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Fixed #32116 -- Fixed QuerySet.order_by() crash on EmptyQuerySet with union() on a single non-empty ordered queryset.

This commit is contained in:
Hannes Ljungberg 2020-10-17 21:54:36 +02:00 committed by Mariusz Felisiak
parent 4e4db426c5
commit c7c7615d00
2 changed files with 10 additions and 1 deletions
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6
django/db/models/query.py
View File

@ -995,7 +995,11 @@ class QuerySet:
# If the query is an EmptyQuerySet, combine all nonempty querysets.
if isinstance(self, EmptyQuerySet):
qs = [q for q in other_qs if not isinstance(q, EmptyQuerySet)]
return qs[0]._combinator_query('union', *qs[1:], all=all) if qs else self
if not qs:
return self
if len(qs) == 1:
return qs[0]
return qs[0]._combinator_query('union', *qs[1:], all=all)
return self._combinator_query('union', *other_qs, all=all)
def intersection(self, *other_qs):

5
tests/queries/test_qs_combinators.py
View File

@ -106,6 +106,11 @@ class QuerySetSetOperationTests(TestCase):
self.assertEqual(len(qs2.union(qs2)), 0)
self.assertEqual(len(qs3.union(qs3)), 0)
def test_empty_qs_union_with_ordered_qs(self):
qs1 = Number.objects.all().order_by('num')
qs2 = Number.objects.none().union(qs1).order_by('num')
self.assertEqual(list(qs1), list(qs2))
def test_limits(self):
qs1 = Number.objects.all()
qs2 = Number.objects.all()