Fixed #24744 - Fixed relabeled_clone for the Transform

3 files changed, 23 insertions, 1 deletions

diff --git a/django/db/models/lookups.py b/django/db/models/lookups.py
index 45974093b4..9bcf8d6303 100644
--- a/django/db/models/lookups.py
+++ b/django/db/models/lookups.py
@@ -70,8 +70,13 @@ class Transform(RegisterLookupMixin):
     def output_field(self):
         return self.lhs.output_field
 
+    def copy(self):
+        return copy(self)
+
     def relabeled_clone(self, relabels):
-        return self.__class__(self.lhs.relabeled_clone(relabels))
+        copy = self.copy()
+        copy.lhs = self.lhs.relabeled_clone(relabels)
+        return copy
 
     def get_group_by_cols(self):
         return self.lhs.get_group_by_cols()
diff --git a/docs/releases/1.8.3.txt b/docs/releases/1.8.3.txt
index 6ac0d3f592..dc5edbcb9e 100644
--- a/docs/releases/1.8.3.txt
+++ b/docs/releases/1.8.3.txt
@@ -57,3 +57,5 @@ Bugfixes
 * Corrected join promotion for multiple ``Case`` expressions. Annotating a
   query with multiple  ``Case`` expressions could unexpectedly filter out
   results (:ticket:`24924`).
+
+* Fixed usage of transforms in subqueries (:ticket:`24744`).
diff --git a/tests/custom_lookups/tests.py b/tests/custom_lookups/tests.py
index 1b069047e4..dd8d431d3d 100644
--- a/tests/custom_lookups/tests.py
+++ b/tests/custom_lookups/tests.py
@@ -559,3 +559,18 @@ class CustomisedMethodsTests(TestCase):
     def test_overridden_get_transform_chain(self):
         q = CustomModel.objects.filter(field__transformfunc_banana__transformfunc_pear=3)
         self.assertIn('pear()', str(q.query))
+
+
+class SubqueryTransformTests(TestCase):
+    def test_subquery_usage(self):
+        models.IntegerField.register_lookup(Div3Transform)
+        try:
+            Author.objects.create(name='a1', age=1)
+            a2 = Author.objects.create(name='a2', age=2)
+            Author.objects.create(name='a3', age=3)
+            Author.objects.create(name='a4', age=4)
+            self.assertQuerysetEqual(
+                Author.objects.order_by('name').filter(id__in=Author.objects.filter(age__div3=2)),
+                [a2], lambda x: x)
+        finally:
+            models.IntegerField._unregister_lookup(Div3Transform)