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Fixed #12192 -- Don't execute any DB query when the QS slicing being performed

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will result in use of LIMIT 0. Thanks Suor for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14204 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Ramiro Morales 2010-10-13 23:36:16 +00:00
parent 5f5a61e780
commit 08d14925c9
3 changed files with 16 additions and 1 deletions
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12
tests/regressiontests/queries/tests.py
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@ -86,8 +86,18 @@ class EmptyQuerySetTests(TestCase):
def test_emptyqueryset_values(self):
"#14366 -- calling .values() on an EmptyQuerySet and then cloning that should not cause an error"
self.assertEqual(list(Number.objects.none().values('num').order_by('num')), [])
def test_values_subquery(self):
self.assertQuerysetEqual(
Number.objects.filter(pk__in=Number.objects.none().values("pk")), []
)
class WeirdQuerySetSlicing(TestCase):
def setUp(self):
Number.objects.create(num=1)
Number.objects.create(num=2)
def test_empty_resultset_sql(self):
# ticket #12192
self.assertNumQueries(0, lambda: list(Number.objects.all()[1:1]))