instance method record_update_timestamps

# File activerecord/lib/active_record/timestamp.rb, line 130
    def record_update_timestamps
      if @_touch_record && should_record_timestamps?
        current_time = current_time_from_proper_timezone

        timestamp_attributes_for_update_in_model.each do |column|
          next if will_save_change_to_attribute?(column)
          _write_attribute(column, current_time)
        end
      end

      yield if block_given?
    end