instance method _touch_row

# File activerecord/lib/active_record/attribute_methods/dirty.rb, line 190
        def _touch_row(attribute_names, time)
          @_touch_attr_names = Set.new(attribute_names)

          affected_rows = super

          if @_skip_dirty_tracking ||= false
            clear_attribute_changes(@_touch_attr_names)
            return affected_rows
          end

          changes = {}
          @attributes.keys.each do |attr_name|
            next if @_touch_attr_names.include?(attr_name)

            if attribute_changed?(attr_name)
              changes[attr_name] = _read_attribute(attr_name)
              _write_attribute(attr_name, attribute_was(attr_name))
              clear_attribute_change(attr_name)
            end
          end

          changes_applied
          changes.each { |attr_name, value| _write_attribute(attr_name, value) }

          affected_rows
        ensure
          @_touch_attr_names, @_skip_dirty_tracking = nil, nil
        end