from django.contrib.auth.backends import ModelBackend

from django.db.models import Q

from .models import UserProfile

class CustomBackend(ModelBackend):

    def authenticate(self, username=None, password=None, **kwargs):

        try:

            user =UserProfile.objects.get(Q(username=username)|Q(email=username))

            if user.check_password(password):

                return  user

        except Exception as e:

            return None

AUTHENTICATION_BACKENDS = (

    'users.views.CustomBackend',

)