how to login a user with email or username in django custom user model

Question

This is my current code can anyone please add the required code to allow a user to login with email or username

backends.py

from django.contrib.auth import get_user_model from django.contrib.auth.backends import ModelBackend, UserModel class CaseInsensitiveModelBackend(ModelBackend): def authenticate(self, request, username=None, password=None, **kwargs): UserModel = get_user_model() if username is None: username = kwargs.get(UserModel.USERNAME_FIELD) try: case_insensitive_username_field = '{}__iexact'.format(UserModel.USERNAME_FIELD) user = UserModel._default_manager.get(**{case_insensitive_username_field: username}) except UserModel.DoesNotExist: UserModel().set_password(password) else: if user.check_password(password) and self.user_can_authenticate(user): return user

custom user models

Please include code, not images of code: see this question named Why not upload images of code errors when asking a question. Please edit the question and include code fragments. — willeM_ Van Onsem
– willeM_ Van Onsem, Commented Sep 12, 2021 at 18:41
I tried adding code, but he says most of my question is code, and he won't let me save the changes. — Saud Zubedi
– Saud Zubedi, Commented Sep 12, 2021 at 18:44

willeM_ Van Onsem · Accepted Answer · 2021-09-12 18:42:18Z

You can make a ModelBackend that will focus on retrieving the UserModel where the USERNAME_FIELD matches, or the email field matches with the __iexact lookup [Django-doc].

from django.contrib.auth import get_user_model def authenticate(self, request, username=None, password=None, **kwargs): UserModel = get_user_model() user_field = UserModel.USERNAME_FIELD if username is None: username = kwargs.get(UserModel.USERNAME_FIELD) try: case_insensitive_username_field = '{}__iexact'.format(UserModel.USERNAME_FIELD) user = UserModel._default_manager.get( Q((f'{user_field}__iexact', username)) | Q(username__iexact=username) ) except UserModel.DoesNotExist: UserModel().set_password(password) else: if user.check_password(password) and self.user_can_authenticate(user): return user

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