[1.8.x] Fixed #24161 -- Stored the user primary key as a serialized value in the session.

This allows using a UUIDField primary key along with the JSON session
serializer.

Thanks to Trac alias jamesbeith for the report and Simon Charette
for the initial patch.

Backport of 0f7f5bc9e7a94ab91c2b3db29ef7cf000eff593f from master

3 files changed, 31 insertions, 3 deletions

diff --git a/tests/auth_tests/models/__init__.py b/tests/auth_tests/models/__init__.py
index edeaef5347..72afdf2358 100644
--- a/tests/auth_tests/models/__init__.py
+++ b/tests/auth_tests/models/__init__.py
@@ -5,9 +5,10 @@ from .invalid_models import (
     CustomUserBadRequiredFields,
 )
 from .with_foreign_key import CustomUserWithFK, Email
+from .uuid_pk import UUIDUser
 
 __all__ = (
     'CustomPermissionsUser', 'CustomUserNonUniqueUsername',
     'CustomUserNonListRequiredFields', 'CustomUserBadRequiredFields',
-    'CustomUserWithFK', 'Email', 'IsActiveTestUser1',
+    'CustomUserWithFK', 'Email', 'IsActiveTestUser1', 'UUIDUser',
 )
diff --git a/tests/auth_tests/models/uuid_pk.py b/tests/auth_tests/models/uuid_pk.py
new file mode 100644
index 0000000000..44ec4410aa
--- /dev/null
+++ b/tests/auth_tests/models/uuid_pk.py
@@ -0,0 +1,13 @@
+import uuid
+
+from django.contrib.auth.models import AbstractUser
+from django.contrib.auth.tests.custom_user import RemoveGroupsAndPermissions
+from django.db import models
+
+with RemoveGroupsAndPermissions():
+    class UUIDUser(AbstractUser):
+        """A user with a UUID as primary key"""
+        id = models.UUIDField(default=uuid.uuid4, primary_key=True)
+
+        class Meta:
+            app_label = 'auth'
diff --git a/tests/auth_tests/test_auth_backends.py b/tests/auth_tests/test_auth_backends.py
index 6cdcb96671..dad91e5ec2 100644
--- a/tests/auth_tests/test_auth_backends.py
+++ b/tests/auth_tests/test_auth_backends.py
@@ -3,7 +3,9 @@ from __future__ import unicode_literals
 from datetime import date
 
 from django.conf import settings
-from django.contrib.auth import BACKEND_SESSION_KEY, authenticate, get_user
+from django.contrib.auth import (
+    BACKEND_SESSION_KEY, SESSION_KEY, authenticate, get_user,
+)
 from django.contrib.auth.backends import ModelBackend
 from django.contrib.auth.hashers import MD5PasswordHasher
 from django.contrib.auth.models import AnonymousUser, Group, Permission, User
@@ -13,7 +15,7 @@ from django.core.exceptions import ImproperlyConfigured, PermissionDenied
 from django.http import HttpRequest
 from django.test import TestCase, modify_settings, override_settings
 
-from .models import CustomPermissionsUser
+from .models import CustomPermissionsUser, UUIDUser
 
 
 class CountingMD5PasswordHasher(MD5PasswordHasher):
@@ -287,6 +289,18 @@ class CustomUserModelBackendAuthenticateTest(TestCase):
         self.assertEqual(test_user, authenticated_user)
 
 
+@override_settings(AUTH_USER_MODEL='auth.UUIDUser')
+class UUIDUserTests(TestCase):
+
+    def test_login(self):
+        """
+        A custom user with a UUID primary key should be able to login.
+        """
+        user = UUIDUser.objects.create_user(username='uuid', password='test')
+        self.assertTrue(self.client.login(username='uuid', password='test'))
+        self.assertEqual(UUIDUser.objects.get(pk=self.client.session[SESSION_KEY]), user)
+
+
 class TestObj(object):
     pass