Why aren't groups populated automatically after a Django migration?

Question

Django

The task is to automatically create groups after starting the project and add the list of permissions.

The implementation is the post_migrate signal. That is, after each migration, create groups and a list of permissions

Questions:
1) Why does this code work:

@receiver(post_migrate)
def populate_models(sender, **kwargs):
    print('Populating groups....')
....

and this one doesn't?

@receiver(post_migrate, sender=apps.BoardConfig)
def populate_models(sender, **kwargs):
    print('Populating groups....')
....

After migrate, in the first case, the code is executed 5 times, and in the code below, the code is not executed at all. Did I specify sender incorrectly?

I know about putting connect() into ready(), but I want to use @receiverand isolate signals in a separate file

2) Is signaling the best way to implement the task? Something tells me that it's wrong to run this code after every migration.

Answer 1

The sender is the config object and not the config class. And the optimal implementation is highly dependent on the context.