channel-folders: Add order field and backfill it alphabetically.

zerver/migrations/0748_channelfolder_add_order.py

@@ -0,0 +1,42 @@
+# Generated by Django 5.2.4 on 2025-08-05 08:53
+
+from django.db import migrations, models
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
+from django.db.migrations.state import StateApps
+from django.db.models.functions import Lower
+
+
+def migrate_set_order_value(apps: StateApps, schema_editor: BaseDatabaseSchemaEditor) -> None:
+    Realm = apps.get_model("zerver", "Realm")
+    ChannelFolder = apps.get_model("zerver", "ChannelFolder")
+
+    realms = Realm.objects.all()
+
+    for realm in realms:
+        channel_folders = list(
+            ChannelFolder.objects.filter(realm_id=realm.id)
+            .annotate(lower_name=Lower("name"))
+            .order_by("lower_name")
+        )
+
+        for index, folder in enumerate(channel_folders):
+            folder.order = index
+
+        ChannelFolder.objects.bulk_update(channel_folders, ["order"])
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("zerver", "0747_realmcreationstatus"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="channelfolder",
+            name="order",
+            field=models.IntegerField(default=0),
+        ),
+        migrations.RunPython(
+            migrate_set_order_value, reverse_code=migrations.RunPython.noop, elidable=True
+        ),
+    ]