south does not update model permissions

[alan.kesselmann@…]

Hello

i have encountered a problem when south updates database only when model itself has changed - but when you only change its (models) permissions, then those do not get updated.

My setup:
INSTALLED_APPS = (

'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'django.contrib.messages',
'django.contrib.staticfiles',
'django.contrib.admin',
'cms', #django-cms apps start
'cms.plugins.text',
'cms.plugins.picture',
'cms.plugins.link',
'cms.plugins.file',
'cms.plugins.snippet',
'cms.plugins.googlemap',
'menus',
'mptt',
'publisher', #django-cms apps end
'south', #database schema migrations
'guardian', #object based permissions
'rosetta', #.po files translations

and so on...

setup includes 'guardian' which is ​https://github.com/lukaszb/django-guardian - this i use for object based permissions, but since my permissions are set up exactly like django wants them to be (​https://docs.djangoproject.com/en/dev/ref/models/options/#permissions), then i dont think the case is related to 'guardian' app. Moreover - after talking to guardians creator he says that he has not encountered that problem when using django's own syncdb.

How to reproduce the problem:

1. Create model. Add few fields and few permissions.
2. run python manage.py schemamigration yourapp --initial
3. run python manage.py migrate yourapp
4. tables were created, columns were added and rows were added to auth_permission table
5. add few more fields/columns to your previously created model
6. add few more permissions
7. run python manage.py schemamigration yourapp --auto & python manage.py migrate yourapp
8. again - new fields were created and new auth_permission table rows were created - so far so good
9. this time add just new permissions - make no other changes to your model.
10. run python manage.py schemamigration yourapp --auto and you get :
11. Nothing seems to have changed.
12. run python manage.py migrate yourapp 13.
13. Running migrations for yourapp:
14. - Nothing to migrate.
15. - Loading initial data for yourapp.
16. No fixtures found.
17. no new rows were created in auth_permissions table
18. python manage.py syncdb does not do anything either

Alan

[andrew]

Duplicate of #211.