Fixed #29782 -- Added better error message when filtering queryset with AnonymousUser.

AUTHORS

@@ -694,6 +694,7 @@ answer newbie questions, and generally made Django that much better:
     Ramez Ashraf <ramezashraf@gmail.com>
     Ramin Farajpour Cami <ramin.blackhat@gmail.com>
     Ramiro Morales <ramiro@rmorales.net>
+    Ramon Saraiva <ramonsaraiva@gmail.com>
     Ram Rachum <ram@rachum.com>
     Randy Barlow <randy@electronsweatshop.com>
     Raphaël Barrois <raphael.barrois@m4x.org>

django/contrib/auth/models.py

@@ -383,6 +383,9 @@ class AnonymousUser:
     def __hash__(self):
         return 1  # instances always return the same hash value
 
+    def __int__(self):
+        raise TypeError('Cannot cast AnonymousUser to int. Are you trying to use it in place of User?')
+
     def save(self):
         raise NotImplementedError("Django doesn't provide a DB representation for AnonymousUser.")
 

tests/auth_tests/test_models.py

@@ -345,6 +345,14 @@ class AnonymousUserTests(SimpleTestCase):
     def test_hash(self):
         self.assertEqual(hash(self.user), 1)
 
+    def test_int(self):
+        msg = (
+            'Cannot cast AnonymousUser to int. Are you trying to use it in '
+            'place of User?'
+        )
+        with self.assertRaisesMessage(TypeError, msg):
+            int(self.user)
+
     def test_delete(self):
         with self.assertRaisesMessage(NotImplementedError, self.no_repr_msg):
             self.user.delete()