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[1.6.x] Fixed #21167 - Improved queries.tests.SubqueryTests 

Improve tests to cover slicing scenarios that could be handled in unique
ways by 3rd party database backends.

Backport of b0e06c3662 from master
This commit is contained in:
Michael Manfre 2013-09-25 17:14:33 -04:00 committed by Anssi Kääriäinen
parent 5303afcd97
commit 5d72ce061f
1 changed files with 37 additions and 8 deletions
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45
tests/queries/tests.py
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@ -1877,34 +1877,63 @@ class SubqueryTests(TestCase):
DumbCategory.objects.create(id=1)
DumbCategory.objects.create(id=2)
DumbCategory.objects.create(id=3)
DumbCategory.objects.create(id=4)
def test_ordered_subselect(self):
"Subselects honor any manual ordering"
try:
query = DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[0:2])
self.assertEqual(set(query.values_list('id', flat=True)), set([2,3]))
self.assertEqual(set(query.values_list('id', flat=True)), set([3,4]))
query = DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[:2])
self.assertEqual(set(query.values_list('id', flat=True)), set([2,3]))
self.assertEqual(set(query.values_list('id', flat=True)), set([3,4]))
query = DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[1:2])
self.assertEqual(set(query.values_list('id', flat=True)), set([3]))
query = DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[2:])
self.assertEqual(set(query.values_list('id', flat=True)), set([1]))
except DatabaseError:
self.assertEqual(set(query.values_list('id', flat=True)), set([1,2]))
except DatabaseError as e:
# Oracle and MySQL both have problems with sliced subselects.
# This prevents us from even evaluating this test case at all.
# Refs #10099
self.assertFalse(connections[DEFAULT_DB_ALIAS].features.allow_sliced_subqueries)
self.assertFalse(connections[DEFAULT_DB_ALIAS].features.allow_sliced_subqueries, str(e))
def test_slice_subquery_and_query(self):
"""
Slice a query that has a sliced subquery
"""
try:
query = DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[0:2])[0:2]
self.assertEqual(set([x.id for x in query]), set([3,4]))
query = DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[1:3])[1:3]
self.assertEqual(set([x.id for x in query]), set([3]))
query = DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[2:])[1:]
self.assertEqual(set([x.id for x in query]), set([2]))
except DatabaseError as e:
# Oracle and MySQL both have problems with sliced subselects.
# This prevents us from even evaluating this test case at all.
# Refs #10099
self.assertFalse(connections[DEFAULT_DB_ALIAS].features.allow_sliced_subqueries, str(e))
def test_sliced_delete(self):
"Delete queries can safely contain sliced subqueries"
try:
DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[0:1]).delete()
self.assertEqual(set(DumbCategory.objects.values_list('id', flat=True)), set([1,2]))
except DatabaseError:
self.assertEqual(set(DumbCategory.objects.values_list('id', flat=True)), set([1,2,3]))
DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[1:2]).delete()
self.assertEqual(set(DumbCategory.objects.values_list('id', flat=True)), set([1,3]))
DumbCategory.objects.filter(id__in=DumbCategory.objects.order_by('-id')[1:]).delete()
self.assertEqual(set(DumbCategory.objects.values_list('id', flat=True)), set([3]))
except DatabaseError as e:
# Oracle and MySQL both have problems with sliced subselects.
# This prevents us from even evaluating this test case at all.
# Refs #10099
self.assertFalse(connections[DEFAULT_DB_ALIAS].features.allow_sliced_subqueries)
self.assertFalse(connections[DEFAULT_DB_ALIAS].features.allow_sliced_subqueries, str(e))
class CloneTests(TestCase):