Refs #25367 -- Added test for Exists() lookup rhs.

charettes · felixxm · commit f7e9db14bbd3 · 2019-08-12T09:39:26.000+02:00
diff --git a/tests/lookup/tests.py b/tests/lookup/tests.py
@@ -5,6 +5,7 @@
 
 from django.core.exceptions import FieldError
 from django.db import connection
+from django.db.models.expressions import Exists, OuterRef
 from django.db.models.functions import Substr
 from django.test import TestCase, skipUnlessDBFeature
 
@@ -932,3 +933,12 @@ def test_custom_lookup_none_rhs(self):
         field = query.model._meta.get_field('nulled_text_field')
         self.assertIsInstance(query.build_lookup(['isnull_none_rhs'], field, None), IsNullWithNoneAsRHS)
         self.assertTrue(Season.objects.filter(pk=season.pk, nulled_text_field__isnull_none_rhs=True))
+
+    def test_exact_exists(self):
+        qs = Article.objects.filter(pk=OuterRef('pk'))
+        seasons = Season.objects.annotate(
+            pk_exists=Exists(qs),
+        ).filter(
+            pk_exists=Exists(qs),
+        )
+        self.assertCountEqual(seasons, Season.objects.all())
