Wouldn't it be possible to implement case-insensitive usernames without
loosing backwards compatibility, by checking the username iexact and only
if there are multiple possibilities fall back to the old case-sensitive
variant?
So something like this:
diff --git a/django/contrib/auth/base_user.py
b/django/contrib/auth/base_user.py
index 34dd6ac2f2..748db8bf89 100644
--- a/django/contrib/auth/base_user.py
+++ b/django/contrib/auth/base_user.py
@@ -4,6 +4,7 @@ not in INSTALLED_APPS.
"""
import unicodedata
+from django.core.exceptions import MultipleObjectsReturned
from django.contrib.auth import password_validation
from django.contrib.auth.hashers import (
check_password, is_password_usable, make_password,
@@ -41,7 +42,14 @@ class BaseUserManager(models.Manager):
return get_random_string(length, allowed_chars)
def get_by_natural_key(self, username):
- return self.get(**{self.model.USERNAME_FIELD: username})
+ username_field = self.model.USERNAME_FIELD
+
+ # Try case-insensitive match of username.
+ # If there are multiple possiblities fallback to case-sensitive
lookup
+ try:
+ return self.get(**{username_field + '__iexac': username})
+ except MultipleObjectsReturned:
+ return self.get(**{username_field: username})
class AbstractBaseUser(models.Model):
--
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