Ticket #16759: 16759_test.diff

tests/regressiontests/queries/tests.py

@@ -7 +7 @@
 from django.conf import settings
 from django.core.exceptions import FieldError
 from django.db import DatabaseError, connection, connections, DEFAULT_DB_ALIAS
-from django.db.models import Count
+from django.db.models import Count, F
 from django.db.models.query import Q, ITER_CHUNK_SIZE, EmptyQuerySet
 from django.test import TestCase, skipUnlessDBFeature
 from django.utils import unittest
@@ -1610 +1610 @@
         except:
             self.fail('Query should be clonable')
 
+    def test_clone_restricted(self):
+        """
+        Test that cloning a queryset does not get out of hand. While complete
+        testing is impossible, this is a sanity check against invalid use of
+        deepcopy. refs #16759.
+        """
+        qs = Note.objects.all().filter(pk__lte=F('pk') + 1)
+        orig_opts = qs.query.where.children[0].children[0][3].opts
+        # Lets clone it and see that the opts did not get cloned.
+        qs = qs.all()
+        new_opts = qs.query.where.children[0].children[0][3].opts
+        self.assertTrue(orig_opts is new_opts)
 
 class EmptyQuerySetTests(TestCase):
     def test_emptyqueryset_values(self):