# File lib/aws/record/abstract_base.rb, line 282
        def touch_timestamps *attributes
          now = Time.now
          attributes.each do |attr_name|
            if
              self.class.attributes[attr_name] and
              !attribute_changed?(attr_name)
              # don't touch timestamps the user modified
            then
              __send__("#{attr_name}=", now)
            end
          end
        end