嵌套路由没有匹配的路由，但Rake路由中存在路由

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Started GET "/classifieds/12/questions/new" for 127.0.0.1 at 2014-07-18 10:55:27 -0400
Processing by QuestionsController#new as HTML
  Parameters: {"classified_id"=>"12"}
  Classified Load (0.5ms)  SELECT "classifieds".* FROM "classifieds" WHERE "classifieds"."id" = $1 LIMIT 1  [["id", "12"]]
  Rendered questions/new.html.erb within layouts/application (2.5ms)
Completed 500 Internal Server Error in 35ms

TypeError - can't convert Symbol into Integer:

我有一个belongs_to :classified的问题模型和一个has_many :questions的分类模型。

因此，我在routes.rb中执行嵌套路由

  resources :classifieds do 
    resources :questions
  end

正因为如此，当我做耙路的时候，我会得到这些新的路线。

 classified_questions GET    /classifieds/:classified_id/questions(.:format)                               questions#index
                                                        POST   /classifieds/:classified_id/questions(.:format)                               questions#create
                                new_classified_question GET    /classifieds/:classified_id/questions/new(.:format)                           questions#new
                               edit_classified_question GET    /classifieds/:classified_id/questions/:id/edit(.:format)                      questions#edit
                                    classified_question GET    /classifieds/:classified_id/questions/:id(.:format)                           questions#show
                                                        PUT    /classifieds/:classified_id/questions/:id(.:format)                           questions#update
                                                        DELETE /classifieds/:classified_id/questions/:id(.:format)                           questions#destroy

我正在浏览指南中的嵌套资源部分。新问题应该给我一个表单，我可以在那里张贴到questions#create，这允许我张贴问题到数据库，属于一个特定的分类广告。

在模式中的问题表中，我添加了这个挂钩。

t.integer  "classifieds_id"

*我没有分类控制器。

这是我的控制器，它正在呈现显示方法。

class UplatzPlacesController < ApplicationController
  require 'balanced'
    helper_method :countries
  def show
    @classified=Classified.find(params[:id])
  end
end

show.html.erb向用户显示分类广告，在底部有一个link_to

 <%= link_to "Post a question", new_classified_question_path(@classified.id) %>

我生成了自己的问题控制器

class QuestionsController < ApplicationController

  def index
  end

  def new
    @classified = Classified.find(params[:classified_id])
    @question = Question.new 
  end 

  def create
    @classified = Classified.find(params[:classified_id])
    @question = Question.new(params[:question])
    @classified.questions << @question
    if @question.save 
      flash[:notice] = "Question has been posted"
    else
      flash[:notice] = "It did not go through"
    end
  end
end

当我单击link_to时，我确实看到了表单，并且url变成如下

classifieds/12/questions/new #shows that id got passed correctly

但是，当我单击submit时，我将得到这个路由错误。

Routing Error

No route matches [POST] "/classifieds/12/questions/new"

*每条路线都有邮政。

这是我的观点/问题中的new.html.erb

<%=form_for @question, :url => new_classified_question_path do |f| %>
      <fieldset>
        <ul id='posting_question_form'>
          <li>
            <%=f.label :question_body, 'Post Your Question To Seller:'%>
            <%= f.text_area :question_body, :cols=>40, :rows=>50 %>
          </li>
        </ul>
      </fieldset>
      <div>
      <%= f.submit "Post Question", :class => 'goButton', :style => 'width:auto;float:right;' %>
      </div>
  <% end %>
</div>

我在问题模型中设置了大量赋值的属性。

attr_accessible :question_body, :classifieds_id

它应该能用，但它不管用。

另外，应用程序是gem 'rails', '3.2.13'

Answer 1

您正在使用错误的URL帮助程序：

new_classified_question_path

此助手将导致嵌套在new中的控制器questions的classified操作。( Rails中的URL的结构如下：<action>_<parent_controller>_<controller_name>_path或以_url而不是_path结尾)。

你应该使用：

form_for @question, classified_questions_path(@classified) do |f|

给你的指南：helpers.html

Answer 2

在你的新控制器上，应该提出一个新的问题

# GET /classifieds/:classified_id/questions/new
def new
  # 1st you retrieve the classified to params[:classified_id]
  @classified = Classified.find(params[:classified_id])     
  # 2nd you build a new one of question
  @question = @classified.questions.build
end

# POST /classifieds/:classified_id/questions
def create
  # 1st you retrieve the classified to params[:classified_id]
  @classified = Classified.find(params[:classified_id])
  #2nd you create the question with arguments in params[:question]
  @question = @classified.questions.create(params[:question])
  respond_to do |format|
   if @question.save 
     # redirection to the Question resource
     format.html { redirect_to([@question.classified, @question], :notice => 'Question has been posted.')
     # or redirection to the list of Questions
     # redirect_to(classified_@questions_url)
   else
     format.html { 
       flash[:error] = "It did not go through"
       render :action => "new" 
     } 
   end
  end
end

以及新的形式

<%= form_for([@question.classified, @question]) do |f| %>
   ....
<% end %>

另一种创建嵌套资源的方法：在rails 3中创建嵌套资源，并更新脚手架链接和重定向