Fixed #28298 -- Prevented a primary key alteration from adding a foreign key constraint if db_constraint=False.

1 files changed, 1 insertions, 1 deletions

diff --git a/django/db/backends/base/schema.py b/django/db/backends/base/schema.py
index 91ee3dac22..c24e809570 100644
--- a/django/db/backends/base/schema.py
+++ b/django/db/backends/base/schema.py
@@ -727,7 +727,7 @@ class BaseDatabaseSchemaEditor:
         # Rebuild FKs that pointed to us if we previously had to drop them
         if old_field.primary_key and new_field.primary_key and old_type != new_type:
             for rel in new_field.model._meta.related_objects:
-                if not rel.many_to_many:
+                if not rel.many_to_many and rel.field.db_constraint:
                     self.execute(self._create_fk_sql(rel.related_model, rel.field, "_fk"))
         # Does it have check constraints we need to add?
         if old_db_params['check'] != new_db_params['check'] and new_db_params['check']: