From 4d8a0f8902dd55348fbaf897048bef1cba285f05 Mon Sep 17 00:00:00 2001
From: Jannis Leidel <jannis@leidel.info>
Date: Sat, 4 Feb 2012 16:05:39 +0000
Subject: [PATCH] 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                                |  2 +-
 tests/regressiontests/model_formsets_regress/tests.py | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/django/forms/models.py b/django/forms/models.py
index 15d50419d4..cd8f027070 100644
--- a/django/forms/models.py
+++ b/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 = []
diff --git a/tests/regressiontests/model_formsets_regress/tests.py b/tests/regressiontests/model_formsets_regress/tests.py
index 613d77616c..f1e935e2ea 100644
--- a/tests/regressiontests/model_formsets_regress/tests.py
+++ b/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