Fixed #32676 -- Prevented migrations from rendering related field attributes when not passed during initialization.

Thanks Simon Charette for the implementation idea.

1 files changed, 28 insertions, 0 deletions

diff --git a/tests/field_deconstruction/tests.py b/tests/field_deconstruction/tests.py
index b746e46458..846f6d3ed7 100644
--- a/tests/field_deconstruction/tests.py
+++ b/tests/field_deconstruction/tests.py
@@ -432,6 +432,34 @@ class FieldDeconstructionTests(SimpleTestCase):
         self.assertEqual(kwargs, {"to": "auth.Permission"})
         self.assertEqual(kwargs['to'].setting_name, "AUTH_USER_MODEL")
 
+    def test_many_to_many_field_related_name(self):
+        class MyModel(models.Model):
+            flag = models.BooleanField(default=True)
+            m2m = models.ManyToManyField('self')
+            m2m_related_name = models.ManyToManyField(
+                'self',
+                related_name='custom_name',
+                related_query_name='custom_query_name',
+                limit_choices_to={'flag': True},
+            )
+
+        name, path, args, kwargs = MyModel.m2m.field.deconstruct()
+        self.assertEqual(path, 'django.db.models.ManyToManyField')
+        self.assertEqual(args, [])
+        # deconstruct() should not include attributes which were not passed to
+        # the field during initialization.
+        self.assertEqual(kwargs, {'to': 'field_deconstruction.MyModel'})
+        # Passed attributes.
+        name, path, args, kwargs = MyModel.m2m_related_name.field.deconstruct()
+        self.assertEqual(path, 'django.db.models.ManyToManyField')
+        self.assertEqual(args, [])
+        self.assertEqual(kwargs, {
+            'to': 'field_deconstruction.MyModel',
+            'related_name': 'custom_name',
+            'related_query_name': 'custom_query_name',
+            'limit_choices_to': {'flag': True},
+        })
+
     def test_positive_integer_field(self):
         field = models.PositiveIntegerField()
         name, path, args, kwargs = field.deconstruct()