diff --git a/django/db/models/sql/where.py b/django/db/models/sql/where.py index ef856893b5..603ae3dfbe 100644 --- a/django/db/models/sql/where.py +++ b/django/db/models/sql/where.py @@ -204,6 +204,10 @@ class WhereNode(tree.Node): raise EmptyResultSet if extra: return ('%s IN %s' % (field_sql, extra), params) + if not params: + # Empty params would generate invalid sql in subquery + raise EmptyResultSet + max_in_list_size = connection.ops.max_in_list_size() if max_in_list_size and len(params) > max_in_list_size: # Break up the params list into an OR of manageable chunks. diff --git a/tests/regressiontests/queries/tests.py b/tests/regressiontests/queries/tests.py index 82a8de08be..c241c81fab 100644 --- a/tests/regressiontests/queries/tests.py +++ b/tests/regressiontests/queries/tests.py @@ -2021,6 +2021,9 @@ class WeirdQuerysetSlicingTests(BaseQuerysetTest): Article.objects.create(name='three', created=datetime.datetime.now()) Article.objects.create(name='four', created=datetime.datetime.now()) + food = Food.objects.create(name='spam') + Eaten.objects.create(meal='spam with eggs', food=food) + def test_tickets_7698_10202(self): # People like to slice with '0' as the high-water mark. self.assertQuerysetEqual(Article.objects.all()[0:0], []) @@ -2036,6 +2039,18 @@ class WeirdQuerysetSlicingTests(BaseQuerysetTest): # ticket #12192 self.assertNumQueries(0, lambda: list(Number.objects.all()[1:1])) + def test_empty_sliced_subquery(self): + # ticket #19263 - testing subqueries + self.assertEqual( + Eaten.objects.filter(food__in=Food.objects.all()[0:0]).count(), + 0) + + def test_empty_sliced_subquery_exclude(self): + # ticket #19263 - testing subqueries + self.assertEqual( + Eaten.objects.exclude(food__in=Food.objects.all()[0:0]).count(), + 1) + class EscapingTests(TestCase): def test_ticket_7302(self):