Preventing apps installing duplicate models

[Murat Sert]

Hi,

I'm working on a project upgrade from Django 1.8 to 1.11. They've used a custom registration app which is inheriting from Django Registration Redux package.
Both packages are listed on installed_apps list. All works fine however when I try to run tests, where it creates test tables back to back, it errors at the following lines:
```
    ....
    Creating table profile_preferences
    Creating table registration_registrationprofile
    Creating table registration_registrationprofile
    django.db.utils.ProgrammingError: relation "registration_registrationprofile" already exists
```

This is because both Apps are listed within the installed_apps list. Is there a way around this?

Removing the django-registration-redux from installed_apps causes ```RuntimeError: Model class registration.models.RegistrationProfile doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.``` error.


Regards

Murat

[Matemática A3K]

If you provide an app_label in the Model's Meta (whatever installed app), does it run?

 

Regards

Murat

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