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I am trying to add view_amodel permission to my models. I decided to add the permission after migration. So I made following approach.

At an_app/ init .py

from an_app.apps import MyAppConfig
default_app_config = MyAppConfig
At an_app/apps.py
from django.apps import AppConfig
from django.db.models.signals import post_migrate
from django.contrib.contenttypes.models import ContentType
from django.contrib.auth.models import Permission
def add_view_permissions(sender, **kwargs):
    This syncdb hooks takes care of adding a view permission too all our
    content types.
    # for each of our content types
    for content_type in ContentType.objects.all():
        # build our permission slug
        codename = "view_%s" % content_type.model
        # if it doesn't exist..
        if not Permission.objects.filter(content_type=content_type, codename=codename):
            # add it
            Permission.objects.create(content_type=content_type,
                                      codename=codename,
                                      name="Can view %s" % content_type.name)
            print "Added view permission for %s" % content_type.name
class MyAppConfig(AppConfig):
    def ready(self):
        post_migrate.connect(add_view_permissions, sender=self)
When I do python manage.py migrate, I get following error,
AttributeError: type object 'MyAppConfig' has no attribute 'rpartition'
How to solve it.

The reference to the AppConfig in the app's __init__.py is supposed to be a string, not the class itself.
Specify
default_app_config = 'an_app.apps.MyAppConfig'
and remove the import.
See the documentation.
        
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