How to enable login for a custom written authentication backend

[Kireeti]

Hello Django Team, Thanks for creating such powerful framework and making it open. For one of my projects i wanted to let users login with OTP, for which i am doing the verification manually. I want to use the login() to let the user login to his account, order products. For which i created my own backend to query the model with the phone number all this part until authenticate is working fine. but i am not able to figure out how to use login from here. below is a snippet of what i created.

Backend:

from .models import Customer

class CustomerModelBackend(object):

def authenticate(self, phone_number=None, password=None):

try:

user = Customer.objects.get(phone=phone_number)
if user is not None:

return user

else:

return False

except user.DoesNotExist:

return False

def get_user(self, phone):

try:

return Customer.objects.get(pk=phone)

except Customer.DoesNotExist:

return None

Views.py
customer_backend = CustomerModelBackend()
customer_exist = customer_backend.authenticate(phone_number=phone)
login(request, customer_exist)

Here customer_exist is getting customer object as expected but login function is throwing global name not defined. importing login from contrib/auth is throwing backend not defined.

Someone please advice what to do.

Thanks.