How to Authenticate with Email in Django without Sacrificing URL Compatibility?

Login with Email in Django: Alternatives to Using Usernames

Problem:

Customizing user authentication in Django from the default username-based approach to allow authentication via email presents challenges when URLs rely on usernames. The objective is to find an alternative method that does not compromise uniqueness or URL compatibility.

Solution:

To enable authentication using email without relying on usernames, Django applications can implement a custom authentication backend. This involves creating a class that inherits from Django's ModelBackend and overrides the authenticate method to perform authentication based on email addresses.

Here is a sample implementation:

<code class="python">from django.contrib.auth import get_user_model
from django.contrib.auth.backends import ModelBackend

class EmailBackend(ModelBackend):
    def authenticate(self, request, username=None, password=None, **kwargs):
        UserModel = get_user_model()
        try:
            user = UserModel.objects.get(email=username)
        except UserModel.DoesNotExist:
            return None
        else:
            if user.check_password(password):
                return user
        return None</code>

To configure Django to use this backend, add the following to settings.py:

<code class="python">AUTHENTICATION_BACKENDS = ['path.to.auth.module.EmailBackend']</code>

By implementing a custom authentication backend, Django applications can authenticate users based on email addresses, overcoming the limitations of the default username-based approach.

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