没有路由使用嵌套资源相匹配

问题描述

我有两个相关的表。 场地和特价。 A 地点可以有很多的特价。一旦用户创建了一个场地我希望让他们的场馆＃指数页面上创建一个特殊的。通过使用嵌套的资源，我已经取得了预期的网址： /场地/ 5 /特价/新。

不过，我目前的code结果与无路由匹配{：控制器=＆gt;中特价，：格式=＆GT;零}

我猜的错误是我的 SpecialsController 和 DEF新和 DEF创建功能。
我想URL带我去一个表单页面，在这里我可以为特价输入新数据

 ＆LT;％=的link_to'添加特殊'，new_venue_special_path（场地）％GT;APP1 :: Application.routes.draw做  资源：场地做
    资源：特价
结束
高清新
    @venue = Venue.find（PARAMS [：venue_id]）
      @special = @ venue.specials.build
        做的respond_to |格式|
        format.html＃new.html.erb
        format.json {渲染JSON：@special}
       结束
      结束
  打造高清
    @venue = Venue.find（PARAMS [：venue_id]）
    @special = @ venue.specials.build（PARAMS [：专用]）
    做的respond_to |格式|
      如果@ special.save
        format.html {redirect_to的@special，注意：特别创建成功。 }
        format.json {渲染JSON：@special，状态：创建，地点：@special}
      其他
        format.html {渲染动作：新}
        format.json {渲染JSON：@ special.errors，状态：unprocessable_entity}
      结束
    结束
  结束
 

回溯

 入门GET/场地/ 4 /特价/新的127.0.0.1在2011-12-06 23点36分01秒+0200
  处理由SpecialsController＃新的HTML
  参数：{venue_id=＆gt;中4}
  [1分[36mVenue负荷（在0.2ms）[0分[1mSELECT场地。* FROM场馆WHERE场地，ID= $ 1 LIMIT 1 [0分[[ID，4]]
呈现特价/​​ _form.html.erb（1.9ms）
呈现特价/​​布局内new.html.erb /应用程序（2.6ms）
在97ms完成500内部服务器错误::的ActionView ::模板错误（没有路由匹配{：控制器=＆gt;中特价，：格式=＆GT;无}）：
    1：＆LT;％=的form_for（@special）做| F | ％GT;
    2：＆LT;％@如果special.errors.any？ ％GT;
    3：或其可格ID =ERROR_EXPLANATION＆GT;
    4：其中H 2＆GT;＆下;％=复数（@ special.errors.count，错误）％＆GT;禁止这个特殊的被保存：LT; / H＆GT;
  应用程序/视图/专辑/ _form.html.erb：1：`_app_views_specials__form_html_erb__2784079234875518470_70162904892440
  应用程序/视图/专辑/ new.html.erb：7：`_app_views_specials_new_html_erb__115378566176177893_70162906293160
  应用程序/控制器/ specials_controller.rb：30：在`新'呈现/Users/andrewlynch/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.1.3/lib/action_dispatch/middleware/templates/rescues/routing_error.erb救援内/布局（为0.7m​​s）
 

解决方案

  redirect_to的@special
 

这将默认为specials_path，但你使用venue_special_path

你可能想：

  redirect_to的[@venue，@special]
 

和形式，您将需要相同的：

 ＆LT;％=的form_for（[@场地，@special]）做| F | ％GT;
 

基本上 - 问题是，你有一个嵌套的资源......这意味着每个你在哪里声明一个URL路径（包括类似的form_for隐含的地方）处有与@venue和@special两者代替，而不只是@special。

您可能会遇到同样的错误在其他地方产生的脚手架code ......只是做同样的事情，你应该是不错的。

I have two associated tables. Venues and Specials. A venue can have many specials. Once a user has created a venue I wish to allow them to create a special on the venues#index page. By using nested resources I have achieved the desired URL: /venues/5/specials/new.

However, my current code results with: No route matches {:controller=>"specials", :format=>nil}

I'm guessing the error is with my SpecialsController and the def new and def create functions.I would like the URL to take me to a form page where I can enter new data for the specials

<%= link_to 'Add Special', new_venue_special_path(venue) %>



App1::Application.routes.draw do

  resources :venues do
    resources :specials
end


def new
    @venue = Venue.find(params[:venue_id])
      @special = @venue.specials.build
        respond_to do |format|
        format.html # new.html.erb
        format.json { render json: @special }
       end
      end


  def create
    @venue = Venue.find(params[:venue_id])
    @special = @venue.specials.build(params[:special])


    respond_to do |format|
      if @special.save
        format.html { redirect_to @special, notice: 'Special was successfully created.' }
        format.json { render json: @special, status: :created, location: @special }
      else
        format.html { render action: "new" }
        format.json { render json: @special.errors, status: :unprocessable_entity }
      end
    end
  end

Backtrace

Started GET "/venues/4/specials/new" for 127.0.0.1 at 2011-12-06 23:36:01 +0200
  Processing by SpecialsController#new as HTML
  Parameters: {"venue_id"=>"4"}
  [1m[36mVenue Load (0.2ms)[0m  [1mSELECT "venues".* FROM "venues" WHERE "venues"."id" = $1 LIMIT 1[0m  [["id", "4"]]
Rendered specials/_form.html.erb (1.9ms)
Rendered specials/new.html.erb within layouts/application (2.6ms)
Completed 500 Internal Server Error in 97ms

ActionView::Template::Error (No route matches {:controller=>"specials", :format=>nil}):
    1: <%= form_for(@special) do |f| %>
    2:   <% if @special.errors.any? %>
    3:     <div id="error_explanation">
    4:       <h2><%= pluralize(@special.errors.count, "error") %> prohibited this special from being saved:</h2>
  app/views/specials/_form.html.erb:1:in `_app_views_specials__form_html_erb__2784079234875518470_70162904892440'
  app/views/specials/new.html.erb:7:in `_app_views_specials_new_html_erb__115378566176177893_70162906293160'
  app/controllers/specials_controller.rb:30:in `new'

Rendered /Users/andrewlynch/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.1.3/lib/action_dispatch/middleware/templates/rescues/routing_error.erb within rescues/layout (0.7ms)

解决方案

redirect_to @special

this will default to "specials_path", but you're using venue_special_path

you probably want:

redirect_to [@venue, @special]

and in the form you will need the same:

<%= form_for([@venue, @special]) do |f| %>

basically - the issue is that you have a nested resource... which means that every place where you are declaring a url path (including implicit places like form_for) has to be replaced with both the @venue and the @special, instead of just the @special.

you may come across this same "bug" elsewhere in your generated scaffold code... just do the same thing and you should be good.

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