new_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  
  try:
      # register a signal do update permissions every migration.
      # This is based on app django_extensions update_permissions command
      from south.signals import post_migrate
  
      def update_permissions_after_migration(app,**kwargs):
          """
          Update app permission just after every migration.
          This is based on app django_extensions update_permissions management command.
          """
          from django.conf import settings
          from django.db.models import get_app, get_models
          from django.contrib.auth.management import create_permissions
  
          create_permissions(get_app(app), get_models(), 2 if settings.DEBUG else 0)
  
      post_migrate.connect(update_permissions_after_migration)
  except ImportError:
      pass
subject: Add South post_migrate signal to work with permission changes