first commit

backend/apps/farms/migrations/0011_flock_belongs_to_kandang.py

@@ -0,0 +1,45 @@
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+def backfill_flock_kandang_from_cycle(apps, schema_editor):
+    Flock = apps.get_model("farms", "Flock")
+    for flock in Flock.objects.select_related("cycle").iterator():
+        if flock.cycle_id and flock.kandang_id is None:
+            flock.kandang_id = flock.cycle.kandang_id
+            flock.save(update_fields=["kandang_id"])
+
+
+class Migration(migrations.Migration):
+    atomic = False
+
+    dependencies = [
+        ("farms", "0010_restore_flock_cycle_erd"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="flock",
+            name="kandang",
+            field=models.ForeignKey(
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="flocks",
+                to="farms.kandang",
+            ),
+        ),
+        migrations.RunPython(backfill_flock_kandang_from_cycle, migrations.RunPython.noop),
+        migrations.AlterField(
+            model_name="flock",
+            name="kandang",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="flocks",
+                to="farms.kandang",
+            ),
+        ),
+        migrations.RemoveField(
+            model_name="flock",
+            name="cycle",
+        ),
+    ]