在Rails中限制路由到嵌套資源

Question

我想創建嵌套的資源，其中的子資源沒有自己的存在。例如鏈接到Person的Address資源。

我的路線聲明看起來像這樣：

map.resources :persons, 
:has_many => :addresses 

這使我有以下途徑：

   person_addresses GET /persons/:person_id/addresses     {:controller=>"addresses", :action=>"index"} 
    formatted_person_addresses GET /persons/:person_id/addresses.:format   {:controller=>"addresses", :action=>"index"} 
           POST /persons/:person_id/addresses     {:controller=>"addresses", :action=>"create"} 
           POST /persons/:person_id/addresses.:format   {:controller=>"addresses", :action=>"create"} 
      new_person_address GET /persons/:person_id/addresses/new    {:controller=>"addresses", :action=>"new"} 
formatted_new_person_address GET /persons/:person_id/addresses/new.:format  {:controller=>"addresses", :action=>"new"} 
      edit_person_address GET /persons/:person_id/addresses/:id/edit   {:controller=>"addresses", :action=>"edit"} 
formatted_edit_person_address GET /persons/:person_id/addresses/:id/edit.:format {:controller=>"addresses", :action=>"edit"} 
       person_address GET /persons/:person_id/addresses/:id    {:controller=>"addresses", :action=>"show"} 
    formatted_person_address GET /persons/:person_id/addresses/:id.:format  {:controller=>"addresses", :action=>"show"} 
           PUT /persons/:person_id/addresses/:id    {:controller=>"addresses", :action=>"update"} 
           PUT /persons/:person_id/addresses/:id.:format  {:controller=>"addresses", :action=>"update"} 
           DELETE /persons/:person_id/addresses/:id    {:controller=>"addresses", :action=>"destroy"} 
           DELETE /persons/:person_id/addresses/:id.:format  {:controller=>"addresses", :action=>"destroy"} 

現在我要確保，一個人的地址是隻讀的，也就是說，我只需要對地址使用show和index操作。

我嘗試這樣做：

map.resources :persons, 
    :has_many => :addresses, 
    :collection => { :addresses => [ :show, :index ] } 

，並得到這個錯誤：

(in /home/rmk/app) 
rake aborted! 
Invalid HTTP method specified in route conditions: {:method=>:show} 

(See full trace by running task with --trace) 

有沒有什麼辦法可以做到這一點？

編輯： 我的主要問題是，我沒有正確使用代碼塊（我想盡可能使用has_one等）。所以我persons路線是這樣的（有點人爲的例子）：

map.resources :persons, :has_one => :ssn, :except => [:new, :edit] do |person| 
person.resources :addresses, :only => [:index, :show] 
end 

Answer 1

這是你想要做什麼？

map.resources :persons do |person| 
    person.resources :addresses, :only => [:index, :show] 
end 

這創建地址作爲個人的嵌套資源，但僅使索引和顯示視圖可用。