python - django extended built in user model not allowing to login in admin -

i using django 1.8 app , using postgresql.i have created super user , can login admin panel after configuring postgresql settings in settings.py file.but after i have decided extend django built in user model , thats why have created new app namely authentication , wrote model

from django.db import models django.contrib.auth.models import abstractbaseuser django.contrib.auth.models import baseusermanager   class accountmanager(baseusermanager):     def create_user(self, email, password=none, **kwargs):         if not email:             raise valueerror('users must have valid email address.')          if not kwargs.get('username'):             raise valueerror('users must have valid username.')          account = self.model(             email=self.normalize_email(email), username=kwargs.get('username')         )          account.set_password(password)         account.save()          return account      def create_superuser(self, email, password, **kwargs):         account = self.create_user(email, password, **kwargs)         account.is_admin = true         account.save()          return account   class account(abstractbaseuser):     email = models.emailfield(unique=true)     username = models.charfield(max_length=40, unique=true)      first_name = models.charfield(max_length=40, blank=true)     last_name = models.charfield(max_length=40, blank=true)     tagline = models.charfield(max_length=140, blank=true)      is_admin = models.booleanfield(default=false)      created_at = models.datetimefield(auto_now_add=true)     updated_at = models.datetimefield(auto_now=true)      objects = accountmanager()      username_field = 'email'     required_fields = ['username']      def __unicode__(self):         return self.email      def get_full_name(self):         return ' '.join([self.first_name, self.last_name])      def get_short_name(self):         return self.first_name  

and have migrated after adding new line in settings.py is

auth_user_model = 'authentication.account' 

but after can't able login admin.

to solve this,i have created superuser newly created account model.but problem hasn't been solved.

to test whats going wrong,i have commented out auth_user_model = 'authentication.account' this

#auth_user_model = 'authentication.account' 

and allowing me login admin old username , password have set when have configured postgresql , create superuser.

edit after creating superuser account model,i trying login admin, giving newly created email address username , new password,but facing following error

attributeerror @ /admin/login/ 'account' object has no attribute 'is_staff' 

to have user model suitable use django admin, need extend abstractuser - abstract base class implementing featured user model admin-compliant permissions.

https://github.com/django/django/blob/master/django/contrib/auth/models.py#l293

or add additional fields model. @ least need is_active , is_staff