,4107,4110,4112,4115],{"class":1090,"line":3180},[1088,4095,4096],{"class":1323}," for",[1088,4098,4099],{"class":1142}," post ",[1088,4101,4102],{"class":1323},"in",[1088,4104,1119],{"class":1142},[1088,4106,1130],{"class":1122},[1088,4108,4109],{"class":1470},"objects",[1088,4111,1130],{"class":1122},[1088,4113,4114],{"class":1154},"all",[1088,4116,4117],{"class":1122},"():\n",[1088,4119,4120,4123,4125,4127,4130,4133,4135,4137,4139,4141],{"class":1090,"line":3192},[1088,4121,4122],{"class":1142}," post",[1088,4124,1130],{"class":1122},[1088,4126,3794],{"class":1470},[1088,4128,4129],{"class":1122}," =",[1088,4131,4132],{"class":1154}," slugify",[1088,4134,1123],{"class":1122},[1088,4136,2488],{"class":1154},[1088,4138,1130],{"class":1122},[1088,4140,2056],{"class":1470},[1088,4142,1170],{"class":1122},[1088,4144,4145,4147,4149,4152],{"class":1090,"line":3207},[1088,4146,4122],{"class":1142},[1088,4148,1130],{"class":1122},[1088,4150,4151],{"class":1154},"save",[1088,4153,1188],{"class":1122},[1030,4155,4157],{"id":4156},"migration-best-practices","Migration Best Practices",[1073,4159,4161],{"id":4160},"safe-migration-patterns","Safe Migration Patterns",[1078,4163,4165],{"className":1080,"code":4164,"language":1082,"meta":1083,"style":1083},"# 1. Adding nullable fields (safe)\nclass SafeMigration1(migrations.Migration):\n operations = [\n migrations.AddField(\n model_name='post',\n name='excerpt',\n field=models.TextField(blank=True, null=True),\n ),\n ]\n\n# 2. Adding fields with defaults (safe)\nclass SafeMigration2(migrations.Migration):\n operations = [\n migrations.AddField(\n model_name='post',\n name='view_count',\n field=models.PositiveIntegerField(default=0),\n ),\n ]\n\n# 3. Two-step approach for adding NOT NULL fields\n# Step 1: Add nullable field\nclass Migration1(migrations.Migration):\n operations = [\n migrations.AddField(\n model_name='post',\n name='author',\n field=models.ForeignKey(\n 'auth.User',\n on_delete=models.CASCADE,\n null=True,\n blank=True\n ),\n ),\n ]\n\n# Step 2: Populate field and make it NOT NULL\nclass Migration2(migrations.Migration):\n dependencies = [\n ('blog', '0001_add_author_nullable'),\n ]\n \n operations = [\n # First populate the field\n migrations.RunPython(\n code=populate_author_field,\n reverse_code=migrations.RunPython.noop,\n ),\n \n # Then make it NOT NULL\n migrations.AlterField(\n model_name='post',\n name='author',\n field=models.ForeignKey(\n 'auth.User',\n on_delete=models.CASCADE,\n ),\n ),\n ]\n\ndef populate_author_field(apps, schema_editor):\n \"\"\"Populate author field for existing posts\"\"\"\n Post = apps.get_model('blog', 'Post')\n User = apps.get_model('auth', 'User')\n \n # Get or create a default author\n default_author, created = User.objects.get_or_create(\n username='system',\n defaults={\n 'email': 'system@example.com',\n 'first_name': 'System',\n 'last_name': 'User',\n }\n )\n \n # Update posts without authors\n Post.objects.filter(author__isnull=True).update(author=default_author)\n\n# 4. Safe field renaming (three-step process)\n# Step 1: Add new field\nclass RenameStep1(migrations.Migration):\n operations = [\n migrations.AddField(\n model_name='post',\n name='publication_date',\n field=models.DateTimeField(null=True, blank=True),\n ),\n ]\n\n# Step 2: Copy data and update code\nclass RenameStep2(migrations.Migration):\n dependencies = [\n ('blog', 'rename_step1'),\n ]\n \n operations = [\n migrations.RunPython(\n code=copy_published_at_to_publication_date,\n reverse_code=copy_publication_date_to_published_at,\n ),\n ]\n\ndef copy_published_at_to_publication_date(apps, schema_editor):\n Post = apps.get_model('blog', 'Post')\n for post in Post.objects.all():\n post.publication_date = post.published_at\n post.save()\n\ndef copy_publication_date_to_published_at(apps, schema_editor):\n Post = apps.get_model('blog', 'Post')\n for post in Post.objects.all():\n post.published_at = post.publication_date\n post.save()\n\n# Step 3: Remove old field (after code is updated)\nclass RenameStep3(migrations.Migration):\n dependencies = [\n ('blog', 'rename_step2'),\n ]\n \n operations = [\n migrations.RemoveField(\n model_name='post',\n name='published_at',\n ),\n ]\n",[1085,4166,4167,4172,4189,4197,4207,4221,4236,4266,4270,4274,4278,4283,4300,4308,4318,4332,4347,4372,4376,4380,4384,4389,4394,4411,4419,4429,4443,4457,4471,4483,4498,4509,4519,4524,4528,4532,4536,4541,4558,4566,4587,4591,4595,4603,4608,4618,4629,4647,4651,4655,4660,4670,4684,4698,4712,4722,4736,4740,4744,4748,4752,4769,4778,4808,4839,4843,4848,4874,4890,4898,4920,4940,4959,4964,4969,4974,4980,5021,5026,5032,5038,5056,5065,5076,5091,5107,5139,5144,5149,5154,5160,5178,5187,5209,5214,5219,5228,5239,5251,5263,5268,5273,5278,5296,5327,5348,5367,5378,5383,5401,5432,5453,5472,5483,5488,5494,5512,5521,5543,5548,5553,5562,5573,5588,5603,5608],{"__ignoreMap":1083},[1088,4168,4169],{"class":1090,"line":1091},[1088,4170,4171],{"class":1094},"# 1. Adding nullable fields (safe)\n",[1088,4173,4174,4176,4179,4181,4183,4185,4187],{"class":1090,"line":1098},[1088,4175,1115],{"class":1114},[1088,4177,4178],{"class":1118}," SafeMigration1",[1088,4180,1123],{"class":1122},[1088,4182,1024],{"class":1126},[1088,4184,1130],{"class":1122},[1088,4186,1698],{"class":1126},[1088,4188,1136],{"class":1122},[1088,4190,4191,4193,4195],{"class":1090,"line":1105},[1088,4192,1738],{"class":1142},[1088,4194,1146],{"class":1122},[1088,4196,1743],{"class":1122},[1088,4198,4199,4201,4203,4205],{"class":1090,"line":1111},[1088,4200,1749],{"class":1142},[1088,4202,1130],{"class":1122},[1088,4204,2474],{"class":1154},[1088,4206,1757],{"class":1122},[1088,4208,4209,4211,4213,4215,4217,4219],{"class":1090,"line":1139},[1088,4210,2481],{"class":1160},[1088,4212,1146],{"class":1122},[1088,4214,1769],{"class":1768},[1088,4216,2488],{"class":1772},[1088,4218,1769],{"class":1768},[1088,4220,1777],{"class":1122},[1088,4222,4223,4225,4227,4229,4232,4234],{"class":1090,"line":1173},[1088,4224,1763],{"class":1160},[1088,4226,1146],{"class":1122},[1088,4228,1769],{"class":1768},[1088,4230,4231],{"class":1772},"excerpt",[1088,4233,1769],{"class":1768},[1088,4235,1777],{"class":1122},[1088,4237,4238,4240,4242,4244,4246,4248,4250,4252,4254,4256,4258,4260,4262,4264],{"class":1090,"line":1191},[1088,4239,2512],{"class":1160},[1088,4241,1146],{"class":1122},[1088,4243,1127],{"class":1154},[1088,4245,1130],{"class":1122},[1088,4247,1185],{"class":1154},[1088,4249,1123],{"class":1122},[1088,4251,1401],{"class":1160},[1088,4253,1146],{"class":1122},[1088,4255,1407],{"class":1406},[1088,4257,1217],{"class":1122},[1088,4259,2341],{"class":1160},[1088,4261,1146],{"class":1122},[1088,4263,1407],{"class":1406},[1088,4265,2427],{"class":1122},[1088,4267,4268],{"class":1090,"line":1197},[1088,4269,1955],{"class":1122},[1088,4271,4272],{"class":1090,"line":1235},[1088,4273,2207],{"class":1122},[1088,4275,4276],{"class":1090,"line":1240},[1088,4277,1102],{"emptyLinePlaceholder":1101},[1088,4279,4280],{"class":1090,"line":1246},[1088,4281,4282],{"class":1094},"# 2. Adding fields with defaults (safe)\n",[1088,4284,4285,4287,4290,4292,4294,4296,4298],{"class":1090,"line":1252},[1088,4286,1115],{"class":1114},[1088,4288,4289],{"class":1118}," SafeMigration2",[1088,4291,1123],{"class":1122},[1088,4293,1024],{"class":1126},[1088,4295,1130],{"class":1122},[1088,4297,1698],{"class":1126},[1088,4299,1136],{"class":1122},[1088,4301,4302,4304,4306],{"class":1090,"line":1257},[1088,4303,1738],{"class":1142},[1088,4305,1146],{"class":1122},[1088,4307,1743],{"class":1122},[1088,4309,4310,4312,4314,4316],{"class":1090,"line":1263},[1088,4311,1749],{"class":1142},[1088,4313,1130],{"class":1122},[1088,4315,2474],{"class":1154},[1088,4317,1757],{"class":1122},[1088,4319,4320,4322,4324,4326,4328,4330],{"class":1090,"line":1269},[1088,4321,2481],{"class":1160},[1088,4323,1146],{"class":1122},[1088,4325,1769],{"class":1768},[1088,4327,2488],{"class":1772},[1088,4329,1769],{"class":1768},[1088,4331,1777],{"class":1122},[1088,4333,4334,4336,4338,4340,4343,4345],{"class":1090,"line":1274},[1088,4335,1763],{"class":1160},[1088,4337,1146],{"class":1122},[1088,4339,1769],{"class":1768},[1088,4341,4342],{"class":1772},"view_count",[1088,4344,1769],{"class":1768},[1088,4346,1777],{"class":1122},[1088,4348,4349,4351,4353,4355,4357,4360,4362,4365,4367,4370],{"class":1090,"line":1280},[1088,4350,2512],{"class":1160},[1088,4352,1146],{"class":1122},[1088,4354,1127],{"class":1154},[1088,4356,1130],{"class":1122},[1088,4358,4359],{"class":1154},"PositiveIntegerField",[1088,4361,1123],{"class":1122},[1088,4363,4364],{"class":1160},"default",[1088,4366,1146],{"class":1122},[1088,4368,4369],{"class":1166},"0",[1088,4371,2427],{"class":1122},[1088,4373,4374],{"class":1090,"line":1286},[1088,4375,1955],{"class":1122},[1088,4377,4378],{"class":1090,"line":1291},[1088,4379,2207],{"class":1122},[1088,4381,4382],{"class":1090,"line":1297},[1088,4383,1102],{"emptyLinePlaceholder":1101},[1088,4385,4386],{"class":1090,"line":1615},[1088,4387,4388],{"class":1094},"# 3. Two-step approach for adding NOT NULL fields\n",[1088,4390,4391],{"class":1090,"line":1621},[1088,4392,4393],{"class":1094},"# Step 1: Add nullable field\n",[1088,4395,4396,4398,4401,4403,4405,4407,4409],{"class":1090,"line":1627},[1088,4397,1115],{"class":1114},[1088,4399,4400],{"class":1118}," Migration1",[1088,4402,1123],{"class":1122},[1088,4404,1024],{"class":1126},[1088,4406,1130],{"class":1122},[1088,4408,1698],{"class":1126},[1088,4410,1136],{"class":1122},[1088,4412,4413,4415,4417],{"class":1090,"line":1632},[1088,4414,1738],{"class":1142},[1088,4416,1146],{"class":1122},[1088,4418,1743],{"class":1122},[1088,4420,4421,4423,4425,4427],{"class":1090,"line":1638},[1088,4422,1749],{"class":1142},[1088,4424,1130],{"class":1122},[1088,4426,2474],{"class":1154},[1088,4428,1757],{"class":1122},[1088,4430,4431,4433,4435,4437,4439,4441],{"class":1090,"line":1658},[1088,4432,2481],{"class":1160},[1088,4434,1146],{"class":1122},[1088,4436,1769],{"class":1768},[1088,4438,2488],{"class":1772},[1088,4440,1769],{"class":1768},[1088,4442,1777],{"class":1122},[1088,4444,4445,4447,4449,4451,4453,4455],{"class":1090,"line":1679},[1088,4446,1763],{"class":1160},[1088,4448,1146],{"class":1122},[1088,4450,1769],{"class":1768},[1088,4452,2503],{"class":1772},[1088,4454,1769],{"class":1768},[1088,4456,1777],{"class":1122},[1088,4458,4459,4461,4463,4465,4467,4469],{"class":1090,"line":1684},[1088,4460,2512],{"class":1160},[1088,4462,1146],{"class":1122},[1088,4464,1127],{"class":1154},[1088,4466,1130],{"class":1122},[1088,4468,1209],{"class":1154},[1088,4470,1757],{"class":1122},[1088,4472,4473,4476,4479,4481],{"class":1090,"line":1703},[1088,4474,4475],{"class":1768}," '",[1088,4477,4478],{"class":1772},"auth.User",[1088,4480,1769],{"class":1768},[1088,4482,1777],{"class":1122},[1088,4484,4485,4488,4490,4492,4494,4496],{"class":1090,"line":1714},[1088,4486,4487],{"class":1160}," on_delete",[1088,4489,1146],{"class":1122},[1088,4491,1127],{"class":1154},[1088,4493,1130],{"class":1122},[1088,4495,1230],{"class":1229},[1088,4497,1777],{"class":1122},[1088,4499,4500,4503,4505,4507],{"class":1090,"line":1719},[1088,4501,4502],{"class":1160}," null",[1088,4504,1146],{"class":1122},[1088,4506,1407],{"class":1406},[1088,4508,1777],{"class":1122},[1088,4510,4511,4514,4516],{"class":1090,"line":1730},[1088,4512,4513],{"class":1160}," blank",[1088,4515,1146],{"class":1122},[1088,4517,4518],{"class":1406},"True\n",[1088,4520,4521],{"class":1090,"line":1735},[1088,4522,4523],{"class":1122}," ),\n",[1088,4525,4526],{"class":1090,"line":1746},[1088,4527,1955],{"class":1122},[1088,4529,4530],{"class":1090,"line":1760},[1088,4531,2207],{"class":1122},[1088,4533,4534],{"class":1090,"line":1780},[1088,4535,1102],{"emptyLinePlaceholder":1101},[1088,4537,4538],{"class":1090,"line":1789},[1088,4539,4540],{"class":1094},"# Step 2: Populate field and make it NOT NULL\n",[1088,4542,4543,4545,4548,4550,4552,4554,4556],{"class":1090,"line":1856},[1088,4544,1115],{"class":1114},[1088,4546,4547],{"class":1118}," Migration2",[1088,4549,1123],{"class":1122},[1088,4551,1024],{"class":1126},[1088,4553,1130],{"class":1122},[1088,4555,1698],{"class":1126},[1088,4557,1136],{"class":1122},[1088,4559,4560,4562,4564],{"class":1090,"line":1886},[1088,4561,1722],{"class":1142},[1088,4563,1146],{"class":1122},[1088,4565,1743],{"class":1122},[1088,4567,4568,4570,4572,4574,4576,4578,4580,4583,4585],{"class":1090,"line":1916},[1088,4569,2407],{"class":1122},[1088,4571,1769],{"class":1768},[1088,4573,2436],{"class":1772},[1088,4575,1769],{"class":1768},[1088,4577,1217],{"class":1122},[1088,4579,2419],{"class":1768},[1088,4581,4582],{"class":1772},"0001_add_author_nullable",[1088,4584,1769],{"class":1768},[1088,4586,2427],{"class":1122},[1088,4588,4589],{"class":1090,"line":1946},[1088,4590,2207],{"class":1122},[1088,4592,4593],{"class":1090,"line":1952},[1088,4594,1439],{"class":1142},[1088,4596,4597,4599,4601],{"class":1090,"line":1958},[1088,4598,1738],{"class":1142},[1088,4600,1146],{"class":1122},[1088,4602,1743],{"class":1122},[1088,4604,4605],{"class":1090,"line":1969},[1088,4606,4607],{"class":1094}," # First populate the field\n",[1088,4609,4610,4612,4614,4616],{"class":1090,"line":1985},[1088,4611,1749],{"class":1142},[1088,4613,1130],{"class":1122},[1088,4615,3954],{"class":1154},[1088,4617,1757],{"class":1122},[1088,4619,4620,4622,4624,4627],{"class":1090,"line":1992},[1088,4621,3961],{"class":1160},[1088,4623,1146],{"class":1122},[1088,4625,4626],{"class":1154},"populate_author_field",[1088,4628,1777],{"class":1122},[1088,4630,4631,4633,4635,4637,4639,4641,4643,4645],{"class":1090,"line":2049},[1088,4632,3973],{"class":1160},[1088,4634,1146],{"class":1122},[1088,4636,1024],{"class":1154},[1088,4638,1130],{"class":1122},[1088,4640,3954],{"class":1470},[1088,4642,1130],{"class":1122},[1088,4644,3986],{"class":1470},[1088,4646,1777],{"class":1122},[1088,4648,4649],{"class":1090,"line":2079},[1088,4650,1955],{"class":1122},[1088,4652,4653],{"class":1090,"line":2102},[1088,4654,3858],{"class":1142},[1088,4656,4657],{"class":1090,"line":2131},[1088,4658,4659],{"class":1094}," # Then make it NOT NULL\n",[1088,4661,4662,4664,4666,4668],{"class":1090,"line":2194},[1088,4663,1749],{"class":1142},[1088,4665,1130],{"class":1122},[1088,4667,3187],{"class":1154},[1088,4669,1757],{"class":1122},[1088,4671,4672,4674,4676,4678,4680,4682],{"class":1090,"line":2199},[1088,4673,2481],{"class":1160},[1088,4675,1146],{"class":1122},[1088,4677,1769],{"class":1768},[1088,4679,2488],{"class":1772},[1088,4681,1769],{"class":1768},[1088,4683,1777],{"class":1122},[1088,4685,4686,4688,4690,4692,4694,4696],{"class":1090,"line":2204},[1088,4687,1763],{"class":1160},[1088,4689,1146],{"class":1122},[1088,4691,1769],{"class":1768},[1088,4693,2503],{"class":1772},[1088,4695,1769],{"class":1768},[1088,4697,1777],{"class":1122},[1088,4699,4700,4702,4704,4706,4708,4710],{"class":1090,"line":2955},[1088,4701,2512],{"class":1160},[1088,4703,1146],{"class":1122},[1088,4705,1127],{"class":1154},[1088,4707,1130],{"class":1122},[1088,4709,1209],{"class":1154},[1088,4711,1757],{"class":1122},[1088,4713,4714,4716,4718,4720],{"class":1090,"line":2972},[1088,4715,4475],{"class":1768},[1088,4717,4478],{"class":1772},[1088,4719,1769],{"class":1768},[1088,4721,1777],{"class":1122},[1088,4723,4724,4726,4728,4730,4732,4734],{"class":1090,"line":2978},[1088,4725,4487],{"class":1160},[1088,4727,1146],{"class":1122},[1088,4729,1127],{"class":1154},[1088,4731,1130],{"class":1122},[1088,4733,1230],{"class":1229},[1088,4735,1777],{"class":1122},[1088,4737,4738],{"class":1090,"line":3002},[1088,4739,4523],{"class":1122},[1088,4741,4742],{"class":1090,"line":3017},[1088,4743,1955],{"class":1122},[1088,4745,4746],{"class":1090,"line":3048},[1088,4747,2207],{"class":1122},[1088,4749,4750],{"class":1090,"line":3079},[1088,4751,1102],{"emptyLinePlaceholder":1101},[1088,4753,4754,4756,4759,4761,4763,4765,4767],{"class":1090,"line":3102},[1088,4755,4005],{"class":1114},[1088,4757,4758],{"class":4008}," populate_author_field",[1088,4760,1123],{"class":1122},[1088,4762,4015],{"class":4014},[1088,4764,1217],{"class":1122},[1088,4766,4020],{"class":4014},[1088,4768,1136],{"class":1122},[1088,4770,4771,4773,4776],{"class":1090,"line":3107},[1088,4772,4027],{"class":3548},[1088,4774,4775],{"class":3554},"Populate author field for existing posts",[1088,4777,4033],{"class":3548},[1088,4779,4780,4782,4784,4786,4788,4790,4792,4794,4796,4798,4800,4802,4804,4806],{"class":1090,"line":3113},[1088,4781,4038],{"class":1142},[1088,4783,1146],{"class":1122},[1088,4785,4043],{"class":1142},[1088,4787,1130],{"class":1122},[1088,4789,4048],{"class":1154},[1088,4791,1123],{"class":1122},[1088,4793,1769],{"class":1768},[1088,4795,2436],{"class":1772},[1088,4797,1769],{"class":1768},[1088,4799,1217],{"class":1122},[1088,4801,2419],{"class":1768},[1088,4803,1978],{"class":1772},[1088,4805,1769],{"class":1768},[1088,4807,1170],{"class":1122},[1088,4809,4810,4813,4815,4817,4819,4821,4823,4825,4827,4829,4831,4833,4835,4837],{"class":1090,"line":3130},[1088,4811,4812],{"class":1142}," User ",[1088,4814,1146],{"class":1122},[1088,4816,4043],{"class":1142},[1088,4818,1130],{"class":1122},[1088,4820,4048],{"class":1154},[1088,4822,1123],{"class":1122},[1088,4824,1769],{"class":1768},[1088,4826,2412],{"class":1772},[1088,4828,1769],{"class":1768},[1088,4830,1217],{"class":1122},[1088,4832,2419],{"class":1768},[1088,4834,1214],{"class":1772},[1088,4836,1769],{"class":1768},[1088,4838,1170],{"class":1122},[1088,4840,4841],{"class":1090,"line":3139},[1088,4842,1439],{"class":1142},[1088,4844,4845],{"class":1090,"line":3161},[1088,4846,4847],{"class":1094}," # Get or create a default author\n",[1088,4849,4850,4853,4855,4858,4860,4863,4865,4867,4869,4872],{"class":1090,"line":3166},[1088,4851,4852],{"class":1142}," default_author",[1088,4854,1217],{"class":1122},[1088,4856,4857],{"class":1142}," created ",[1088,4859,1146],{"class":1122},[1088,4861,4862],{"class":1142}," User",[1088,4864,1130],{"class":1122},[1088,4866,4109],{"class":1470},[1088,4868,1130],{"class":1122},[1088,4870,4871],{"class":1154},"get_or_create",[1088,4873,1757],{"class":1122},[1088,4875,4876,4879,4881,4883,4886,4888],{"class":1090,"line":3171},[1088,4877,4878],{"class":1160}," username",[1088,4880,1146],{"class":1122},[1088,4882,1769],{"class":1768},[1088,4884,4885],{"class":1772},"system",[1088,4887,1769],{"class":1768},[1088,4889,1777],{"class":1122},[1088,4891,4892,4895],{"class":1090,"line":3180},[1088,4893,4894],{"class":1160}," defaults",[1088,4896,4897],{"class":1122},"={\n",[1088,4899,4900,4903,4906,4908,4911,4913,4916,4918],{"class":1090,"line":3192},[1088,4901,4902],{"class":1768}," '",[1088,4904,4905],{"class":1772},"email",[1088,4907,1769],{"class":1768},[1088,4909,4910],{"class":1122},":",[1088,4912,2419],{"class":1768},[1088,4914,4915],{"class":1772},"system@example.com",[1088,4917,1769],{"class":1768},[1088,4919,1777],{"class":1122},[1088,4921,4922,4924,4927,4929,4931,4933,4936,4938],{"class":1090,"line":3207},[1088,4923,4902],{"class":1768},[1088,4925,4926],{"class":1772},"first_name",[1088,4928,1769],{"class":1768},[1088,4930,4910],{"class":1122},[1088,4932,2419],{"class":1768},[1088,4934,4935],{"class":1772},"System",[1088,4937,1769],{"class":1768},[1088,4939,1777],{"class":1122},[1088,4941,4942,4944,4947,4949,4951,4953,4955,4957],{"class":1090,"line":3222},[1088,4943,4902],{"class":1768},[1088,4945,4946],{"class":1772},"last_name",[1088,4948,1769],{"class":1768},[1088,4950,4910],{"class":1122},[1088,4952,2419],{"class":1768},[1088,4954,1214],{"class":1772},[1088,4956,1769],{"class":1768},[1088,4958,1777],{"class":1122},[1088,4960,4961],{"class":1090,"line":3245},[1088,4962,4963],{"class":1122}," }\n",[1088,4965,4966],{"class":1090,"line":3250},[1088,4967,4968],{"class":1122}," )\n",[1088,4970,4972],{"class":1090,"line":4971},75,[1088,4973,1439],{"class":1142},[1088,4975,4977],{"class":1090,"line":4976},76,[1088,4978,4979],{"class":1094}," # Update posts without authors\n",[1088,4981,4983,4986,4988,4990,4992,4995,4997,5000,5002,5004,5007,5010,5012,5014,5016,5019],{"class":1090,"line":4982},77,[1088,4984,4985],{"class":1142}," Post",[1088,4987,1130],{"class":1122},[1088,4989,4109],{"class":1470},[1088,4991,1130],{"class":1122},[1088,4993,4994],{"class":1154},"filter",[1088,4996,1123],{"class":1122},[1088,4998,4999],{"class":1160},"author__isnull",[1088,5001,1146],{"class":1122},[1088,5003,1407],{"class":1406},[1088,5005,5006],{"class":1122},").",[1088,5008,5009],{"class":1154},"update",[1088,5011,1123],{"class":1122},[1088,5013,2503],{"class":1160},[1088,5015,1146],{"class":1122},[1088,5017,5018],{"class":1154},"default_author",[1088,5020,1170],{"class":1122},[1088,5022,5024],{"class":1090,"line":5023},78,[1088,5025,1102],{"emptyLinePlaceholder":1101},[1088,5027,5029],{"class":1090,"line":5028},79,[1088,5030,5031],{"class":1094},"# 4. Safe field renaming (three-step process)\n",[1088,5033,5035],{"class":1090,"line":5034},80,[1088,5036,5037],{"class":1094},"# Step 1: Add new field\n",[1088,5039,5041,5043,5046,5048,5050,5052,5054],{"class":1090,"line":5040},81,[1088,5042,1115],{"class":1114},[1088,5044,5045],{"class":1118}," RenameStep1",[1088,5047,1123],{"class":1122},[1088,5049,1024],{"class":1126},[1088,5051,1130],{"class":1122},[1088,5053,1698],{"class":1126},[1088,5055,1136],{"class":1122},[1088,5057,5059,5061,5063],{"class":1090,"line":5058},82,[1088,5060,1738],{"class":1142},[1088,5062,1146],{"class":1122},[1088,5064,1743],{"class":1122},[1088,5066,5068,5070,5072,5074],{"class":1090,"line":5067},83,[1088,5069,1749],{"class":1142},[1088,5071,1130],{"class":1122},[1088,5073,2474],{"class":1154},[1088,5075,1757],{"class":1122},[1088,5077,5079,5081,5083,5085,5087,5089],{"class":1090,"line":5078},84,[1088,5080,2481],{"class":1160},[1088,5082,1146],{"class":1122},[1088,5084,1769],{"class":1768},[1088,5086,2488],{"class":1772},[1088,5088,1769],{"class":1768},[1088,5090,1777],{"class":1122},[1088,5092,5094,5096,5098,5100,5103,5105],{"class":1090,"line":5093},85,[1088,5095,1763],{"class":1160},[1088,5097,1146],{"class":1122},[1088,5099,1769],{"class":1768},[1088,5101,5102],{"class":1772},"publication_date",[1088,5104,1769],{"class":1768},[1088,5106,1777],{"class":1122},[1088,5108,5110,5112,5114,5116,5118,5120,5122,5124,5126,5128,5130,5133,5135,5137],{"class":1090,"line":5109},86,[1088,5111,2512],{"class":1160},[1088,5113,1146],{"class":1122},[1088,5115,1127],{"class":1154},[1088,5117,1130],{"class":1122},[1088,5119,1423],{"class":1154},[1088,5121,1123],{"class":1122},[1088,5123,2525],{"class":1160},[1088,5125,1146],{"class":1122},[1088,5127,1407],{"class":1406},[1088,5129,1217],{"class":1122},[1088,5131,5132],{"class":1160}," blank",[1088,5134,1146],{"class":1122},[1088,5136,1407],{"class":1406},[1088,5138,2427],{"class":1122},[1088,5140,5142],{"class":1090,"line":5141},87,[1088,5143,1955],{"class":1122},[1088,5145,5147],{"class":1090,"line":5146},88,[1088,5148,2207],{"class":1122},[1088,5150,5152],{"class":1090,"line":5151},89,[1088,5153,1102],{"emptyLinePlaceholder":1101},[1088,5155,5157],{"class":1090,"line":5156},90,[1088,5158,5159],{"class":1094},"# Step 2: Copy data and update code\n",[1088,5161,5163,5165,5168,5170,5172,5174,5176],{"class":1090,"line":5162},91,[1088,5164,1115],{"class":1114},[1088,5166,5167],{"class":1118}," RenameStep2",[1088,5169,1123],{"class":1122},[1088,5171,1024],{"class":1126},[1088,5173,1130],{"class":1122},[1088,5175,1698],{"class":1126},[1088,5177,1136],{"class":1122},[1088,5179,5181,5183,5185],{"class":1090,"line":5180},92,[1088,5182,1722],{"class":1142},[1088,5184,1146],{"class":1122},[1088,5186,1743],{"class":1122},[1088,5188,5190,5192,5194,5196,5198,5200,5202,5205,5207],{"class":1090,"line":5189},93,[1088,5191,2407],{"class":1122},[1088,5193,1769],{"class":1768},[1088,5195,2436],{"class":1772},[1088,5197,1769],{"class":1768},[1088,5199,1217],{"class":1122},[1088,5201,2419],{"class":1768},[1088,5203,5204],{"class":1772},"rename_step1",[1088,5206,1769],{"class":1768},[1088,5208,2427],{"class":1122},[1088,5210,5212],{"class":1090,"line":5211},94,[1088,5213,2207],{"class":1122},[1088,5215,5217],{"class":1090,"line":5216},95,[1088,5218,1439],{"class":1142},[1088,5220,5222,5224,5226],{"class":1090,"line":5221},96,[1088,5223,1738],{"class":1142},[1088,5225,1146],{"class":1122},[1088,5227,1743],{"class":1122},[1088,5229,5231,5233,5235,5237],{"class":1090,"line":5230},97,[1088,5232,1749],{"class":1142},[1088,5234,1130],{"class":1122},[1088,5236,3954],{"class":1154},[1088,5238,1757],{"class":1122},[1088,5240,5242,5244,5246,5249],{"class":1090,"line":5241},98,[1088,5243,3961],{"class":1160},[1088,5245,1146],{"class":1122},[1088,5247,5248],{"class":1154},"copy_published_at_to_publication_date",[1088,5250,1777],{"class":1122},[1088,5252,5254,5256,5258,5261],{"class":1090,"line":5253},99,[1088,5255,3973],{"class":1160},[1088,5257,1146],{"class":1122},[1088,5259,5260],{"class":1154},"copy_publication_date_to_published_at",[1088,5262,1777],{"class":1122},[1088,5264,5266],{"class":1090,"line":5265},100,[1088,5267,1955],{"class":1122},[1088,5269,5271],{"class":1090,"line":5270},101,[1088,5272,2207],{"class":1122},[1088,5274,5276],{"class":1090,"line":5275},102,[1088,5277,1102],{"emptyLinePlaceholder":1101},[1088,5279,5281,5283,5286,5288,5290,5292,5294],{"class":1090,"line":5280},103,[1088,5282,4005],{"class":1114},[1088,5284,5285],{"class":4008}," copy_published_at_to_publication_date",[1088,5287,1123],{"class":1122},[1088,5289,4015],{"class":4014},[1088,5291,1217],{"class":1122},[1088,5293,4020],{"class":4014},[1088,5295,1136],{"class":1122},[1088,5297,5299,5301,5303,5305,5307,5309,5311,5313,5315,5317,5319,5321,5323,5325],{"class":1090,"line":5298},104,[1088,5300,4038],{"class":1142},[1088,5302,1146],{"class":1122},[1088,5304,4043],{"class":1142},[1088,5306,1130],{"class":1122},[1088,5308,4048],{"class":1154},[1088,5310,1123],{"class":1122},[1088,5312,1769],{"class":1768},[1088,5314,2436],{"class":1772},[1088,5316,1769],{"class":1768},[1088,5318,1217],{"class":1122},[1088,5320,2419],{"class":1768},[1088,5322,1978],{"class":1772},[1088,5324,1769],{"class":1768},[1088,5326,1170],{"class":1122},[1088,5328,5330,5332,5334,5336,5338,5340,5342,5344,5346],{"class":1090,"line":5329},105,[1088,5331,4096],{"class":1323},[1088,5333,4099],{"class":1142},[1088,5335,4102],{"class":1323},[1088,5337,1119],{"class":1142},[1088,5339,1130],{"class":1122},[1088,5341,4109],{"class":1470},[1088,5343,1130],{"class":1122},[1088,5345,4114],{"class":1154},[1088,5347,4117],{"class":1122},[1088,5349,5351,5353,5355,5357,5359,5362,5364],{"class":1090,"line":5350},106,[1088,5352,4122],{"class":1142},[1088,5354,1130],{"class":1122},[1088,5356,5102],{"class":1470},[1088,5358,4129],{"class":1122},[1088,5360,5361],{"class":1142}," post",[1088,5363,1130],{"class":1122},[1088,5365,5366],{"class":1470},"published_at\n",[1088,5368,5370,5372,5374,5376],{"class":1090,"line":5369},107,[1088,5371,4122],{"class":1142},[1088,5373,1130],{"class":1122},[1088,5375,4151],{"class":1154},[1088,5377,1188],{"class":1122},[1088,5379,5381],{"class":1090,"line":5380},108,[1088,5382,1102],{"emptyLinePlaceholder":1101},[1088,5384,5386,5388,5391,5393,5395,5397,5399],{"class":1090,"line":5385},109,[1088,5387,4005],{"class":1114},[1088,5389,5390],{"class":4008}," copy_publication_date_to_published_at",[1088,5392,1123],{"class":1122},[1088,5394,4015],{"class":4014},[1088,5396,1217],{"class":1122},[1088,5398,4020],{"class":4014},[1088,5400,1136],{"class":1122},[1088,5402,5404,5406,5408,5410,5412,5414,5416,5418,5420,5422,5424,5426,5428,5430],{"class":1090,"line":5403},110,[1088,5405,4038],{"class":1142},[1088,5407,1146],{"class":1122},[1088,5409,4043],{"class":1142},[1088,5411,1130],{"class":1122},[1088,5413,4048],{"class":1154},[1088,5415,1123],{"class":1122},[1088,5417,1769],{"class":1768},[1088,5419,2436],{"class":1772},[1088,5421,1769],{"class":1768},[1088,5423,1217],{"class":1122},[1088,5425,2419],{"class":1768},[1088,5427,1978],{"class":1772},[1088,5429,1769],{"class":1768},[1088,5431,1170],{"class":1122},[1088,5433,5435,5437,5439,5441,5443,5445,5447,5449,5451],{"class":1090,"line":5434},111,[1088,5436,4096],{"class":1323},[1088,5438,4099],{"class":1142},[1088,5440,4102],{"class":1323},[1088,5442,1119],{"class":1142},[1088,5444,1130],{"class":1122},[1088,5446,4109],{"class":1470},[1088,5448,1130],{"class":1122},[1088,5450,4114],{"class":1154},[1088,5452,4117],{"class":1122},[1088,5454,5456,5458,5460,5463,5465,5467,5469],{"class":1090,"line":5455},112,[1088,5457,4122],{"class":1142},[1088,5459,1130],{"class":1122},[1088,5461,5462],{"class":1470},"published_at",[1088,5464,4129],{"class":1122},[1088,5466,5361],{"class":1142},[1088,5468,1130],{"class":1122},[1088,5470,5471],{"class":1470},"publication_date\n",[1088,5473,5475,5477,5479,5481],{"class":1090,"line":5474},113,[1088,5476,4122],{"class":1142},[1088,5478,1130],{"class":1122},[1088,5480,4151],{"class":1154},[1088,5482,1188],{"class":1122},[1088,5484,5486],{"class":1090,"line":5485},114,[1088,5487,1102],{"emptyLinePlaceholder":1101},[1088,5489,5491],{"class":1090,"line":5490},115,[1088,5492,5493],{"class":1094},"# Step 3: Remove old field (after code is updated)\n",[1088,5495,5497,5499,5502,5504,5506,5508,5510],{"class":1090,"line":5496},116,[1088,5498,1115],{"class":1114},[1088,5500,5501],{"class":1118}," RenameStep3",[1088,5503,1123],{"class":1122},[1088,5505,1024],{"class":1126},[1088,5507,1130],{"class":1122},[1088,5509,1698],{"class":1126},[1088,5511,1136],{"class":1122},[1088,5513,5515,5517,5519],{"class":1090,"line":5514},117,[1088,5516,1722],{"class":1142},[1088,5518,1146],{"class":1122},[1088,5520,1743],{"class":1122},[1088,5522,5524,5526,5528,5530,5532,5534,5536,5539,5541],{"class":1090,"line":5523},118,[1088,5525,2407],{"class":1122},[1088,5527,1769],{"class":1768},[1088,5529,2436],{"class":1772},[1088,5531,1769],{"class":1768},[1088,5533,1217],{"class":1122},[1088,5535,2419],{"class":1768},[1088,5537,5538],{"class":1772},"rename_step2",[1088,5540,1769],{"class":1768},[1088,5542,2427],{"class":1122},[1088,5544,5546],{"class":1090,"line":5545},119,[1088,5547,2207],{"class":1122},[1088,5549,5551],{"class":1090,"line":5550},120,[1088,5552,1439],{"class":1142},[1088,5554,5556,5558,5560],{"class":1090,"line":5555},121,[1088,5557,1738],{"class":1142},[1088,5559,1146],{"class":1122},[1088,5561,1743],{"class":1122},[1088,5563,5565,5567,5569,5571],{"class":1090,"line":5564},122,[1088,5566,1749],{"class":1142},[1088,5568,1130],{"class":1122},[1088,5570,2805],{"class":1154},[1088,5572,1757],{"class":1122},[1088,5574,5576,5578,5580,5582,5584,5586],{"class":1090,"line":5575},123,[1088,5577,2481],{"class":1160},[1088,5579,1146],{"class":1122},[1088,5581,1769],{"class":1768},[1088,5583,2488],{"class":1772},[1088,5585,1769],{"class":1768},[1088,5587,1777],{"class":1122},[1088,5589,5591,5593,5595,5597,5599,5601],{"class":1090,"line":5590},124,[1088,5592,1763],{"class":1160},[1088,5594,1146],{"class":1122},[1088,5596,1769],{"class":1768},[1088,5598,5462],{"class":1772},[1088,5600,1769],{"class":1768},[1088,5602,1777],{"class":1122},[1088,5604,5606],{"class":1090,"line":5605},125,[1088,5607,1955],{"class":1122},[1088,5609,5611],{"class":1090,"line":5610},126,[1088,5612,2207],{"class":1122},[1073,5614,5616],{"id":5615},"performance-considerations","Performance Considerations",[1078,5618,5620],{"className":1080,"code":5619,"language":1082,"meta":1083,"style":1083},"class PerformanceMigrationPatterns:\n \"\"\"\n Performance considerations for migrations:\n \n 1. Large Table Migrations\n - Consider maintenance windows for large tables\n - Use database-specific optimizations\n - Split large migrations into smaller chunks\n \n 2. Index Creation\n - Create indexes CONCURRENTLY when possible (PostgreSQL)\n - Consider creating indexes during low-traffic periods\n - Monitor index creation progress\n \n 3. Data Migrations\n - Process data in batches to avoid memory issues\n - Use bulk operations when possible\n - Provide progress feedback for long-running operations\n \n 4. Backwards Compatibility\n - Ensure migrations can be safely reversed\n - Test rollback procedures\n - Document any manual steps required\n \"\"\"\n \n @staticmethod\n def create_concurrent_index_migration():\n \"\"\"Example of creating index concurrently (PostgreSQL)\"\"\"\n \n return migrations.RunSQL(\n sql=\"CREATE INDEX CONCURRENTLY idx_post_title ON blog_post(title);\",\n reverse_sql=\"DROP INDEX idx_post_title;\",\n )\n \n @staticmethod\n def batch_data_migration():\n \"\"\"Example of processing data in batches\"\"\"\n \n def update_posts_in_batches(apps, schema_editor):\n Post = apps.get_model('blog', 'Post')\n \n batch_size = 1000\n total_posts = Post.objects.count()\n processed = 0\n \n while processed \u003C total_posts:\n posts = Post.objects.all()[processed:processed + batch_size]\n \n for post in posts:\n # Perform update operation\n post.slug = slugify(post.title)\n post.save()\n \n processed += batch_size\n print(f\"Processed {processed}/{total_posts} posts\")\n \n return migrations.RunPython(\n code=update_posts_in_batches,\n reverse_code=migrations.RunPython.noop,\n )\n\n# Example of a production-ready migration\nclass ProductionMigration(migrations.Migration):\n \"\"\"\n Production migration with safety checks and performance optimizations\n \"\"\"\n \n dependencies = [\n ('blog', '0005_previous_migration'),\n ]\n \n operations = [\n # Add field as nullable first\n migrations.AddField(\n model_name='post',\n name='featured_image',\n field=models.ImageField(\n upload_to='posts/featured/',\n null=True,\n blank=True\n ),\n ),\n \n # Create index concurrently (PostgreSQL)\n migrations.RunSQL(\n sql=\"CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_post_featured \"\n \"ON blog_post(featured_image) WHERE featured_image IS NOT NULL;\",\n reverse_sql=\"DROP INDEX IF EXISTS idx_post_featured;\",\n state_operations=[\n migrations.AddIndex(\n model_name='post',\n index=models.Index(\n fields=['featured_image'],\n name='idx_post_featured',\n condition=models.Q(featured_image__isnull=False)\n ),\n ),\n ],\n ),\n ]\n \n # Add atomic = False for long-running migrations\n atomic = False\n",[1085,5621,5622,5631,5635,5640,5644,5649,5654,5659,5664,5668,5673,5678,5683,5688,5692,5697,5702,5707,5712,5716,5720,5725,5730,5735,5739,5743,5752,5761,5771,5775,5788,5805,5821,5826,5830,5836,5845,5854,5858,5876,5907,5912,5922,5942,5952,5956,5973,6010,6015,6029,6034,6057,6067,6071,6082,6119,6123,6135,6146,6164,6168,6172,6177,6194,6198,6203,6207,6211,6219,6240,6244,6248,6256,6261,6271,6285,6300,6315,6331,6341,6349,6353,6357,6361,6366,6376,6390,6402,6417,6424,6436,6451,6467,6484,6500,6525,6530,6535,6539,6543,6547,6551,6556],{"__ignoreMap":1083},[1088,5623,5624,5626,5629],{"class":1090,"line":1091},[1088,5625,1115],{"class":1114},[1088,5627,5628],{"class":1118}," PerformanceMigrationPatterns",[1088,5630,3543],{"class":1122},[1088,5632,5633],{"class":1090,"line":1098},[1088,5634,3549],{"class":3548},[1088,5636,5637],{"class":1090,"line":1105},[1088,5638,5639],{"class":3554}," Performance considerations for migrations:\n",[1088,5641,5642],{"class":1090,"line":1111},[1088,5643,1439],{"class":3554},[1088,5645,5646],{"class":1090,"line":1139},[1088,5647,5648],{"class":3554}," 1. Large Table Migrations\n",[1088,5650,5651],{"class":1090,"line":1173},[1088,5652,5653],{"class":3554}," - Consider maintenance windows for large tables\n",[1088,5655,5656],{"class":1090,"line":1191},[1088,5657,5658],{"class":3554}," - Use database-specific optimizations\n",[1088,5660,5661],{"class":1090,"line":1197},[1088,5662,5663],{"class":3554}," - Split large migrations into smaller chunks\n",[1088,5665,5666],{"class":1090,"line":1235},[1088,5667,1439],{"class":3554},[1088,5669,5670],{"class":1090,"line":1240},[1088,5671,5672],{"class":3554}," 2. Index Creation\n",[1088,5674,5675],{"class":1090,"line":1246},[1088,5676,5677],{"class":3554}," - Create indexes CONCURRENTLY when possible (PostgreSQL)\n",[1088,5679,5680],{"class":1090,"line":1252},[1088,5681,5682],{"class":3554}," - Consider creating indexes during low-traffic periods\n",[1088,5684,5685],{"class":1090,"line":1257},[1088,5686,5687],{"class":3554}," - Monitor index creation progress\n",[1088,5689,5690],{"class":1090,"line":1263},[1088,5691,1439],{"class":3554},[1088,5693,5694],{"class":1090,"line":1269},[1088,5695,5696],{"class":3554}," 3. Data Migrations\n",[1088,5698,5699],{"class":1090,"line":1274},[1088,5700,5701],{"class":3554}," - Process data in batches to avoid memory issues\n",[1088,5703,5704],{"class":1090,"line":1280},[1088,5705,5706],{"class":3554}," - Use bulk operations when possible\n",[1088,5708,5709],{"class":1090,"line":1286},[1088,5710,5711],{"class":3554}," - Provide progress feedback for long-running operations\n",[1088,5713,5714],{"class":1090,"line":1291},[1088,5715,1439],{"class":3554},[1088,5717,5718],{"class":1090,"line":1297},[1088,5719,3636],{"class":3554},[1088,5721,5722],{"class":1090,"line":1615},[1088,5723,5724],{"class":3554}," - Ensure migrations can be safely reversed\n",[1088,5726,5727],{"class":1090,"line":1621},[1088,5728,5729],{"class":3554}," - Test rollback procedures\n",[1088,5731,5732],{"class":1090,"line":1627},[1088,5733,5734],{"class":3554}," - Document any manual steps required\n",[1088,5736,5737],{"class":1090,"line":1632},[1088,5738,3549],{"class":3548},[1088,5740,5741],{"class":1090,"line":1638},[1088,5742,1439],{"class":1142},[1088,5744,5745,5748],{"class":1090,"line":1658},[1088,5746,5747],{"class":1122}," @",[1088,5749,5751],{"class":5750},"sa2tF","staticmethod\n",[1088,5753,5754,5756,5759],{"class":1090,"line":1679},[1088,5755,1444],{"class":1114},[1088,5757,5758],{"class":4008}," create_concurrent_index_migration",[1088,5760,4117],{"class":1122},[1088,5762,5763,5766,5769],{"class":1090,"line":1684},[1088,5764,5765],{"class":3548}," \"\"\"",[1088,5767,5768],{"class":3554},"Example of creating index concurrently (PostgreSQL)",[1088,5770,4033],{"class":3548},[1088,5772,5773],{"class":1090,"line":1703},[1088,5774,3858],{"class":1142},[1088,5776,5777,5779,5781,5783,5786],{"class":1090,"line":1714},[1088,5778,1461],{"class":1323},[1088,5780,1651],{"class":1142},[1088,5782,1130],{"class":1122},[1088,5784,5785],{"class":1154},"RunSQL",[1088,5787,1757],{"class":1122},[1088,5789,5790,5793,5795,5798,5801,5803],{"class":1090,"line":1719},[1088,5791,5792],{"class":1160}," sql",[1088,5794,1146],{"class":1122},[1088,5796,5797],{"class":1768},"\"",[1088,5799,5800],{"class":1772},"CREATE INDEX CONCURRENTLY idx_post_title ON blog_post(title);",[1088,5802,5797],{"class":1768},[1088,5804,1777],{"class":1122},[1088,5806,5807,5810,5812,5814,5817,5819],{"class":1090,"line":1730},[1088,5808,5809],{"class":1160}," reverse_sql",[1088,5811,1146],{"class":1122},[1088,5813,5797],{"class":1768},[1088,5815,5816],{"class":1772},"DROP INDEX idx_post_title;",[1088,5818,5797],{"class":1768},[1088,5820,1777],{"class":1122},[1088,5822,5823],{"class":1090,"line":1735},[1088,5824,5825],{"class":1122}," )\n",[1088,5827,5828],{"class":1090,"line":1746},[1088,5829,1439],{"class":1142},[1088,5831,5832,5834],{"class":1090,"line":1760},[1088,5833,5747],{"class":1122},[1088,5835,5751],{"class":5750},[1088,5837,5838,5840,5843],{"class":1090,"line":1780},[1088,5839,1444],{"class":1114},[1088,5841,5842],{"class":4008}," batch_data_migration",[1088,5844,4117],{"class":1122},[1088,5846,5847,5849,5852],{"class":1090,"line":1789},[1088,5848,5765],{"class":3548},[1088,5850,5851],{"class":3554},"Example of processing data in batches",[1088,5853,4033],{"class":3548},[1088,5855,5856],{"class":1090,"line":1856},[1088,5857,3858],{"class":1142},[1088,5859,5860,5863,5866,5868,5870,5872,5874],{"class":1090,"line":1886},[1088,5861,5862],{"class":1114}," def",[1088,5864,5865],{"class":4008}," update_posts_in_batches",[1088,5867,1123],{"class":1122},[1088,5869,4015],{"class":4014},[1088,5871,1217],{"class":1122},[1088,5873,4020],{"class":4014},[1088,5875,1136],{"class":1122},[1088,5877,5878,5881,5883,5885,5887,5889,5891,5893,5895,5897,5899,5901,5903,5905],{"class":1090,"line":1916},[1088,5879,5880],{"class":1142}," Post ",[1088,5882,1146],{"class":1122},[1088,5884,4043],{"class":1142},[1088,5886,1130],{"class":1122},[1088,5888,4048],{"class":1154},[1088,5890,1123],{"class":1122},[1088,5892,1769],{"class":1768},[1088,5894,2436],{"class":1772},[1088,5896,1769],{"class":1768},[1088,5898,1217],{"class":1122},[1088,5900,2419],{"class":1768},[1088,5902,1978],{"class":1772},[1088,5904,1769],{"class":1768},[1088,5906,1170],{"class":1122},[1088,5908,5909],{"class":1090,"line":1946},[1088,5910,5911],{"class":1142}," \n",[1088,5913,5914,5917,5919],{"class":1090,"line":1952},[1088,5915,5916],{"class":1142}," batch_size ",[1088,5918,1146],{"class":1122},[1088,5920,5921],{"class":1166}," 1000\n",[1088,5923,5924,5927,5929,5931,5933,5935,5937,5940],{"class":1090,"line":1958},[1088,5925,5926],{"class":1142}," total_posts ",[1088,5928,1146],{"class":1122},[1088,5930,1119],{"class":1142},[1088,5932,1130],{"class":1122},[1088,5934,4109],{"class":1470},[1088,5936,1130],{"class":1122},[1088,5938,5939],{"class":1154},"count",[1088,5941,1188],{"class":1122},[1088,5943,5944,5947,5949],{"class":1090,"line":1969},[1088,5945,5946],{"class":1142}," processed ",[1088,5948,1146],{"class":1122},[1088,5950,5951],{"class":1166}," 0\n",[1088,5953,5954],{"class":1090,"line":1985},[1088,5955,5911],{"class":1142},[1088,5957,5958,5961,5964,5968,5971],{"class":1090,"line":1992},[1088,5959,5960],{"class":1323}," while",[1088,5962,5963],{"class":1142}," processed ",[1088,5965,5967],{"class":5966},"sVsLi","\u003C",[1088,5969,5970],{"class":1142}," total_posts",[1088,5972,3543],{"class":1122},[1088,5974,5975,5978,5980,5982,5984,5986,5988,5990,5993,5996,5998,6001,6004,6007],{"class":1090,"line":2049},[1088,5976,5977],{"class":1142}," posts ",[1088,5979,1146],{"class":1122},[1088,5981,1119],{"class":1142},[1088,5983,1130],{"class":1122},[1088,5985,4109],{"class":1470},[1088,5987,1130],{"class":1122},[1088,5989,4114],{"class":1154},[1088,5991,5992],{"class":1122},"()[",[1088,5994,5995],{"class":1142},"processed",[1088,5997,4910],{"class":1122},[1088,5999,6000],{"class":1142},"processed ",[1088,6002,6003],{"class":5966},"+",[1088,6005,6006],{"class":1142}," batch_size",[1088,6008,6009],{"class":1122},"]\n",[1088,6011,6012],{"class":1090,"line":2079},[1088,6013,6014],{"class":1142}," \n",[1088,6016,6017,6020,6022,6024,6027],{"class":1090,"line":2102},[1088,6018,6019],{"class":1323}," for",[1088,6021,4099],{"class":1142},[1088,6023,4102],{"class":1323},[1088,6025,6026],{"class":1142}," posts",[1088,6028,3543],{"class":1122},[1088,6030,6031],{"class":1090,"line":2131},[1088,6032,6033],{"class":1094}," # Perform update operation\n",[1088,6035,6036,6039,6041,6043,6045,6047,6049,6051,6053,6055],{"class":1090,"line":2194},[1088,6037,6038],{"class":1142}," post",[1088,6040,1130],{"class":1122},[1088,6042,3794],{"class":1470},[1088,6044,4129],{"class":1122},[1088,6046,4132],{"class":1154},[1088,6048,1123],{"class":1122},[1088,6050,2488],{"class":1154},[1088,6052,1130],{"class":1122},[1088,6054,2056],{"class":1470},[1088,6056,1170],{"class":1122},[1088,6058,6059,6061,6063,6065],{"class":1090,"line":2199},[1088,6060,6038],{"class":1142},[1088,6062,1130],{"class":1122},[1088,6064,4151],{"class":1154},[1088,6066,1188],{"class":1122},[1088,6068,6069],{"class":1090,"line":2204},[1088,6070,6014],{"class":1142},[1088,6072,6073,6076,6079],{"class":1090,"line":2955},[1088,6074,6075],{"class":1142}," processed ",[1088,6077,6078],{"class":1122},"+=",[1088,6080,6081],{"class":1142}," batch_size\n",[1088,6083,6084,6087,6089,6092,6095,6099,6101,6104,6107,6109,6112,6114,6117],{"class":1090,"line":2972},[1088,6085,6086],{"class":1447}," print",[1088,6088,1123],{"class":1122},[1088,6090,6091],{"class":1114},"f",[1088,6093,6094],{"class":1772},"\"Processed ",[1088,6096,6098],{"class":6097},"s3h35","{",[1088,6100,5995],{"class":1154},[1088,6102,6103],{"class":6097},"}",[1088,6105,6106],{"class":1772},"/",[1088,6108,6098],{"class":6097},[1088,6110,6111],{"class":1154},"total_posts",[1088,6113,6103],{"class":6097},[1088,6115,6116],{"class":1772}," posts\"",[1088,6118,1170],{"class":1122},[1088,6120,6121],{"class":1090,"line":2978},[1088,6122,3858],{"class":1142},[1088,6124,6125,6127,6129,6131,6133],{"class":1090,"line":3002},[1088,6126,1461],{"class":1323},[1088,6128,1651],{"class":1142},[1088,6130,1130],{"class":1122},[1088,6132,3954],{"class":1154},[1088,6134,1757],{"class":1122},[1088,6136,6137,6139,6141,6144],{"class":1090,"line":3017},[1088,6138,3961],{"class":1160},[1088,6140,1146],{"class":1122},[1088,6142,6143],{"class":1154},"update_posts_in_batches",[1088,6145,1777],{"class":1122},[1088,6147,6148,6150,6152,6154,6156,6158,6160,6162],{"class":1090,"line":3048},[1088,6149,3973],{"class":1160},[1088,6151,1146],{"class":1122},[1088,6153,1024],{"class":1154},[1088,6155,1130],{"class":1122},[1088,6157,3954],{"class":1470},[1088,6159,1130],{"class":1122},[1088,6161,3986],{"class":1470},[1088,6163,1777],{"class":1122},[1088,6165,6166],{"class":1090,"line":3079},[1088,6167,5825],{"class":1122},[1088,6169,6170],{"class":1090,"line":3102},[1088,6171,1102],{"emptyLinePlaceholder":1101},[1088,6173,6174],{"class":1090,"line":3107},[1088,6175,6176],{"class":1094},"# Example of a production-ready migration\n",[1088,6178,6179,6181,6184,6186,6188,6190,6192],{"class":1090,"line":3113},[1088,6180,1115],{"class":1114},[1088,6182,6183],{"class":1118}," ProductionMigration",[1088,6185,1123],{"class":1122},[1088,6187,1024],{"class":1126},[1088,6189,1130],{"class":1122},[1088,6191,1698],{"class":1126},[1088,6193,1136],{"class":1122},[1088,6195,6196],{"class":1090,"line":3130},[1088,6197,3549],{"class":3548},[1088,6199,6200],{"class":1090,"line":3139},[1088,6201,6202],{"class":3554}," Production migration with safety checks and performance optimizations\n",[1088,6204,6205],{"class":1090,"line":3161},[1088,6206,3549],{"class":3548},[1088,6208,6209],{"class":1090,"line":3166},[1088,6210,1439],{"class":1142},[1088,6212,6213,6215,6217],{"class":1090,"line":3171},[1088,6214,1722],{"class":1142},[1088,6216,1146],{"class":1122},[1088,6218,1743],{"class":1122},[1088,6220,6221,6223,6225,6227,6229,6231,6233,6236,6238],{"class":1090,"line":3180},[1088,6222,2407],{"class":1122},[1088,6224,1769],{"class":1768},[1088,6226,2436],{"class":1772},[1088,6228,1769],{"class":1768},[1088,6230,1217],{"class":1122},[1088,6232,2419],{"class":1768},[1088,6234,6235],{"class":1772},"0005_previous_migration",[1088,6237,1769],{"class":1768},[1088,6239,2427],{"class":1122},[1088,6241,6242],{"class":1090,"line":3192},[1088,6243,2207],{"class":1122},[1088,6245,6246],{"class":1090,"line":3207},[1088,6247,1439],{"class":1142},[1088,6249,6250,6252,6254],{"class":1090,"line":3222},[1088,6251,1738],{"class":1142},[1088,6253,1146],{"class":1122},[1088,6255,1743],{"class":1122},[1088,6257,6258],{"class":1090,"line":3245},[1088,6259,6260],{"class":1094}," # Add field as nullable first\n",[1088,6262,6263,6265,6267,6269],{"class":1090,"line":3250},[1088,6264,1749],{"class":1142},[1088,6266,1130],{"class":1122},[1088,6268,2474],{"class":1154},[1088,6270,1757],{"class":1122},[1088,6272,6273,6275,6277,6279,6281,6283],{"class":1090,"line":4971},[1088,6274,2481],{"class":1160},[1088,6276,1146],{"class":1122},[1088,6278,1769],{"class":1768},[1088,6280,2488],{"class":1772},[1088,6282,1769],{"class":1768},[1088,6284,1777],{"class":1122},[1088,6286,6287,6289,6291,6293,6296,6298],{"class":1090,"line":4976},[1088,6288,1763],{"class":1160},[1088,6290,1146],{"class":1122},[1088,6292,1769],{"class":1768},[1088,6294,6295],{"class":1772},"featured_image",[1088,6297,1769],{"class":1768},[1088,6299,1777],{"class":1122},[1088,6301,6302,6304,6306,6308,6310,6313],{"class":1090,"line":4982},[1088,6303,2512],{"class":1160},[1088,6305,1146],{"class":1122},[1088,6307,1127],{"class":1154},[1088,6309,1130],{"class":1122},[1088,6311,6312],{"class":1154},"ImageField",[1088,6314,1757],{"class":1122},[1088,6316,6317,6320,6322,6324,6327,6329],{"class":1090,"line":5023},[1088,6318,6319],{"class":1160}," upload_to",[1088,6321,1146],{"class":1122},[1088,6323,1769],{"class":1768},[1088,6325,6326],{"class":1772},"posts/featured/",[1088,6328,1769],{"class":1768},[1088,6330,1777],{"class":1122},[1088,6332,6333,6335,6337,6339],{"class":1090,"line":5028},[1088,6334,4502],{"class":1160},[1088,6336,1146],{"class":1122},[1088,6338,1407],{"class":1406},[1088,6340,1777],{"class":1122},[1088,6342,6343,6345,6347],{"class":1090,"line":5034},[1088,6344,4513],{"class":1160},[1088,6346,1146],{"class":1122},[1088,6348,4518],{"class":1406},[1088,6350,6351],{"class":1090,"line":5040},[1088,6352,4523],{"class":1122},[1088,6354,6355],{"class":1090,"line":5058},[1088,6356,1955],{"class":1122},[1088,6358,6359],{"class":1090,"line":5067},[1088,6360,3858],{"class":1142},[1088,6362,6363],{"class":1090,"line":5078},[1088,6364,6365],{"class":1094}," # Create index concurrently (PostgreSQL)\n",[1088,6367,6368,6370,6372,6374],{"class":1090,"line":5093},[1088,6369,1749],{"class":1142},[1088,6371,1130],{"class":1122},[1088,6373,5785],{"class":1154},[1088,6375,1757],{"class":1122},[1088,6377,6378,6380,6382,6384,6387],{"class":1090,"line":5109},[1088,6379,5792],{"class":1160},[1088,6381,1146],{"class":1122},[1088,6383,5797],{"class":1768},[1088,6385,6386],{"class":1772},"CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_post_featured ",[1088,6388,6389],{"class":1768},"\"\n",[1088,6391,6392,6395,6398,6400],{"class":1090,"line":5141},[1088,6393,6394],{"class":1768}," \"",[1088,6396,6397],{"class":1772},"ON blog_post(featured_image) WHERE featured_image IS NOT NULL;",[1088,6399,5797],{"class":1768},[1088,6401,1777],{"class":1122},[1088,6403,6404,6406,6408,6410,6413,6415],{"class":1090,"line":5146},[1088,6405,5809],{"class":1160},[1088,6407,1146],{"class":1122},[1088,6409,5797],{"class":1768},[1088,6411,6412],{"class":1772},"DROP INDEX IF EXISTS idx_post_featured;",[1088,6414,5797],{"class":1768},[1088,6416,1777],{"class":1122},[1088,6418,6419,6422],{"class":1090,"line":5151},[1088,6420,6421],{"class":1160}," state_operations",[1088,6423,1786],{"class":1122},[1088,6425,6426,6429,6431,6434],{"class":1090,"line":5156},[1088,6427,6428],{"class":1154}," migrations",[1088,6430,1130],{"class":1122},[1088,6432,6433],{"class":1154},"AddIndex",[1088,6435,1757],{"class":1122},[1088,6437,6438,6441,6443,6445,6447,6449],{"class":1090,"line":5162},[1088,6439,6440],{"class":1160}," model_name",[1088,6442,1146],{"class":1122},[1088,6444,1769],{"class":1768},[1088,6446,2488],{"class":1772},[1088,6448,1769],{"class":1768},[1088,6450,1777],{"class":1122},[1088,6452,6453,6456,6458,6460,6462,6465],{"class":1090,"line":5180},[1088,6454,6455],{"class":1160}," index",[1088,6457,1146],{"class":1122},[1088,6459,1127],{"class":1154},[1088,6461,1130],{"class":1122},[1088,6463,6464],{"class":1154},"Index",[1088,6466,1757],{"class":1122},[1088,6468,6469,6472,6475,6477,6479,6481],{"class":1090,"line":5189},[1088,6470,6471],{"class":1160}," fields",[1088,6473,6474],{"class":1122},"=[",[1088,6476,1769],{"class":1768},[1088,6478,6295],{"class":1772},[1088,6480,1769],{"class":1768},[1088,6482,6483],{"class":1122},"],\n",[1088,6485,6486,6489,6491,6493,6496,6498],{"class":1090,"line":5211},[1088,6487,6488],{"class":1160}," name",[1088,6490,1146],{"class":1122},[1088,6492,1769],{"class":1768},[1088,6494,6495],{"class":1772},"idx_post_featured",[1088,6497,1769],{"class":1768},[1088,6499,1777],{"class":1122},[1088,6501,6502,6505,6507,6509,6511,6514,6516,6519,6521,6523],{"class":1090,"line":5216},[1088,6503,6504],{"class":1160}," 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migrations\n",[1088,6557,6558,6561,6563],{"class":1090,"line":5280},[1088,6559,6560],{"class":1142}," atomic ",[1088,6562,1146],{"class":1122},[1088,6564,6565],{"class":1406}," False\n",[1026,6567,6568],{},"Django migrations provide a robust system for managing database schema evolution. 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