Fixed #36092 -- Disallowed non-local fields in composite primary keys.

1 files changed, 21 insertions, 0 deletions

diff --git a/tests/composite_pk/test_checks.py b/tests/composite_pk/test_checks.py
index c803d521cc..c33f2ee2eb 100644
--- a/tests/composite_pk/test_checks.py
+++ b/tests/composite_pk/test_checks.py
@@ -247,3 +247,24 @@ class CompositePKChecksTests(TestCase):
                 ),
             ],
         )
+
+    def test_composite_pk_cannot_include_non_local_field(self):
+        class Foo(models.Model):
+            a = models.SmallIntegerField()
+
+        class Bar(Foo):
+            pk = models.CompositePrimaryKey("a", "b")
+            b = models.SmallIntegerField()
+
+        self.assertEqual(Foo.check(databases=self.databases), [])
+        self.assertEqual(
+            Bar.check(databases=self.databases),
+            [
+                checks.Error(
+                    "'a' cannot be included in the composite primary key.",
+                    hint="'a' field is not a local field.",
+                    obj=Bar,
+                    id="models.E042",
+                ),
+            ],
+        )