Ruby on rails 轨道中的路线链接？

我正在用Rails编写一个会议列表网站，遇到了以下要求：

链，无特定顺序，用于查找事件的URL，例如：

/in/：city/on/：tag/with/：speaker

或者像这样重新排列

/在/：城市/带/：扬声器/打开/：标签

---

我可以一个接一个地处理这些问题。有没有一种方法可以动态处理这些请求？

我是通过以下方法实现的（请原谅其中的一些特定于应用程序的代码）：

routes.rb：

  map.connect '/:type/*facets', :controller => 'events', :action => 'facets'

事件\u controller.rb：

def facets
    @events = find_by_facets(params[:facets], params[:type])
    render :action => "index"

  end

def find_by_facets(facets, type = nil)
query = type.nil? ? "Event" : "Event.is('#{type.singularize.capitalize}')"
for i in (0..(facets.length - 1)).step(2)
  query += ".#{facets[i]}('#{facets[i+1].to_word.capitalize_words}')"
end
@events = eval(query)

end

应用程序_controller.rb：

def facets
    @events = find_by_facets(params[:facets], params[:type])
    render :action => "index"

  end

def find_by_facets(facets, type = nil)
query = type.nil? ? "Event" : "Event.is('#{type.singularize.capitalize}')"
for i in (0..(facets.length - 1)).step(2)
  query += ".#{facets[i]}('#{facets[i+1].to_word.capitalize_words}')"
end
@events = eval(query)

end

event.rb：

  named_scope :in, lambda { |city| { :conditions => { :location => city } } }

  named_scope :about, lambda {
      |category| {
          :joins => :category,
          :conditions => ["categories.name = ?", category]
      }
  }

  named_scope :with, lambda {
      |speaker| {
          :joins => :speakers,
          :conditions => ["speakers.name = ?", speaker]
      }
  }

  named_scope :on, lambda {
      |tag| {
          :joins => :tags,
          :conditions => ["tags.name = ?", tag]
      }
  }

  named_scope :is, lambda {
      |type| {
          :joins => :type,
          :conditions => ["types.name = ?", type]
      }
  }

这给了我像/conferences/in/salt_lake_city/with/joe_shmoe或/notices/about/programming/with/joe_splo/这样的URL，没有特定的顺序。赢