资源和资源方法的区别

Question

resource和resources方法之间的逻辑区别是什么

以下是一些例子:

resource :orders, :only => [:index, :create, :show]

> rake routes
 orders POST       /orders(.:format)            orders#create
        GET        /orders(.:format)            orders#show


resources :orders, :only => [:index, :create, :show]

> rake routes
 orders GET        /orders(.:format)            orders#index
        POST       /orders(.:format)            orders#create
  order GET        /orders/:id(.:format)        orders#show


resource :orders

> rake routes
     orders POST       /orders(.:format)            orders#create
 new_orders GET        /orders/new(.:format)        orders#new
edit_orders GET        /orders/edit(.:format)       orders#edit
            GET        /orders(.:format)            orders#show
            PUT        /orders(.:format)            orders#update
            DELETE     /orders(.:format)            orders#destroy


resources :orders

> rake routes
     orders GET        /orders(.:format)            orders#index
            POST       /orders(.:format)            orders#create
  new_order GET        /orders/new(.:format)        orders#new
 edit_order GET        /orders/:id/edit(.:format)   orders#edit
      order GET        /orders/:id(.:format)        orders#show
            PUT        /orders/:id(.:format)        orders#update
            DELETE     /orders/:id(.:format)        orders#destroy

看起来方法resource不会创建路径index,并且在某些情况下帮助程序是不同的(new_order和new_orders).为什么？

Answer 1

在较高的层面上,目的resource是宣布这些资源中只有一个将存在.例如:

resource :profile, :only => [:edit, :update]

作为用户,我应该只能更新自己的个人资料.我永远不能编辑其他用户的个人资料,因此不需要像以下那样的URL方案/users/1/profile/edit.相反,我使用/profile/edit,并且控制器知道使用当前用户的ID而不是URL中传递的ID(因为没有).

这就是为什么你没有得到一个index动作resource:只有一个资源,所以"列出"它们是没有意义的.

Answer 2

实际上你是对的,resource不应该创建索引操作,除非你明确要求索引操作,这样:

resource :orders, :only => [:index, :create, :show]

助手也应该有所不同,但不如你的例子那么多,因为惯例是使用单一形式的resource方法,复数与resources

resources :orders
=> rake routes

     orders GET        /orders(.:format)            orders#index
            POST       /orders(.:format)            orders#create
  new_order GET        /orders/new(.:format)        orders#new
 edit_order GET        /orders/:id/edit(.:format)   orders#edit
      order GET        /orders/:id(.:format)        orders#show
            PUT        /orders/:id(.:format)        orders#update
            DELETE     /orders/:id(.:format)        orders#destroy

resource :order
=> rake routes
      order POST       /order(.:format)            orders#create
  new_order GET        /order/new(.:format)        orders#new
 edit_order GET        /order/:id/edit(.:format)   orders#edit
            GET        /order/:id(.:format)        orders#show
            PUT        /order/:id(.:format)        orders#update
            DELETE     /order/:id(.:format)        orders#destroy

逻辑上的区别在于声明您在应用程序中逻辑上不能拥有复数资源,例如Admin或其他