UrlGenerationError 没有路由在一台计算机上匹配，但在另一台计算机上不匹配

Question

我是第一次在 Rails 上学习 Ruby，并且一直在尝试设置我的笔记本电脑以继续我在桌面上的项目。昨天我的笔记本电脑运行 Ruby 通过 rvm 和台式机运行通过 rbenv 遇到了一些问题，所以我解决了这个问题。但是现在，我在我的笔记本电脑上收到以下错误，但在我的笔记本电脑上一切正常。

ActionController::UrlGenerationError in Categories#index

No route matches {:action=>"show", :controller=>"categories", :id=>nil} missing required keys: [:id]

      <table>
        <tr>
          <th class="table-header"><%= link_to 'housing', category_path(@housing) %></th>
        </tr>
        <tr>
          <td>

我相信它应该有效。如果我对代码的理解正确，我将通过传递 @housing 参数通过类别路径链接到我的住房类别。

正如我所说，这适用于我的桌面。

代码如下，在此先感谢您的帮助。

我的 rake routes 命令的输出以及我正在尝试使用的路由...

category GET    /categories/:id(.:format)    categories#show

index.html.erb

<div class="container">
  <div class="leftbar">
    <a href="#"><h1>rubyslist</h1></a>
    <ul>
      <a href="#"><%= link_to 'post a classifieds', new_listing_path %></a>
      <li>my account</li>
    </ul>
      <p>search shiplist</p>
      <%= form_tag search_listings_path, :method => 'get' do %>
      <p>
        <%= text_field_tag :search, params[:search] %>
        <%= submit_tag "Search", :name => nil %>
      </p>
      <% end %>
  </div>
  <div class="center-column" >
    <div class="center-one">
      <table>
        <tr>
          <th class="table-header"><%= link_to 'housing', category_path(@housing) %></th>
        </tr>
        <tr>
          <td>
            <% @housing.subcategories.each do |subcategory| %>
            <ul class="left-list">
              <li><%= link_to subcategory.name, category_subcategory_path(@housing, subcategory) %></li>
            </ul>
            <% end %>
          </td>
        </tr>
      </table>
      <table>
        <tr>
          <th class="table-header"><%= link_to 'roommates', category_path(@roommates) %></th>
        </tr>
        <tr>
          <td>
            <% @roommates.subcategories.each do |subcategory| %>
            <ul>
              <li><%= link_to subcategory.name, category_subcategory_path(@roommates, subcategory) %></li>
            </ul>
            <% end %>
          </td>
        </tr>
      </table>
      <table>
        <tr>
          <th class="table-header"><%= link_to 'for sale', category_path(@forsale) %></th>
        </tr>
        <tr>
          <td>
            <% @forsale.subcategories.each do |subcategory| %>
            <ul class="left-list">
              <li><%= link_to subcategory.name, category_subcategory_path(@forsale, subcategory) %></li>
            </ul>
            <% end %>
          </td>
        </tr>
      </table>
    </div>
  </div>
  <div class="rightbar">
    <!-- Links to the pages via routes match -->
    <ul class="rightbar-top">
      <!-- /help -->
      <li><%= link_to 'help and faq', help_path%></li>
      <li><%= link_to 'avoid scams and fraud', scams_path%></li>
      <li><%= link_to 'personal safety tips', safety_path%></li>
      <li class="rightbar-top"><%= link_to 'terms of use', terms_path%></li>
      <li><%= link_to 'privacy policy', privacy_path%></li>
      <li><%= link_to 'about shiplist', about_path%></li>
      <li><%= link_to 'contact us', contact_path%></li>
    </ul>
  </div>
</div>

routes.rb

  #Creates CRUD actions for categories
  resources :categories do
    #Append sub-categories to categories with CRUD
    resources :subcategories
  end

  #Performs the search
  resources :listings do
    collection do
      get 'search'
    end
  end

  #Set homepage to index of categories
  root 'categories#index'

  #Matches the pages help action to a get request
  #for the help page with page controller in help
  #function of pages controller
  match '/help', to: 'pages#help', via: :get
  match '/scams', to: 'pages#scams', via: :get
  match '/safety', to: 'pages#safety', via: :get
  match '/about', to: 'pages#about', via: :get
  match '/contact', to: 'pages#contact', via: :get
  match '/privacy', to: 'pages#privacy', via: :get
  match '/terms', to: 'pages#terms', via: :get
  match '/subcategories/find_by_category', to: 'subcategories#find_by_category', via: :post
end

categories_controller.rb

class CategoriesController < ApplicationController
    #The index page of our categories controller
    def index
        @categories = Category.all
        @housing = @categories[0]
        @roommates = @categories[1]
        @forsale = @categories[2]
    end

    def show
        @listings = Listing.where(category_id: params[:id])
    end
end

Answer 1

运行命令

rake db:seed

已解决问题。

UrlGenerationError 没有路由在一台计算机上匹配，但在另一台计算机上不匹配

UrlGenerationError No route matches on one computer but not on the other

ruby-on-rails

ruby

ruby-on-rails-4.2