Fixed #29358 -- Added a system check to prohibit models with more than one primary_key field.

1 files changed, 13 insertions, 0 deletions

diff --git a/tests/invalid_models_tests/test_models.py b/tests/invalid_models_tests/test_models.py
index cfd1a7c465..2066d4ebae 100644
--- a/tests/invalid_models_tests/test_models.py
+++ b/tests/invalid_models_tests/test_models.py
@@ -717,6 +717,19 @@ class OtherModelTests(SimpleTestCase):
             )
         ])
 
+    def test_single_primary_key(self):
+        class Model(models.Model):
+            foo = models.IntegerField(primary_key=True)
+            bar = models.IntegerField(primary_key=True)
+
+        self.assertEqual(Model.check(), [
+            Error(
+                "Model can not contain more than one 'primary_key' field.",
+                obj=Model,
+                id='models.E026',
+            )
+        ])
+
     @override_settings(TEST_SWAPPED_MODEL_BAD_VALUE='not-a-model')
     def test_swappable_missing_app_name(self):
         class Model(models.Model):