Fixed #25534, Fixed #31639 -- Added support for transform references in expressions.

Thanks Mariusz Felisiak and Simon Charette for reviews.

tests/update/tests.py

@@ -2,9 +2,10 @@ import unittest
 
 from django.core.exceptions import FieldError
 from django.db import IntegrityError, connection, transaction
-from django.db.models import Count, F, Max
-from django.db.models.functions import Concat, Lower
+from django.db.models import CharField, Count, F, IntegerField, Max
+from django.db.models.functions import Abs, Concat, Lower
 from django.test import TestCase
+from django.test.utils import register_lookup
 
 from .models import A, B, Bar, D, DataPoint, Foo, RelatedPoint, UniqueNumber
 
@@ -154,6 +155,13 @@ class AdvancedTests(TestCase):
         with self.assertRaisesMessage(FieldError, msg):
             Bar.objects.update(m2m_foo='whatever')
 
+    def test_update_transformed_field(self):
+        A.objects.create(x=5)
+        A.objects.create(x=-6)
+        with register_lookup(IntegerField, Abs):
+            A.objects.update(x=F('x__abs'))
+            self.assertCountEqual(A.objects.values_list('x', flat=True), [5, 6])
+
     def test_update_annotated_queryset(self):
         """
         Update of a queryset that's been annotated.
@@ -194,14 +202,18 @@ class AdvancedTests(TestCase):
 
     def test_update_with_joined_field_annotation(self):
         msg = 'Joined field references are not permitted in this query'
-        for annotation in (
-            F('data__name'),
-            Lower('data__name'),
-            Concat('data__name', 'data__value'),
-        ):
-            with self.subTest(annotation=annotation):
-                with self.assertRaisesMessage(FieldError, msg):
-                    RelatedPoint.objects.annotate(new_name=annotation).update(name=F('new_name'))
+        with register_lookup(CharField, Lower):
+            for annotation in (
+                F('data__name'),
+                F('data__name__lower'),
+                Lower('data__name'),
+                Concat('data__name', 'data__value'),
+            ):
+                with self.subTest(annotation=annotation):
+                    with self.assertRaisesMessage(FieldError, msg):
+                        RelatedPoint.objects.annotate(
+                            new_name=annotation,
+                        ).update(name=F('new_name'))
 
 
 @unittest.skipUnless(