[1.7.x] Added a unit test to ensure models cannot be ordered by a M2M field.

Backport of 865bc71783 from master

1 files changed, 21 insertions, 0 deletions

diff --git a/tests/invalid_models_tests/test_models.py b/tests/invalid_models_tests/test_models.py
index cf5abb2f6c..19dca14b37 100644
--- a/tests/invalid_models_tests/test_models.py
+++ b/tests/invalid_models_tests/test_models.py
@@ -375,6 +375,27 @@ class OtherModelTests(IsolatedModelsTestCase):
         ]
         self.assertEqual(errors, expected)
 
+    def test_non_valid(self):
+        class RelationModel(models.Model):
+            pass
+
+        class Model(models.Model):
+            relation = models.ManyToManyField(RelationModel)
+
+            class Meta:
+                ordering = ['relation']
+
+        errors = Model.check()
+        expected = [
+            Error(
+                "'ordering' refers to the non-existent field 'relation'.",
+                hint=None,
+                obj=Model,
+                id='models.E015',
+            ),
+        ]
+        self.assertEqual(errors, expected)
+
     def test_ordering_pointing_to_missing_field(self):
         class Model(models.Model):
             class Meta: