routes,conditions,requirement

  map.with_options :conditions => { :subdomain => MIRRORS_REGEX} do |goyou_map|
    goyou_map.target 'target/:type/:type_id/:sort',
      :controller   => 'target', :action => 'index',
      :defaults     => { :sort => 'target_id'
    },
    :requirements => { :type => /(category)|(concept)/,
      :sort => /(target_id)|(change_rate)|(volume)/
    }
  end
 
  conditions <= 必須符合這個條件才會apply, 不符合就繼續往下找
  requirement   <= 會符合這個 rule, 但是 paramter 需符合 requirement