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Fixed #23758 -- Allowed more than 5 levels of subqueries

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Refactored bump_prefix() to avoid infinite loop and allow more than
than 5 subquires by extending the alphabet to use multi-letters.
This commit is contained in:
Piotr Pawlaczek
2014-11-15 14:45:00 +01:00
committed by Tim Graham
parent 478d6a9503
commit 41fc1c0b5e
3 changed files with 52 additions and 4 deletions
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19
tests/queries/tests.py
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@@ -383,6 +383,25 @@ class Queries1Tests(BaseQuerysetTest):
['<Item: four>']
)
def test_avoid_infinite_loop_on_too_many_subqueries(self):
x = Tag.objects.filter(pk=1)
local_recursion_limit = 127
msg = 'Maximum recursion depth exceeded: too many subqueries.'
with self.assertRaisesMessage(RuntimeError, msg):
for i in six.moves.range(local_recursion_limit * 2):
x = Tag.objects.filter(pk__in=x)
def test_reasonable_number_of_subq_aliases(self):
x = Tag.objects.filter(pk=1)
for _ in xrange(20):
x = Tag.objects.filter(pk__in=x)
self.assertEqual(
x.query.subq_aliases, {
'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'AA', 'AB', 'AC', 'AD',
'AE', 'AF', 'AG', 'AH', 'AI', 'AJ', 'AK', 'AL', 'AM', 'AN',
}
)
def test_heterogeneous_qs_combination(self):
# Combining querysets built on different models should behave in a well-defined
# fashion. We raise an error.