Refs #27118 -- Reallowed using pk in QuerySet.get/update_or_create().

django/db/models/query.py

@@ -532,7 +532,8 @@ def _extract_model_params(self, defaults, **kwargs):
             try:
                 self.model._meta.get_field(param)
             except exceptions.FieldDoesNotExist:
-                invalid_params.append(param)
+                if param != 'pk':  # It's okay to use a model's pk property.
+                    invalid_params.append(param)
         if invalid_params:
             raise exceptions.FieldError(
                 "Invalid field name(s) for model %s: '%s'." % (

tests/get_or_create/tests.py

@@ -71,6 +71,12 @@ def test_get_or_create_invalid_params(self):
         with self.assertRaises(IntegrityError):
             Person.objects.get_or_create(first_name="Tom", last_name="Smith")
 
+    def test_get_or_create_with_pk_property(self):
+        """
+        Using the pk property of a model is allowed.
+        """
+        Thing.objects.get_or_create(pk=1)
+
     def test_get_or_create_on_related_manager(self):
         p = Publisher.objects.create(name="Acme Publishing")
         # Create a book through the publisher.
@@ -324,6 +330,12 @@ def test_manual_primary_key_test(self):
             ManualPrimaryKeyTest.objects.update_or_create(id=1, data="Different")
         self.assertEqual(ManualPrimaryKeyTest.objects.get(id=1).data, "Original")
 
+    def test_with_pk_property(self):
+        """
+        Using the pk property of a model is allowed.
+        """
+        Thing.objects.update_or_create(pk=1)
+
     def test_error_contains_full_traceback(self):
         """
         update_or_create should raise IntegrityErrors with the full traceback.