How can I set default parameter value in routing in rails 3

问题

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"

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

回答1:

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

More details in the official Rails guides.

来源：https://stackoverflow.com/questions/7240003/how-can-i-set-default-parameter-value-in-routing-in-rails-3