post_migrate documentation example is wrong

[Rudolph Froger]

The example in the documentation ​https://docs.djangoproject.com/en/dev/ref/signals/#post-migrate does not work, it's probably copied from the old post_syncdb docs. One needs to pass the AppConfig instance, so the example should read:

from django.db.models.signals import post_migrate
from django.apps import apps

def my_callback(sender, **kwargs):
    # Your specific logic here
    pass

post_migrate.connect(my_callback, sender=apps.get_app_config('yourapp'))

[Simon Charette]

LGTM

[Tim Graham <timograham@…>]

In a00efa30d6e5ca220b914415904fff5fa0a6f2c5:

Fixed #22748 -- Corrected post_migrate usage example.

Thanks Rudolph for the report.

[Tim Graham <timograham@…>]

In 170255caf43f2d0ae072f0b7a22da90f50bd95b0:

[1.7.x] Fixed #22748 -- Corrected post_migrate usage example.

Thanks Rudolph for the report.

Backport of a00efa30d6 from master