删除嵌套关联的 URL

Question

我在 Rails 中有以下多对多关系（当然是 ActiveResource）：

class User < ...
  has_many :channel_assignments
  has_many :channels, :through => :channel_assignments
end


class Channel < ...
  has_many :channel_assignments
  has_many :users :through => :channel_assignments
end

class ChannelAssignment < ...
  belongs_to :user
  belongs_to :channel
end

定义路线：

map.resources :users, :has_many => :channel_assignments

更新： rake routes 给出以下输出：

       user_channel_assignments GET    /users/:user_id/channel_assignments(.:format)                                 {:action=>"index", :controller=>"channel_assignments"}
                                POST   /users/:user_id/channel_assignments(.:format)                                 {:action=>"create", :controller=>"channel_assignments"}
    new_user_channel_assignment GET    /users/:user_id/channel_assignments/new(.:format)                             {:action=>"new", :controller=>"channel_assignments"}
   edit_user_channel_assignment GET    /users/:user_id/channel_assignments/:id/edit(.:format)                        {:action=>"edit", :controller=>"channel_assignments"}
        user_channel_assignment GET    /users/:user_id/channel_assignments/:id(.:format)                             {:action=>"show", :controller=>"channel_assignments"}
                                PUT    /users/:user_id/channel_assignments/:id(.:format)                             {:action=>"update", :controller=>"channel_assignments"}
                                DELETE /users/:user_id/channel_assignments/:id(.:format)                             {:action=>"destroy", :controller=>"channel_assignments"}

由于 ChannelAssignemnts 绑定到用户，我使用我的脚手架 ChannelAssignmentsController 在创建 ChannelAssignment 时自动将用户分配给通道。

我通过使用这些 URL 来做到这一点：

#/app/views/users/index.html.erb
#show a link to view all channels of a user
<%= link_to 'Channels', user_channel_assignments_path(user) %>
...

#/app/views/channel_assignments/new.html.erb
#assign a channel to currently selected user
<% form_for(@channel_assignment, :url => user_channel_assignments_path(@user) ) do |f| %>
...

这很迷人。

但是：取消分配频道的路径是什么，ergo：删除用户的 ChannelAssignment？运行 rake 路由时找不到它。

必须是类似的东西

<%= link_to 'Destroy', delete_user_channel_assignment, :user_id => @user, :method => :delete %>

对此有何意见？我确信有一种方法可以自动生成此 URL。

谢谢

马特

Answer 1

您只需要在链接中使用删除动词：

<%= link_to 'Destroy', user_channel_assignment(:user_id => @user, :id => @channel), :method => :delete %>

它也应该在 rake 路由中可见 - 只需使用 delete 动词。