Fixed #24747 -- Allowed transforms in QuerySet.order_by() and distinct(*fields).

tests/expressions/tests.py

@@ -1363,6 +1363,40 @@ class ValueTests(TestCase):
             ExpressionList()
 
 
+class FieldTransformTests(TestCase):
+
+    @classmethod
+    def setUpTestData(cls):
+        cls.sday = sday = datetime.date(2010, 6, 25)
+        cls.stime = stime = datetime.datetime(2010, 6, 25, 12, 15, 30, 747000)
+        cls.ex1 = Experiment.objects.create(
+            name='Experiment 1',
+            assigned=sday,
+            completed=sday + datetime.timedelta(2),
+            estimated_time=datetime.timedelta(2),
+            start=stime,
+            end=stime + datetime.timedelta(2),
+        )
+
+    def test_month_aggregation(self):
+        self.assertEqual(
+            Experiment.objects.aggregate(month_count=Count('assigned__month')),
+            {'month_count': 1}
+        )
+
+    def test_transform_in_values(self):
+        self.assertQuerysetEqual(
+            Experiment.objects.values('assigned__month'),
+            ["{'assigned__month': 6}"]
+        )
+
+    def test_multiple_transforms_in_values(self):
+        self.assertQuerysetEqual(
+            Experiment.objects.values('end__date__month'),
+            ["{'end__date__month': 6}"]
+        )
+
+
 class ReprTests(TestCase):
 
     def test_expressions(self):