makemigrations doesn't create migrations package when app_label isn't specified

[dibrovsd]

in settings:

MIGRATION_MODULES = {
    'docflow': 'docflow_projects.migrations',
}

case 1) app docflow has no package "migrations"

• ./manage.py makemigrations

initial migration not create

case 2) app docflow has package "migrations"

• run "./manage.py makemigrations"

created initial migration in docflow_projects.migrations 0001_initial (ok)

• run "./manage.py makemigrations"

create migration deleted all field and models in app! 0002_auto_20141205_1349 (error)

• run "./manage.py makemigrations"

raise
CommandError: Conflicting migrations detected (0002_auto_20141205_1349, 0001_initial in docflow).

case 3)
run ./manage.py makemigrations docflow
it's ok

[Tim Graham]

It seems the fix for #22682 (allowing makemigrations to create the migrations package) only works if you specify the app_label. We should either update the documentation that was added as part of that ticket (in docs/ref/settings.txt) or see if we can make package creation happen when using makemigrations without an app_label.

I couldn't tell if there were any more problems besides that in your report. If so, a separate ticket may be appropriate.

[Carl Meyer]

I thought that until support for apps without migrations was removed, it was intentional that makemigrations would only create the migrations module if you gave it an app-label (I think that's the behavior with or without MIGRATION_MODULES set). Otherwise it would be very difficult to use migrated apps alongside unmigrated apps in the same project. I think the plan is in Django 1.9 (when support for unmigrated apps goes away), makemigrations should start always creating the migration module.

I'm not entirely sure about that, but that was my understanding. If that's the case, there still may be a documentation update needed.

[Tim Graham <timograham@…>]

In fa6e3a40e1866b64eb30e0dfbd43b340c0d831da:

Fixed #23961 -- Clarified when makemigrations will create a directory.

[Tim Graham <timograham@…>]

In da562d6a8785d28b75475c1c3d1eb5987253bc35:

[1.7.x] Fixed #23961 -- Clarified when makemigrations will create a directory.

Backport of fa6e3a40e1866b64eb30e0dfbd43b340c0d831da from master