# 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)