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Fixed #12687 -- fixed an issue with aggregates and counts in conjunction with annotations where the QuerySet was provably empty.

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@14586 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Alex Gaynor 2010-11-17 02:57:14 +00:00
parent 3e9d2f81c5
commit 4276b5197b
4 changed files with 36 additions and 4 deletions
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18
tests/regressiontests/aggregation_regress/tests.py
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@ -622,6 +622,24 @@ class AggregationTests(TestCase):
lambda: Book.objects.annotate(mean_age=Avg('authors__age')).annotate(Avg('mean_age'))
)
def test_empty_filter_count(self):
self.assertEqual(
Author.objects.filter(id__in=[]).annotate(Count("friends")).count(),
0
)
def test_empty_filter_aggregate(self):
self.assertEqual(
Author.objects.filter(id__in=[]).annotate(Count("friends")).aggregate(Count("pk")),
{"pk__count": None}
)
def test_annotate_and_join(self):
self.assertEqual(
Author.objects.annotate(c=Count("friends__name")).exclude(friends__name="Joe").count(),
Author.objects.count()
)
@skipUnlessDBFeature('supports_stddev')
def test_stddev(self):
self.assertEqual(