rails resource control and path

gistfile1.md

Rails用這套慣例來大大簡化了路由設定。那程式該怎麼寫呢? 我們在config/routes.rb加入以下一行程式：

resources :events

如此就會自動建立四個命名路由(named routes)，搭配四個HTTP動詞，對應到七個Actions。它的實際作用，就如同以下的設定：

get    '/events'          => "events#index",   :as => "events"
post   '/events'          => "events#create",  :as => "events"
get    '/events/:id'      => "events#show",    :as => "event"
put    '/events/:id'      => "events#update",  :as => "event"
delete '/events/:id'      => "events#destroy", :as => "event"
get    '/events/new'      => "events#new",     :as => "new_event"
get    '/events/:id/edit' => "events#edit",    :as => "edit_event"

用這張表格會更清楚：

Helper	GET	POST	PUT	DELETE
event_path(@event)	/events/1 show action		/events/1 update action	/events/1 destroy action
events_path	/events index action	/events create action
edit_event_path(@event)	/events/1/edit edit action
new_event_path	/events/new new action

注意到這七個Action方法的名字，Rails是定好的，無法修改。這一套慣例建議你背起來，你可以這樣記憶：

• show、new、edit、update、destroy是單數，對單一元素操作
• index、create是複數，對群集操作
• event_path(@event)需要參數，根據HTTP動詞決定show、update、destroy
• events_path毋需參數，根據HTTP動詞決定index、create

from http://ihower.tw/rails3/restful.html