Fixed #17594 -- Stopped ModelFormset.save from running a SELECT query by relying on the fact that the initial form is already set. Thanks, tswicegood.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17434 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/forms/models.py

@@ -591,7 +591,7 @@ class BaseModelFormSet(BaseFormSet):
     def save_existing_objects(self, commit=True):
         self.changed_objects = []
         self.deleted_objects = []
-        if not self.get_queryset():
+        if not self.initial_forms:
             return []
 
         saved_instances = []

tests/regressiontests/model_formsets_regress/tests.py

@@ -249,6 +249,17 @@ class FormsetTests(TestCase):
         self.assertEqual(formset.extra_forms[0].initial['username'], "apollo11")
         self.assertTrue(u'value="apollo12"' in formset.extra_forms[1].as_p())
 
+    def test_extraneous_query_is_not_run(self):
+        Formset = modelformset_factory(Network)
+        data = {u'test-TOTAL_FORMS': u'1',
+                u'test-INITIAL_FORMS': u'0',
+                u'test-MAX_NUM_FORMS': u'',
+                u'test-0-name': u'Random Place', }
+        with self.assertNumQueries(1):
+            formset = Formset(data, prefix="test")
+            formset.save()
+
+
 class CustomWidget(forms.CharField):
     pass