没有路由匹配 {:action=>"new", :controller=>"adverts", :userr_id=>nil} 缺少必需的键：[:userr_id]答案

【问题标题】：No route matches {:action=>"new", :controller=>"adverts", :userr_id=>nil} missing required keys: [:userr_id]没有路由匹配 {:action=>"new", :controller=>"adverts", :userr_id=>nil} 缺少必需的键：[:userr_id]
【发布时间】：2015-05-24 22:54:40
【问题描述】：

我是 ruby on rails 的新手，非常感谢任何帮助。我不确定如何解决我的错误。我想我应该在我的控制器中做更多的事情，但我很困惑，因为这是我面临的嵌套资源挑战

我试图在我的视图中查看广告（节目）的详细信息，但是当我单击链接 show 时，我收到以下错误：

No route matches {:action=>"new", :controller=>"adverts", :userr_id=>nil} missing required keys: [:userr_id]

ActionController::UrlGenerationError (No route matches {:action=>"new", :controller=>"adverts", :userr_id=>nil} missing required keys: [:userr_id]):
  app/views/shared/_header_recruiter.html.erb:6:in `_app_views_shared__header_recruiter_html_erb___2254802171992378619_70258749378740'
  app/views/adverts/show.html.erb:1:in `_app_views_adverts_show_html_erb___3448815807687044417_70258749644120'
  app/controllers/adverts_controller.rb:26:in `show'

我在 userr（招聘人员）下嵌套了广告 - routes.rb

Rails.application.routes.draw do
  devise_for :userrs
  resources :userrs do
    resources :adverts
  end

  devise_for :userjs
  root    'static_pages#homepg'
  get     'search',       to: 'static_pages#searchpg'
end

我创建了一个名为 search 的静态页面 - static_pages_controller.rb

class StaticPagesController < ApplicationController
  respond_to :html, :xml, :json

  def searchpg
    @adverts = Advert.all
  end  
end

我的搜索视图文件中有以下编码 - searchpg.html.erb

<div>
  <table>
    <thead>
      <tr>
        <th>Published</th>
        <th>Title</th>
        <th>Content</th>
        <th>City</th>
        <th></th>
      </tr>
    </thead>

    <tbody>
      <% @adverts.each do |advert| %>
        <tr>
          <td><%= advert.created_at.strftime("%B %d, %Y") %></td>
          <td><%= link_to advert.title, '#' %></td>
          <td><%= advert.content %></td>
          <td><%= advert.city %></td>
          <td><%= link_to 'Show', userr_advert_path(advert.userr, advert) %></td>
        </tr>
      <% end %>
    </tbody>
  </table>
</div>

这些是我的路线：

 userr_adverts GET    /userrs/:userr_id/adverts(.:format)          adverts#index
                          POST   /userrs/:userr_id/adverts(.:format)          adverts#create
         new_userr_advert GET    /userrs/:userr_id/adverts/new(.:format)      adverts#new
        edit_userr_advert GET    /userrs/:userr_id/adverts/:id/edit(.:format) adverts#edit
             userr_advert GET    /userrs/:userr_id/adverts/:id(.:format)      adverts#show
                          PATCH  /userrs/:userr_id/adverts/:id(.:format)      adverts#update
                          PUT    /userrs/:userr_id/adverts/:id(.:format)      adverts#update
                          DELETE /userrs/:userr_id/adverts/:id(.:format)      adverts#destroy

我已经有一个广告控制器：

class AdvertsController < ApplicationController
  respond_to :html, :xml, :json
  before_action :set_advert, only: [:show, :edit, :update, :destroy]

  def index
    @userr = Userr.find(params[:userr_id])
    @adverts = @userr.adverts.order("created_at DESC")
    respond_with(@adverts)
  end

  def show
    @userr = Userr.find(params[:userr_id])
    @advert = @userr.adverts.find(params[:id]) 
    respond_with(@advert)
  end

  def new
    @userr = Userr.find(params[:userr_id])
    @advert = @userr.adverts.build
    respond_with(@advert)
  end

  def edit
    @userr = Userr.find(params[:userr_id])
    @advert = @userr.adverts.find(params[:id]) 
  end

  def create
    @userr = Userr.find(params[:userr_id])
    @advert = @userr.adverts.create(advert_params)
    respond_to do |format|
      if @advert.save
        format.html { redirect_to([@advert.userr, @advert], notice: 'Advert was successfully created.') }
        format.json  { render json: @advert, status: :created, location: @advert }
      else
        format.html { render action: "new" }
        format.json  { render json: @advert.errors, status: :unprocessable_entity }
      end
    end
  end

  def update
    @userr = Userr.find(params[:userr_id])
    @advert = @userr.adverts.find(params[:id])
    respond_to do |format|
      if @advert.update_attributes(advert_params)
        format.html { redirect_to([@advert.userr, @advert], notice: 'Advert was successfully updated.') }
        format.json { head :no_content }
      else
        format.html { render action: "edit" }
        format.json { render json: @advert.errors, status: :unprocessable_entity }
      end
    end
  end

  def destroy
    @userr = Userr.find(params[:userr_id])
    @advert = @userr.adverts.find(params[:id])
    @advert.destroy

    respond_to do |format|
      #1st argument reference the path /recruiters/:recruiter_id/adverts/
      format.html { redirect_to(recruiter_adverts_url) }
      format.json  { head :no_content }
    end
  end

  private
    def set_advert
      @advert = Advert.find(params[:id])
    end

    def advert_params
      params.require(:advert).permit(:title, :content, :category_jobtype_id, :category_positiontype_id, :salarystart, :salaryend, :category_country_id, :city, :town, :postcode, :category_editorialapproval_id, :category_applicationrequest_id, :category_advert_id, :userr_id )
    end
end

【问题讨论】：

查看 app/views/shared/_header_recruiter.html.erb:6。尝试使用new_userr_advert(params[:userr_id]) 而不是new_userr_advert

标签： ruby-on-rails ruby ruby-on-rails-4

【解决方案1】：

错误提示 URL 中没有 userr_id，这意味着广告对象没有 userr 对象，或者您可能在手动输入 url 时忘记输入 userr_id。

【讨论】：

【解决方案2】：

您似乎没有advert.userr 对象。检查它的最简单方法是打印它。

所以暂时删除您的link 并打印userr

<% @adverts.each do |advert| %>
    <tr>
      <td><%= advert.created_at.strftime("%B %d, %Y") %></td>
      <td><%= link_to advert.title, '#' %></td>
      <td><%= advert.content %></td>
      <td><%= advert.city %></td>
      <td><%#= link_to 'Show', userr_advert_path(advert.userr, advert) %></td>
       <td><%= advert.userr.inspect %></td>
    </tr>
  <% end %>

因此，如果您看不到任何内容，则意味着您在 userr 和 advert 之间的关系设置不正确。

【讨论】：