1 files changed, 8 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/serialization.rb b/activerecord/lib/active_record/attribute_methods/serialization.rb
index 47d4a938af..25d62fdb85 100644
--- a/activerecord/lib/active_record/attribute_methods/serialization.rb
+++ b/activerecord/lib/active_record/attribute_methods/serialization.rb
@@ -112,6 +112,14 @@ module ActiveRecord
           end
         end
 
+        def _field_changed?(attr, old, value)
+          if self.class.serialized_attributes.include?(attr)
+            old != value
+          else
+            super
+          end
+        end
+
         def read_attribute_before_type_cast(attr_name)
           if self.class.serialized_attributes.include?(attr_name)
             super.unserialized_value