# File lib/couchrest/model/properties.rb, line 194
        def timestamps!
          property(:updated_at, Time, :read_only => true, :protected => true, :auto_validation => false)
          property(:created_at, Time, :read_only => true, :protected => true, :auto_validation => false)

          set_callback :save, :before do |object|
            write_attribute('updated_at', Time.now)
            write_attribute('created_at', Time.now) if object.new?
          end
        end