upstream-zulip/zerver/migrations/0033_migrate_domain_to_realmalias.py

from django.db import migrations
from django.db.backends.base.schema import BaseDatabaseSchemaEditor
from django.db.migrations.state import StateApps


def add_domain_to_realm_alias_if_needed(
    apps: StateApps, schema_editor: BaseDatabaseSchemaEditor
) -> None:
    Realm = apps.get_model("zerver", "Realm")
    RealmAlias = apps.get_model("zerver", "RealmAlias")

    for realm in Realm.objects.all().iterator():
        # if realm.domain already exists in RealmAlias, assume it is correct
        if not RealmAlias.objects.filter(domain=realm.domain).exists():
            RealmAlias.objects.create(realm=realm, domain=realm.domain)


class Migration(migrations.Migration):
    dependencies = [
        ("zerver", "0032_verify_all_medium_avatar_images"),
    ]

    operations = [
        migrations.RunPython(add_domain_to_realm_alias_if_needed, elidable=True),
    ]