routes_for

# File actionpack/lib/action_controller/routing/route_set.rb, line 405
      def routes_for(options, merged, expire_on)
        raise "Need controller and action!" unless controller && action
        controller = merged[:controller]
        merged = options if expire_on[:controller]
        action = merged[:action] || 'index'

        routes_by_controller[controller][action][merged.keys]
      end