rails中的路由问题

Question

//见下文

错误:

No route matches {:controller=>"conversations", :action=>"reply", :id=>nil, :board_id=>nil}

参数转储:

{"board_id"=>"2",
 "id"=>"3"}

日志:

Started GET "/boards/2/conversations/3/reply" for 127.0.0.1 at Mon Apr 04 23:40:59 +0200 2011
  Processing by ConversationsController#reply as HTML
  Parameters: {"board_id"=>"2", "id"=>"3"}
  Board Load (0.1ms)  SELECT "boards"."id" FROM "boards" WHERE ("boards"."id" = 2) LIMIT 1
  Board Load (0.6ms)  SELECT "boards".* FROM "boards" WHERE ("boards"."id" = 2) LIMIT 1
Rendered conversations/_reply_form.html.erb (1.3ms)
Rendered conversations/reply.html.erb within layouts/application (9.4ms)
Completed   in 30ms
ActionView::Template::Error (No route matches {:controller=>"conversations", :action=>"reply", :id=>nil, :board_id=>nil}):
    1: <%= form_for(@comment, :url => reply_board_conversation_url(:board_id=>@board_id, :id=>@conversation_id)) do |f| %>
    2:   <% if @comment.errors.any? %>
    3:     <div id="error_explanation">
    4:       <h2><%= pluralize(@comment.errors.count, "error") %> prohibited this reply from being saved:</h2>
  app/views/conversations/_reply_form.html.erb:1:in `_app_views_conversations__reply_form_html_erb__999049254_2171331720_2303070'
  app/views/conversations/reply.html.erb:4:in `_app_views_conversations_reply_html_erb___838091718_2171408600_0'
Rendered /opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.1ms)
Rendered /opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (982.1ms)
Rendered /opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/templates/rescues/template_error.erb within rescues/layout (1001.7ms)

在我的路线。rb,:

  get '/boards/:board_id/conversations/:id/reply' => "conversations#reply", :as => :reply_board_conversation
  post '/boards/:board_id/conversations/:id/reply' => "conversations#save_reply", :as => :reply_board_conversation
  resources :boards do 
    resources :conversations
  end

有人知道我做错了什么吗?提前感谢!

//更新:

计算出参数。但是，现在我们有一个新的错误。看到输出:

Started GET "/boards/2/conversations/3/reply" for 127.0.0.1 at Tue Apr 05 11:29:52 +0200 2011
  Processing by ConversationsController#reply as HTML
  Parameters: {"board_id"=>"2", "conversation_id"=>"3"}
  Board Load (0.2ms)  SELECT "boards"."id" FROM "boards" WHERE ("boards"."id" = 2) LIMIT 1
  Board Load (0.2ms)  SELECT "boards".* FROM "boards" WHERE ("boards"."id" = 2) LIMIT 1
Rendered conversations/_reply_form.html.erb (4.3ms)
Rendered conversations/reply.html.erb within layouts/application (6.3ms)
Completed   in 26ms
ActionView::Template::Error (undefined method `model_name' for NilClass:Class):
    1: <%= form_for(@comment, :url => reply_board_conversation_url(:board_id=>@board.id, :id=>@conversation_id)) do |f| %>
    2:   <% if @comment.errors.any? %>
    3:     <div id="error_explanation">
    4:       <h2><%= pluralize(@comment.errors.count, "error") %> prohibited this reply from being saved:</h2>
  app/views/conversations/_reply_form.html.erb:1:in `_app_views_conversations__reply_form_html_erb__999049254_2174448800_2303070'
  app/views/conversations/reply.html.erb:1:in `_app_views_conversations_reply_html_erb___838091718_2174498080_0'
Rendered /opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.1ms)
Rendered /opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (757.4ms)
Rendered /opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/templates/rescues/template_error.erb within rescues/layout (774.2ms)

Answer 1

您提供的日志指示@board_id和@conversation_id变量为nil

确保您在ConversationsController的应答动作中实际设置了@board_id和@conversation_id的值。我怀疑你要么填充board_id，要么忘记做@board_id = params[:board_id]之类的事情。

为了回答你问题的下一部分，我猜@comment没有被实例化。在你的控制器动作的某个地方，你应该做如下的事情:

@comment = Comment.new(params[:comment]

这将根据任何现有的表单数据创建一个注释，如果没有任何表单数据，则创建一个新注释。

Answer 2

您的@board_id和@conversation_id变量都是nil，因为它在错误消息中说:

No route matches {:controller=>"conversations", 
                  :action=>"reply",
                  :id=>nil,
                  :board_id=>nil
                 }

注意这里的:id和:board_id参数