add_touch_callbacks

# File activerecord/lib/active_record/associations.rb, line 1384
        def add_touch_callbacks(reflection, touch_attribute)
          method_name = "belongs_to_touch_after_save_or_destroy_for_#{reflection.name}".to_sym
          define_method(method_name) do
            association = send(reflection.name)
            
            if touch_attribute == true
              association.touch unless association.nil?
            else
              association.touch(touch_attribute) unless association.nil?
            end
          end
          after_save(method_name)
          after_destroy(method_name)
        end