Django-rest-framework: TokenProxy can't be proxy model when Token is abstract model

[kalekseev]

This is a followup of https://github.com/encode/django-rest-framework/pull/7341#issuecomment-666108668 discussion

Token become abstract if rest_framework.authtoken not in settings.INSTALLED_APPS . For example django-rest-auth imports rest_framework.authtoken.models.Token as default value but if project provides its own token model then rest_framework.authtoken not required in INSTALLED_APPS. Same thing will happen if someone needs a CustomToken that extends Token in that case he wants Token model to be abstract.

Checklist

• [x] I have verified that that issue exists against the master branch of Django REST framework.
• [x] I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• [x] This is not a usage question. (Those should be directed to the discussion group instead.)
• [x] This cannot be dealt with as a third party library. (We prefer new functionality to be in the form of third party libraries where possible.)
• [x] I have reduced the issue to the simplest possible case.
• [ ] I have included a failing test as a pull request. (If you are unable to do so we can still accept the issue.)

Steps to reproduce

Import rest_framework.authtoken.models while 'rest_framework.authtoken' not in settings.INSTALLED_APPS.

[carltongibson]

Thanks @kalekseev!

[carltongibson]

First guess, making TokenProxy proxy depend on whether 'rest_framework.authtoken' is installed (to mirror the Token abstract behaviour) should™ solve this... 😬

    proxy = 'rest_framework.authtoken' in settings.INSTALLED_APPS

[kalekseev]

First guess, making TokenProxy proxy depend on whether 'rest_framework.authtoken' is installed (to mirror the Token abstract behaviour) should™ solve this... 😬

    proxy = 'rest_framework.authtoken' in settings.INSTALLED_APPS

TokenProxy should be abstract too

proxy = 'rest_framework.authtoken' in settings.INSTALLED_APPS
abstract  = 'rest_framework.authtoken' not in settings.INSTALLED_APPS

A radical solution could be:

if 'rest_framework.authtoken' in settings.INSTALLED_APPS:
    class TokenProxy:
        ...

[4k45hv3rm4]

I m facing same issue while deploying the qeb app to ec2 instance, can someone tell wat is the solution? I have used djoser module for authentication

[terencehonles]

I basically arrived at the if/else solution suggested above and I submitted it for review. I think right now either #7571 or #7584 will fix the issue if anyone needs a quick fix and doesn't want to add authtoken into their installed apps.

[rahulkp220]

Still facing this error while using djoser.
Had to add rest_framework.authtoken in INSTALLED_APPS

[ovidiuc]

I'm also facing this issue, after upgrading from 3.11.0. The error is Abstract base class containing model fields not permitted for proxy model 'TokenProxy'., which is triggered by https://github.com/st4lk/django-rest-social-auth/blob/996a1c5f431defac8d5def96683ad1413499ec2e/rest_social_auth/serializers.py#L6

Adding rest_framework.authtoken in INSTALLED_APPS does not help. Is there anything that other packages, like rest_social_auth, need to change to make it work?

My specific error message is on #7561, which is marked as duplicate to this issue.