Django login AttributeError: 'AnonymousUser' object has no attribute '_meta'

Question

I have this code:

 from django.contrib.auth import logout, login, authenticate
 ...
   if User.objects.filter(email=email).exists():
        existing_user = User.objects.get(email=email)

        user = authenticate(username=existing_user.username, password=existing_user.password)

        login(request, user)

According to the docs, this should work, but it doesn't, it gives me the error:

request.session[SESSION_KEY] = user._meta.pk.value_to_string(user) AttributeError: 'AnonymousUser' object has no attribute '_meta'

Maybe the problem happens becouse I am using JWT Authentication with Django Rest Framework? It is just an django-powered API, so I guess it is a different scenario, but I don't understand what could be causing the problem.

Show the full traceback. But your code makes no sense; authenticate is what gets the user, by comparing with the hashed password saved in the database. There is no point in getting the user separately, and here authenticate will always fail. — Daniel Roseman
– Daniel Roseman, Commented Jan 12, 2017 at 18:03
Hi @DanielRoseman . Then how can I login the user in the view without having its password at hand?. The app sends me a facebook token, I confirm the token with Fb's API, then, I get the email and check if it already exists (the rest is in the code I pasted), if the a user with that email exists, I need to login that user. I thought that using authenticate and login would solve it but now I see it doesn't. — Alejandro Veintimilla
– Alejandro Veintimilla, Commented Jan 12, 2017 at 18:21
You can implement your own Authentication Backend to authenticate user without password. There is an example with token authentication here - docs.djangoproject.com/en/1.10/topics/auth/customizing/… . — nmb.ten
– nmb.ten, Commented Jan 12, 2017 at 18:42
Or, use one of the third-party libraries that integrate Facebook login with Django: django-allauth or python-social-auth. — Daniel Roseman
– Daniel Roseman, Commented Jan 12, 2017 at 18:52

Raz · Accepted Answer · 2017-01-13 10:42:51Z

2

In DRF user should be authenticated inside Authentication class. This library provides one for JWT auth. It provides both token generation and verification.

You will get user as self.request.user in your View or ViewSet class. You just need to allow JWT auth:

class ExampleView(APIView):
    authentication_classes = (BasicAuthentication, JSONWebTokenAuthentication)

Or better set is as DEFAULT_AUTHENTICATION_CLASSES as documented here.

answered Jan 13, 2017 at 10:42

Raz

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