python - Django : Calling the authenticate method of a class that inherits from RemoteUserBackend -

i having difficulty customizing djangos authentication system. in scenario there no database , authentication happens through http request. there no tables read or write from.

this thread here deals pretty same case dealing not understand how user being created in example. read this django manual regarding remote_user authentication.coming first link user posted code here.it consists of backend , user object

backend - inherit remoteuserbackend

from django.contrib.auth.backends import remoteuserbackend  class myremoteuserbackend (remoteuserbackend):     # create user object if not in database?     create_unknown_user = false      def get_user (self, user_id):         user = somehow_create_an_instance_of (myuser, user_id)    ---->a         return user      def authenticate (self, **credentials):         check_credentials ()         user = somehow_create_an_instance_of (myuser, credentials) ---->b         return user 

then user:

from django.contrib.auth.models import user  class myuser (user):      def save (self):         """saving db disabled"""         pass      objects = none # cannot use w/o local db      username = ""  # , other properties likewise.                    # they're defined model.charfield or similar,                    # , can't allow      def get_group_permissions (self):         """if don't make own permissions module,            default use db. throw away"""         return [] # likewise other permission defs      def get_and_delete_messages (self):         """messages stored in db. darn!"""         return [] 

now question in view

def my_view(request):     username = request.post['username']     password = request.post['password']     user = authenticate(username=username, password=password)     if user not none:         if user.is_active:             login(request, user) 

now how can have authenticate method myremoteuserbackend called in above code snippet , snippet mean somehow_create_an_instance_of suggestions on great