Fixed #32256 -- Fixed migration optimization crash when swapping field names.

This disables optimization of RenameField operation when an old field
name is referenced in subsequent operations.

Co-authored-by: InvalidInterrupt <InvalidInterrupt@users.noreply.github.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/migrations/test_optimizer.py b/tests/migrations/test_optimizer.py
index 9bb1aafebd..0caaf66f9e 100644
--- a/tests/migrations/test_optimizer.py
+++ b/tests/migrations/test_optimizer.py
@@ -572,6 +572,23 @@ class OptimizerTests(SimpleTestCase):
             ],
         )
 
+    def test_swapping_fields_names(self):
+        self.assertDoesNotOptimize(
+            [
+                migrations.CreateModel(
+                    'MyModel',
+                    [
+                        ('field_a', models.IntegerField()),
+                        ('field_b', models.IntegerField()),
+                    ],
+                ),
+                migrations.RunPython(migrations.RunPython.noop),
+                migrations.RenameField('MyModel', 'field_a', 'field_c'),
+                migrations.RenameField('MyModel', 'field_b', 'field_a'),
+                migrations.RenameField('MyModel', 'field_c', 'field_b'),
+            ],
+        )
+
     def test_create_model_remove_field(self):
         """
         RemoveField should optimize into CreateModel.