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

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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

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backend django python
1 Answers

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
user_675790
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