# Generated by Django 1.11.5 on 2017-10-19 22:01

import django.db.models.deletion
from django.db import migrations, models
from django.db.backends.postgresql.schema import DatabaseSchemaEditor
from django.db.migrations.state import StateApps


def set_initial_value_for_signup_notifications_stream(
        apps: StateApps, schema_editor: DatabaseSchemaEditor) -> None:
    realm_model = apps.get_model("zerver", "Realm")
    realms = realm_model.objects.exclude(notifications_stream__isnull=True)
    for realm in realms:
        realm.signup_notifications_stream = realm.notifications_stream
        realm.save(update_fields=["signup_notifications_stream"])

class Migration(migrations.Migration):

    dependencies = [
        ('zerver', '0120_botuserconfigdata'),
    ]

    operations = [
        migrations.AddField(
            model_name='realm',
            name='signup_notifications_stream',
            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='+', to='zerver.Stream'),
        ),
        migrations.RunPython(set_initial_value_for_signup_notifications_stream,
                             reverse_code=migrations.RunPython.noop,
                             elidable=True),
    ]