Get rid of some noise in the test that is clouding my thinking.

tests/test_query_counts.py

@@ -44,6 +44,21 @@ def test_resetting(self):
             tuple(A.polymorphs.select_related('fk').models(*models, include_self=False).models(None))
 
 
+class SanityChecksTestCase(TestCase):
+    def test_cc_prefetch_related(self):
+        """
+        proving to myself how prefetching from the grandchild works.
+        """
+        with self.assertNumQueries(9):
+            fk3 = FK3.objects.create()
+            fk8 = FK8.objects.create()
+            fk5 = FK5.objects.create()
+            out = CC._default_manager.create(fk3=fk3, fk5=fk5, fk8=fk8, fk=None)
+        # 1 CC query + 1 each for fk3,fk5,fk8
+        with self.assertNumQueries(4):
+            list(CC.objects.prefetch_related('fk3', 'fk5', 'fk8').filter(pk=out))
+
+
 class RelationQueryCounts(TestCase):
     def test_not_doing_any_prefetching_related_via_children(self):
         with self.assertNumQueries(39):
@@ -212,56 +227,56 @@ def test_prefetch_related(self):
             pk_cb = CB._default_manager.create(fk4=fk4, fk2=fk2, fk7=fk7).pk
             pk_cc = CC._default_manager.create(fk3=fk3, fk5=fk5, fk8=fk8).pk
 
-
-        with self.assertNumQueries(2):
-            a = A.polymorphs.get(pk=pk_a)
-            assert a.fk == fk
-
-        with self.assertNumQueries(1):
-            prefetches = ('aa__fk2', 'aa__fk')
-            aa = A.polymorphs.select_subclasses(AA).prefetch_related(*prefetches).get(pk=pk_aa)
-            assert aa.fk2 == fk2
-            assert aa.fk is None
-
-        with self.assertNumQueries(1):
-            prefetches = ('ab__fk3', 'ab__fk')
-            ab = A.polymorphs.select_subclasses(AB).prefetch_related(*prefetches).get(pk=pk_ab)
-            assert ab.fk3 == fk3
-            assert ab.fk == fk
-
-        with self.assertNumQueries(1):
-            prefetches = ('aa__ba__fk4', 'aa__ba__fk2', 'aa__ba__fk')
-            ba = A.polymorphs.select_subclasses(BA).prefetch_related(*prefetches).get(pk=pk_ba)
-            assert ba.fk4 == fk4
-            assert ba.fk2 == fk2
-            assert ba.fk is None
-
-        with self.assertNumQueries(1):
-            prefetches = ('ab__bb__fk5', 'ab__bb__fk3', 'ab__bb__fk')
-            bb = A.polymorphs.select_subclasses(BB).prefetch_related(*prefetches).get(pk=pk_bb)
-            assert bb.fk5 == fk5
-            assert bb.fk3 == fk3
-            assert bb.fk is None
-
-        with self.assertNumQueries(1):
-            prefetches = (
-            'aa__ba__ca__fk6', 'aa__ba__ca__fk2', 'aa__ba__ca__fk4',
-            'aa__ba__ca__fk')
-            ca = A.polymorphs.select_subclasses(CA).prefetch_related(*prefetches).get(pk=pk_ca)
-            assert ca.fk6 == fk6
-            assert ca.fk2 == fk2
-            assert ca.fk4 == fk4
-            assert ca.fk is None
-
-        with self.assertNumQueries(1):
-            prefetches = (
-            'aa__ba__cb__fk7', 'aa__ba__cb__fk2', 'aa__ba__cb__fk4',
-            'aa__ba__cb__fk')
-            cb = A.polymorphs.select_subclasses(CB).prefetch_related(*prefetches).get(pk=pk_cb)
-            assert cb.fk7 == fk7
-            assert cb.fk2 == fk2
-            assert cb.fk4 == fk4
-            assert cb.fk is None
+        #
+        # with self.assertNumQueries(2):
+        #     a = A.polymorphs.get(pk=pk_a)
+        #     assert a.fk == fk
+        #
+        # with self.assertNumQueries(1):
+        #     prefetches = ('aa__fk2', 'aa__fk')
+        #     aa = A.polymorphs.select_subclasses(AA).prefetch_related(*prefetches).get(pk=pk_aa)
+        #     assert aa.fk2 == fk2
+        #     assert aa.fk is None
+        #
+        # with self.assertNumQueries(1):
+        #     prefetches = ('ab__fk3', 'ab__fk')
+        #     ab = A.polymorphs.select_subclasses(AB).prefetch_related(*prefetches).get(pk=pk_ab)
+        #     assert ab.fk3 == fk3
+        #     assert ab.fk == fk
+        #
+        # with self.assertNumQueries(1):
+        #     prefetches = ('aa__ba__fk4', 'aa__ba__fk2', 'aa__ba__fk')
+        #     ba = A.polymorphs.select_subclasses(BA).prefetch_related(*prefetches).get(pk=pk_ba)
+        #     assert ba.fk4 == fk4
+        #     assert ba.fk2 == fk2
+        #     assert ba.fk is None
+        #
+        # with self.assertNumQueries(1):
+        #     prefetches = ('ab__bb__fk5', 'ab__bb__fk3', 'ab__bb__fk')
+        #     bb = A.polymorphs.select_subclasses(BB).prefetch_related(*prefetches).get(pk=pk_bb)
+        #     assert bb.fk5 == fk5
+        #     assert bb.fk3 == fk3
+        #     assert bb.fk is None
+        #
+        # with self.assertNumQueries(1):
+        #     prefetches = (
+        #     'aa__ba__ca__fk6', 'aa__ba__ca__fk2', 'aa__ba__ca__fk4',
+        #     'aa__ba__ca__fk')
+        #     ca = A.polymorphs.select_subclasses(CA).prefetch_related(*prefetches).get(pk=pk_ca)
+        #     assert ca.fk6 == fk6
+        #     assert ca.fk2 == fk2
+        #     assert ca.fk4 == fk4
+        #     assert ca.fk is None
+        #
+        # with self.assertNumQueries(1):
+        #     prefetches = (
+        #     'aa__ba__cb__fk7', 'aa__ba__cb__fk2', 'aa__ba__cb__fk4',
+        #     'aa__ba__cb__fk')
+        #     cb = A.polymorphs.select_subclasses(CB).prefetch_related(*prefetches).get(pk=pk_cb)
+        #     assert cb.fk7 == fk7
+        #     assert cb.fk2 == fk2
+        #     assert cb.fk4 == fk4
+        #     assert cb.fk is None
 
         with self.assertNumQueries(1):
             prefetches = (