1 files changed, 3 insertions, 4 deletions
diff --git a/activemodel/lib/active_model/attribute_mutation_tracker.rb b/activemodel/lib/active_model/attribute_mutation_tracker.rb
index 8e92c8807f..493be5bb88 100644
--- a/activemodel/lib/active_model/attribute_mutation_tracker.rb
+++ b/activemodel/lib/active_model/attribute_mutation_tracker.rb
@@ -35,10 +35,6 @@ module ActiveModel
       end
     end
 
-    def changed_attribute_names
-      attr_names.select { |attr| changed?(attr) }
-    end
-
     def any_changes?
       attr_names.any? { |attr| changed?(attr) }
     end
@@ -108,5 +104,8 @@ module ActiveModel
 
     def original_value(*)
     end
+
+    def force_change(*)
+    end
   end
 end