[4.1.x] Fixed #33932 -- Fixed altering AutoFields to OneToOneField on PostgreSQL.

Regression in 2eea361eff58dd98c409c5227064b901f41bd0d6.

Backport of e3cb8bcb7d2a2d392e726ee1f7e32a8d9038e14c from main

1 files changed, 26 insertions, 0 deletions

diff --git a/tests/schema/tests.py b/tests/schema/tests.py
index 94e9c8e0d7..bb8c923c1e 100644
--- a/tests/schema/tests.py
+++ b/tests/schema/tests.py
@@ -1500,6 +1500,32 @@ class SchemaTests(TransactionTestCase):
         # OneToOneField.
         self.assertEqual(counts, {"fks": expected_fks, "uniques": 1, "indexes": 0})
 
+    def test_autofield_to_o2o(self):
+        with connection.schema_editor() as editor:
+            editor.create_model(Author)
+            editor.create_model(Note)
+
+        # Rename the field.
+        old_field = Author._meta.get_field("id")
+        new_field = AutoField(primary_key=True)
+        new_field.set_attributes_from_name("note_ptr")
+        new_field.model = Author
+
+        with connection.schema_editor() as editor:
+            editor.alter_field(Author, old_field, new_field, strict=True)
+        # Alter AutoField to OneToOneField.
+        new_field_o2o = OneToOneField(Note, CASCADE)
+        new_field_o2o.set_attributes_from_name("note_ptr")
+        new_field_o2o.model = Author
+
+        with connection.schema_editor() as editor:
+            editor.alter_field(Author, new_field, new_field_o2o, strict=True)
+        columns = self.column_classes(Author)
+        field_type, _ = columns["note_ptr_id"]
+        self.assertEqual(
+            field_type, connection.features.introspected_field_types["IntegerField"]
+        )
+
     def test_alter_field_fk_keeps_index(self):
         with connection.schema_editor() as editor:
             editor.create_model(Author)