Django doesn't provide a DB representation for AnonymousUser- Django rest api

Question

I tried to change password without the traditional way. Give old password and new password, update the old password. I used UpdateApiView.But i get the following error.

Django doesn't provide a DB representation for AnonymousUser

I tried passigng Authorization token in header using POST MAN. But Same error.

view.py

class ChangePassword(generics.UpdateAPIView):
    serializer_class = serializers.ChangePasswordSerializer
    model = models.Customer

    def get_object(self, queryset=None):
        obj = self.request.user
        return obj

    def update(self, request, *args, **kwargs):
        self.object = self.get_object()
        serializer = self.get_serializer(data=request.data)

        if serializer.is_valid():

            if not self.object.check_password(serializer.data.get("old_password")):
                return Response({"old_password": ["Wrong password."]}, status=HTTP_400_BAD_REQUEST)

            self.object.set_password(serializer.data.get("new_password"))
            self.object.save()
            return Response("Success.", status=HTTP_200_OK)

        return Response(serializer.errors, status=HTTP_400_BAD_REQUEST)

serializers.py

class ChangePasswordSerializer(serializers.Serializer):


    old_password = serializers.CharField(required=True)
    new_password = serializers.CharField(required=True)

urls.py

 path('update_password', views.ChangePassword.as_view()),

EDIT: I added TokenAuthentication in settings.py

REST_FRAMEWORK = {
    'DEFAULT_PERMISSION_CLASSES': (
        'rest_framework.permissions.IsAuthenticated',
    ),
    'DEFAULT_AUTHENTICATION_CLASSES': (
        'rest_framework.authentication.TokenAuthentication',
        'rest_framework.authentication.SessionAuthentication',
    )
}

In views.py, i added authentication_classes = (TokenAuthentication, )

Now i got name 'TokenAuthentication' is not defined

I imported TokenAuthentication in views.py

from rest_framework.authentication import SessionAuthentication, TokenAuthentication

But Django doesn't provide a DB representation for AnonymousUser.

Answer 1

Add the attribute authentication_classes = (TokenAuthentication, ) to ChangePassword view.