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-rw-r--r--tests/aggregation/tests.py14
1 files changed, 14 insertions, 0 deletions
diff --git a/tests/aggregation/tests.py b/tests/aggregation/tests.py
index dd30f57bed..f523b3ca35 100644
--- a/tests/aggregation/tests.py
+++ b/tests/aggregation/tests.py
@@ -1151,6 +1151,20 @@ class AggregateTestCase(TestCase):
)
self.assertTrue(publisher_qs.exists())
+ def test_aggregation_exists_annotation(self):
+ published_books = Book.objects.filter(publisher=OuterRef('pk'))
+ publisher_qs = Publisher.objects.annotate(
+ published_book=Exists(published_books),
+ count=Count('book'),
+ ).values_list('name', flat=True)
+ self.assertCountEqual(list(publisher_qs), [
+ 'Apress',
+ 'Morgan Kaufmann',
+ "Jonno's House of Books",
+ 'Prentice Hall',
+ 'Sams',
+ ])
+
@skipUnlessDBFeature('supports_subqueries_in_group_by')
def test_group_by_subquery_annotation(self):
"""