Refs #30966 -- Added test for reloading related model state on non-relational changes.

Thanks Markus Holtermann for initial test.

Fixed in 1d16c5d562a67625f7309cc7765b8c57d49bf182.

1 files changed, 31 insertions, 0 deletions

diff --git a/tests/migrations/test_state.py b/tests/migrations/test_state.py
index 44d4cdf268..1bb6b66c3c 100644
--- a/tests/migrations/test_state.py
+++ b/tests/migrations/test_state.py
@@ -532,6 +532,37 @@ class StateTests(SimpleTestCase):
         project_state.add_model(ModelState.from_model(B))
         self.assertEqual(len(project_state.apps.get_models()), 2)
 
+    def test_reload_related_model_on_non_relational_fields(self):
+        """
+        The model is reloaded even on changes that are not involved in
+        relations. Other models pointing to or from it are also reloaded.
+        """
+        project_state = ProjectState()
+        project_state.apps  # Render project state.
+        project_state.add_model(ModelState('migrations', 'A', []))
+        project_state.add_model(ModelState('migrations', 'B', [
+            ('a', models.ForeignKey('A', models.CASCADE)),
+        ]))
+        project_state.add_model(ModelState('migrations', 'C', [
+            ('b', models.ForeignKey('B', models.CASCADE)),
+            ('name', models.TextField()),
+        ]))
+        project_state.add_model(ModelState('migrations', 'D', [
+            ('a', models.ForeignKey('A', models.CASCADE)),
+        ]))
+        operation = AlterField(
+            model_name='C',
+            name='name',
+            field=models.TextField(blank=True),
+        )
+        operation.state_forwards('migrations', project_state)
+        project_state.reload_model('migrations', 'a', delay=True)
+        A = project_state.apps.get_model('migrations.A')
+        B = project_state.apps.get_model('migrations.B')
+        D = project_state.apps.get_model('migrations.D')
+        self.assertIs(B._meta.get_field('a').related_model, A)
+        self.assertIs(D._meta.get_field('a').related_model, A)
+
     def test_reload_model_relationship_consistency(self):
         project_state = ProjectState()
         project_state.add_model(ModelState('migrations', 'A', []))