[Django]-Django: ValidationError using is_authenticated and logout when authenticating from an external source

I’m in a similar situation and seeing this error. For me the solution was to provide a value for the id attribute of the custom User class when creating the user object.

This allows the default login() function to work as it provides the value for the required primary key attribute.

My backend now looks something like this:

class CustomBackend(BaseBackend):
    def get_user(self, user_id):
        user = [...] # API call to get user data

        return CTUser(
            id=user_id, # <- added this
            username=user['cmsUserId'],
            email=user['email'],
            first_name=user['firstName'],
            last_name=user['lastName'],
        )

    def authenticate(self, request, username=None, password=None, **kwargs):
        userid = [...] # API call to authenticate and get user id

        user = self.get_user(userid)
        user.logintoken = password

        return user