# Generated by Django 3.2.13 on 2022-06-28 12:02

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


def set_default_value_for_can_remove_subscribers_group(
    apps: StateApps, schema_editor: BaseDatabaseSchemaEditor
) -> None:
    Stream = apps.get_model("zerver", "Stream")
    Realm = apps.get_model("zerver", "Realm")
    UserGroup = apps.get_model("zerver", "UserGroup")

    for realm in Realm.objects.all():
        admins_group = UserGroup.objects.get(
            name="@role:administrators", realm=realm, is_system_group=True
        )
        Stream.objects.filter(realm=realm, can_remove_subscribers_group=None).update(
            can_remove_subscribers_group=admins_group
        )


class Migration(migrations.Migration):

    dependencies = [
        ("zerver", "0408_stream_can_remove_subscribers_group"),
    ]

    operations = [
        migrations.RunPython(
            set_default_value_for_can_remove_subscribers_group,
            elidable=True,
            reverse_code=migrations.RunPython.noop,
        ),
    ]

Add migration to set default of can_remove_subscribers_group.
migrations: Add migration to set default of can_remove_subscribers_group.

This migration sets can_remove_subscribers_group value to admins system
group for all the existing streams. In further commit we would change
can_remove_subscribers_group to be not null and thus we add this migration
to ensure all existing streams have this setting value set.
