926542 - [traceback] `./manage.py convert_to_south <appname>` blows up

Status: RESOLVED WONTFIX

(support.mozilla.org :: General, defect)

Description

[Ricky Rosario [:rrosario, :r1cky]]

Something with the post_migrate signal we added for creating permissions.

To reproduce:

    $ rm -rf kitsune/questions/migrations
    $ ./manage.py convert_to_south questions --delete-ghost-migrations

Creating migrations directory at '/Users/rlr/dev/kitsune/kitsune/questions/migrations'...
Creating __init__.py in '/Users/rlr/dev/kitsune/kitsune/questions/migrations'...
 + Added model questions.Question
 + Added M2M table for products on questions.Question
 + Added M2M table for topics on questions.Question
 + Added model questions.QuestionMetaData
 + Added unique constraint for ['question', 'name'] on questions.QuestionMetaData
 + Added model questions.QuestionVisits
 + Added model questions.Answer
 + Added model questions.QuestionVote
 + Added model questions.AnswerVote
 + Added model questions.VoteMetadata
Created 0001_initial.py. You can now apply this migration with: ./manage.py migrate questions
 - Soft matched migration 0001 to 0001_initial.
Running migrations for questions:
- Nothing to migrate.
 - Loading initial data for questions.
Installed 0 object(s) from 0 fixture(s)
Traceback (most recent call last):
  File "./manage.py", line 47, in <module>
    execute_manager(settings)
  File "/Users/rlr/dev/kitsune/vendor/src/django/django/core/management/__init__.py", line 459, in execute_manager
    utility.execute()
  File "/Users/rlr/dev/kitsune/vendor/src/django/django/core/management/__init__.py", line 382, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/rlr/dev/kitsune/vendor/src/django/django/core/management/base.py", line 196, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/Users/rlr/dev/kitsune/vendor/src/django/django/core/management/base.py", line 232, in execute
    output = self.handle(*args, **options)
  File "/Users/rlr/dev/kitsune/vendor/packages/South/south/management/commands/convert_to_south.py", line 89, in handle
    delete_ghosts=options.get("delete_ghosts", False),
  File "/Users/rlr/dev/kitsune/vendor/src/django/django/core/management/__init__.py", line 150, in call_command
    return klass.execute(*args, **defaults)
  File "/Users/rlr/dev/kitsune/vendor/src/django/django/core/management/base.py", line 232, in execute
    output = self.handle(*args, **options)
  File "/Users/rlr/dev/kitsune/vendor/packages/South/south/management/commands/migrate.py", line 111, in handle
    ignore_ghosts = ignore_ghosts,
  File "/Users/rlr/dev/kitsune/vendor/packages/South/south/migration/__init__.py", line 235, in migrate_app
    post_migrate.send(None, app=app_label)
  File "/Users/rlr/dev/kitsune/vendor/src/django/django/dispatch/dispatcher.py", line 172, in send
    response = receiver(signal=self, sender=sender, **named)
  File "/Users/rlr/dev/kitsune/kitsune/sumo/__init__.py", line 24, in update_permissions_after_migration
    get_app(app), get_models(), 2 if settings.DEBUG else 0)
  File "/Users/rlr/dev/kitsune/vendor/src/django/django/contrib/auth/management/__init__.py", line 35, in create_permissions
    ctype = ContentType.objects.get_for_model(klass)
  File "/Users/rlr/dev/kitsune/vendor/src/django/django/contrib/contenttypes/models.py", line 44, in get_for_model
    self._add_to_cache(self.db, ct)
  File "/Users/rlr/dev/kitsune/vendor/src/django/django/contrib/contenttypes/models.py", line 116, in _add_to_cache
    key = (model._meta.app_label, model._meta.object_name.lower())
AttributeError: 'NoneType' object has no attribute '_meta'

Comment 1

[Ricky Rosario [:rrosario, :r1cky]]

The initial migration is actually created successfully and works. This is just the signal handler that blows up once and you can just ignore it. So, Meh.

Comment 2

[Will Kahn-Greene [:willkg] ET needinfo? me]

When we switch to Django 1.7 and thus ditch South in the very very near future, then this becomes a non-issue.

I'm going to close this as WONTFIX.