new_contents: # -*- coding: utf-8 -*-
  # Generated by Django 1.11.5 on 2017-11-02 09:45
  from __future__ import unicode_literals
  
  from django.db import migrations
  from django.db.transaction import atomic
  from django.db.utils import IntegrityError
  
  
  def add_subscriptions_for_memberships(apps, schema_editor):
      ContentType = apps.get_model('contenttypes', 'ContentType')
      Membership = apps.get_model('memberships', 'Membership')
      Subscription = apps.get_model('subscriptions', 'Subscription')
      for membership in Membership.objects.all():
          try:
              with atomic():
                  Subscription.objects.create(
                          subscribed_to_id=membership.group.id,
                          subscribed_to_type=ContentType.objects.get_for_model(membership.group),
                          subscriber=membership.member)
          except IntegrityError:
              pass
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('memberships', '0014_auto_20170609_1029'),
          ('subscriptions', '0013_auto_20170918_1340'),
      ]
  
      operations = [
          migrations.RunPython(add_subscriptions_for_memberships),
      ]
  
subject: Add subscriptions for all memberships