如何在Rails 3的布线中设置默认参数值

问题描述：

如何在Rails 3的路由中设置默认参数值。
例如，我有此路由

How can I set default parameter value in routing in Rails 3. For example I have this route

match ':slug/:id/:direction' => 'quiz#show', :as => :quiz_details, :direction => "next"

，而我想将direction的值默认为 next 。

and I want to default the value of direction to next.

答

match ':slug/:id/:direction' => 'quiz#show', :as => :quiz_details, :defaults => { :direction => "next" }

更多详细信息，请参见 Rails官方指南。

More details in the official Rails guides.