custom email authentication backend not working in django 2.1.4

Question

I am having trouble in integrating custom authentication backend in django 2.1.4 . Following is my code :
my FMS.authBackend module :

from django.contrib.auth import get_user_model
from django.contrib.auth.backends import ModelBackend

class authEmailBackend(ModelBackend):
    def authenticate(self, username=None, password=None, **kwargs):
        print("aaaaaaa")
        UserModel = get_user_model()
        try:
            user = UserModel.objects.get(email=username)
        except UserModel.DoesNotExist:
            return None
        else:
            if user.check_password(password):
                return user
        return None

my settings.py :

AUTHENTICATION_BACKENDS = (
                'FMS.authBackend.authEmailBackend',
                'django.contrib.auth.backends.ModelBackend',

                )

my urls.py :

from django.contrib.auth import views as auth_views
urlpatterns = [ 
        path('login', my_decos.logout_required(auth_views.LoginView.as_view(template_name = 'register/login.html')),name = 'login')
]

The above code is not working in my case. Function authenticate in authEmailBackend is never called as nothing printed in console but I print statement in authenticate function.

although the same code was working for django 2.0.8 , the only difference then was that the urls.py was :

from django.contrib.auth import views as auth_views
urlpatterns = [ 
        path('login', my_decos.logout_required(auth_views.login(template_name = 'register/login.html')),name = 'login')
]

but in the newer django the django.contrib.auth.views.login doesn't support any more and we need to use django.contrib.auth.views.LoginView . I read somewhere that to use custom AUTHENTICATION_BACKEND our url must point to django.contrib.auth.views.login but which is not possible here.

So can you please help me to overcome the problem.

Answer 1

request argument need to pass to the authenticate method

  class authEmailBackend(ModelBackend):
        **def authenticate(self, request, username=None, password=None, **kwargs):**
            print("aaaaaaa")
            UserModel = get_user_model()
            try:
                user = UserModel.objects.get(email=username)
            except UserModel.DoesNotExist:
                return None
            else:
                if user.check_password(password):
                    return user
            return None