Ruby on rails 轨道布线-：操作=>'；新'；返回错误“；同一控制器中没有与{:action=>；“show”匹配的路由

我正在为一个名为“ExternalDatabase”的模型编写代码

模型文件中没有类声明之外的代码。我为index、new、show和_form.html.erb添加了视图页面

config/routes.rb包含行

resources:external_databases

。此时该模型不包含嵌套资源。此应用程序中声明了其他模型，但目前没有任何模型与此模型交互，并且在声明

resources:external之前，这些模型都经过测试，功能正常且已关闭_数据库

我在索引视图中有一个指向

new\u external\u database\u path

的链接，如果我的操作正确，它的行为与

{:action=>“new”，：controller=>“external\u database”}

完全相同

理论上，这应该加载应用程序/外部\u数据库/new，它将呈现

\u form.html.erb

。

\u form

的第一行是

在使用指向/new的链接时，会出现文章标题中所述的问题。url应用程序/external_databases/new有以下错误：

没有路由匹配{:action=>“show”，:controller=>“external_databases”}

当我使用

rails控制台

创建数据成员时，它通过索引和显示正确显示。相同的

\u表单

文件由

编辑

方法使用，并成功编辑控制台创建的数据成员。还可以销毁功能

…那么为什么它不承认新方法呢

此型号的我的控制器代码：

    class ExternalDatabasesController < ApplicationController

     def index 
      @external_databases = ExternalDatabase.all

      respond_to do |format|  
       format.html # index.html.erb
       format.json { render :json => @external_databases }
      end
     end

     # POST /external_databases
     # POST /external_databases.json

     def new 
      @external_database = ExternalDatabase.new

      respond_to do |format|
       format.html # new.html.erb
       format.json { render :json => @external_database }
      end
     end

     def show
      @external_database = ExternalDatabase.find(params[:id])

      respond_to do |format| 
       format.html # show.html.erb
       format.json {render :json => @external_database }
      end
     end

     def create
      @external_database = ExternalDatabase.new(params[:external_database])

      respond_to do |format|
       if @external_database.save
        format.html {redirect_to @external_database, :notice => "New External Database         Profile was created successfully!"}
        format.json {render :json => @external_database, :status => :created, :location => @external_database}
       else
        format.html {render :action => "new"}
        format.json { render :json => @external_database.errors, :status =>         :unprocessable_entity }
       end
      end
     end


     #GET /external_databases/1/edit
     def edit
      @external_database = ExternalDatabase.find(params[:id])
     end

     # PUT /external_databases/1
     # PUT /external_databases/1.json
     def update 
      @external_database = ExternalDatabase.find(params[:id])

      respond_to do |format|
       if @external_database.update_attributes(params[:external_database])
        format.html {redirect_to @external_database, :notice => "External Database         Profile was updated successfully!" }
        format.json {head :ok}
       else 
        format.html { redner :action => "edit" }
        format.json {render :json => @external_database.errors, :status =>         :unprocessable_entity }
       end
      end
     end


     # DELETE /external_databases/1
     # DELETE /external_databases/1.json
     def destroy
      @external_database = ExternalDatabase.find(params[:id])
      @external_database.destroy

      respond_to do |format| 
       format.html { redirect_to external_databases_rul }
       format.json { head :ok }
      end
     end

    end

观点：

外部数据库表格

    <%= form_for(@external_database) do |f| %>

     <div class="field">
      <%= f.label :name %><br/>
      <%= f.text_field :name %><br/>
     </div>
     <div class="field">
      <%= f.label :description %><br/>
      <%= f.text_field :description %><br/>
     </div>
     <div class="field">
      <%= f.label :url %><br/>
      <%= f.text_field :url %><br/>
     </div>
     <div class="actions">
       <%= f.submit %>
     </div>
    <% end %>

index.html.erb

    <p id="notice"><%= notice %></p>
    <h1>External Databases</h1>

    <table border="1">
     <tr>
      <th>Database Name</th>
     </tr>
     <% @external_databases.each do |exdb| %>
      <tr>
       <td><%= exdb.name %></td>
       <td><%= truncate(exdb.description) %></td>
       <td><%= link_to 'Show', exdb %></td>
       <!-- link_to.... :target => "_blank" will open the url in a new window -->
       <td><%= link_to 'Visit', exdb.url, :target => "_blank" %></td>  
       <td><%= link_to 'Edit', edit_external_database_path(exdb)%></td>
       <td><%= link_to 'Destroy', exdb, :confirm => 'Are you sure?', :method => :delete %></td>
      </tr>
     <% end %>
    </table>

    <br/>
    <%= link_to 'New External Database Profile', { :action => "new", :controller => "external_databases" }%> | 
    <%= link_to 'Home', root_path %>

外部数据库
数据库名称
“_blank”%>
“你确定吗？”，：method=>：delete%>


“新建”，控制器=>“外部_数据库”}%>|

new.html.erb

    <h1>Creating a new External Database Profile</h1>

    <%= render 'form' %>

    <%= link_to 'Back', external_database_path %>

    <p id="notice"><%= notice %></p>

    <table cellspacing="3" cellpadding="5" border="1">
     <tr> 
      <th><b>External Database Name</b></th>
      <th><b>Database ID</b></th>
     </tr>
     <tr>
      <td><%= @external_database.name %></td>
      <td><%= @external_database.id %></td>
     </tr>
     <tr colspan="2">
      <th><b>URL</b></th>
     </tr>
     <tr colspan="2">
      <td><%= @external_database.url %></td>
      <td><%= link_to 'Visit External Database', @external_database.url %></td>
     </tr>
    </table>



    <p>
     <h3>Description</h3>
     <!% @external_database.description.split.scan(/.{,60}/).each do |line| %>
      <!%= line %><br/>
     <!% end %>
    </p>

    <br /><br /><br />
    <%= link_to 'Back to External Database Index', external_databases_path %> |
    <%= link_to 'Edit', edit_external_database_path(@external_database) %> | 
    <%= link_to 'Destroy', :confirm => 'Are you sure?', :method => :delete %>

<h1>Creating a new External Database Profile</h1>

<%= render 'form' %>

<%= link_to 'Back', external_databases_path %>

创建新的外部数据库配置文件

show.html.erb

    <h1>Creating a new External Database Profile</h1>

    <%= render 'form' %>

    <%= link_to 'Back', external_database_path %>

    <p id="notice"><%= notice %></p>

    <table cellspacing="3" cellpadding="5" border="1">
     <tr> 
      <th><b>External Database Name</b></th>
      <th><b>Database ID</b></th>
     </tr>
     <tr>
      <td><%= @external_database.name %></td>
      <td><%= @external_database.id %></td>
     </tr>
     <tr colspan="2">
      <th><b>URL</b></th>
     </tr>
     <tr colspan="2">
      <td><%= @external_database.url %></td>
      <td><%= link_to 'Visit External Database', @external_database.url %></td>
     </tr>
    </table>



    <p>
     <h3>Description</h3>
     <!% @external_database.description.split.scan(/.{,60}/).each do |line| %>
      <!%= line %><br/>
     <!% end %>
    </p>

    <br /><br /><br />
    <%= link_to 'Back to External Database Index', external_databases_path %> |
    <%= link_to 'Edit', edit_external_database_path(@external_database) %> | 
    <%= link_to 'Destroy', :confirm => 'Are you sure?', :method => :delete %>

<h1>Creating a new External Database Profile</h1>

<%= render 'form' %>

<%= link_to 'Back', external_databases_path %>

外部数据库名称
数据库ID
统一资源定位地址

描述







|
| 
“你确定吗？”，：method=>：delete%>

您的“返回”链接中的新.html.erb文件有一个输入错误。应该是：

external_databases_path

您可以将其与上面show.html.erb中您自己的反向链接进行比较

修正：new.html.erb

    <h1>Creating a new External Database Profile</h1>

    <%= render 'form' %>

    <%= link_to 'Back', external_database_path %>

    <p id="notice"><%= notice %></p>

    <table cellspacing="3" cellpadding="5" border="1">
     <tr> 
      <th><b>External Database Name</b></th>
      <th><b>Database ID</b></th>
     </tr>
     <tr>
      <td><%= @external_database.name %></td>
      <td><%= @external_database.id %></td>
     </tr>
     <tr colspan="2">
      <th><b>URL</b></th>
     </tr>
     <tr colspan="2">
      <td><%= @external_database.url %></td>
      <td><%= link_to 'Visit External Database', @external_database.url %></td>
     </tr>
    </table>



    <p>
     <h3>Description</h3>
     <!% @external_database.description.split.scan(/.{,60}/).each do |line| %>
      <!%= line %><br/>
     <!% end %>
    </p>

    <br /><br /><br />
    <%= link_to 'Back to External Database Index', external_databases_path %> |
    <%= link_to 'Edit', edit_external_database_path(@external_database) %> | 
    <%= link_to 'Destroy', :confirm => 'Are you sure?', :method => :delete %>

<h1>Creating a new External Database Profile</h1>

<%= render 'form' %>

<%= link_to 'Back', external_databases_path %>

创建新的外部数据库配置文件

我也有类似的问题。按照这里的指示，运气不好。在提交代码表单的底部，我有“新建”和“删除”按钮。我的“新建”生成了一个错误，因为有一个不可靠的删除按钮：/。无论如何，我至少可以对此进行注释，以使新按钮正常工作，然后集中精力调试删除按钮

  = f.submit "Submit", class: "btn btn-large btn-primary"
  = link_to 'Create New', new_matrix_header_path, class: 'btn btn-primary'
  -#= link_to 'Delete', matrix_header_path(@matrix_header), method: :delete, data: { confirm: 'Are you sure?'}, class: 'btn btn-danger'

我查看了堆栈，发现它在视图的第13行开始出现错误，这是带有删除按钮的行

Started GET "/matrix_headers/new" for 127.0.0.1 at 2014-10-28 21:08:48 +1000
Processing by MatrixHeadersController#new as HTML
  User Load (0.2ms)  SELECT  `users`.* FROM `users`  WHERE `users`.`id` = 1  ORDER BY `users`.`id` ASC LIMIT 1
  Rendered shared/_error_messages.html.erb (0.4ms)
  Rendered matrix_headers/_form.html.haml (21.0ms)
  Rendered matrix_headers/new.html.haml within layouts/application (22.6ms)
Completed 500 Internal Server Error in 36ms

ActionController::UrlGenerationError - No route matches {:action=>"show", :controller=>"matrix_headers", :format=>nil, :id=>#<MatrixHeader id: nil>} missing required keys: [:id]:
  actionpack (4.1.1) lib/action_dispatch/journey/formatter.rb:39:in `generate'
  actionpack (4.1.1) lib/action_dispatch/routing/route_set.rb:597:in `generate'
  actionpack (4.1.1) lib/action_dispatch/routing/route_set.rb:627:in `generate'
  actionpack (4.1.1) lib/action_dispatch/routing/route_set.rb:663:in `url_for'
  actionpack (4.1.1) lib/action_dispatch/routing/url_for.rb:155:in `url_for'
  actionview (4.1.1) lib/action_view/routing_url_for.rb:83:in `url_for'
  actionpack (4.1.1) lib/action_dispatch/routing/route_set.rb:228:in `call'
  actionpack (4.1.1) lib/action_dispatch/routing/route_set.rb:179:in `call'
  actionpack (4.1.1) lib/action_dispatch/routing/route_set.rb:268:in `block (2 levels) in define_url_helper'
   () media/jay/DATA/rails_projects/my_app/app/views/matrix_headers/_form.html.haml:13:in `block in _app_views_matrix_headers__form_html_haml__2669648707298145379_8667520'

2014年10月28日21:08:48+1000时127.0.0.1版的开始获取“/matrix_headers/new” MatrixHeadersController处理#新为HTML 用户加载（0.2ms）从“用户”中选择“用户”。“id”=1“用户”的订单。`id`ASC限制1 呈现的共享/_error_messages.html.erb（0.4ms） 渲染矩阵标题/_form.html.haml（21.0ms） 布局/应用程序中的渲染矩阵_头/new.html.haml（22.6ms） 在36毫秒内完成500个内部服务器错误 ActionController:：UrlGenerationError-没有路由匹配{：action=>“show”，：controller=>“matrix_headers”，：format=>nil，：id=>#}缺少必需的键：[：id]： actionpack（4.1.1）lib/action\u dispatch/journey/formatter.rb:39:in'generate' actionpack（4.1.1）lib/action_dispatch/routing/route_set.rb:597:in'generate' actionpack（4.1.1）lib/action\u dispatch/routing/route\u set.rb:627:in'generate' actionpack（4.1.1）lib/action\u dispatch/routing/route\u set.rb:663:in'url\u for' actionpack（4.1.1）lib/action\u dispatch/routing/url\u for.rb:155:in'url\u for' actionview（4.1.1）lib/action\u view/routing\u url\u for.rb:83:in'url\u for' actionpack（4.1.1）lib/action\u dispatch/routing/route\u set.rb:228:in'call' actionpack（4.1.1）lib/action\u dispatch/routing/route\u set.rb:179:in'call' actionpack（4.1.1）lib/action\u dispatch/routing/route\u set.rb:268:define\u url\u helper中的block（2层）中 （）media/jay/DATA/rails_projects/my_app/app/views/matrix_headers/_form.html.haml:13:in`block in_app_views_matrix_headers_form_html_haml_2669648707298145379_8667520'

---

通过注释删除按钮，它现在可以正确地路由到new，而无需转到

No route matches{：action=>“show”

错误。

很想知道如果添加

new\u external\u databases\u path

（databases是复数形式）这是否有效相反，@johnernaut

数据库

对于新的路由不会是复数。请快速检查路由文件并运行

rake routes

…只有

索引

和

创建

操作是复数。我明白了。感谢您的澄清。您上面描述的内容应该有效。您确定没有输入错误吗ewhere或您在问题中遗漏了我们没有看到的内容？

external\u database\u path（@external\u database）

应为

外部数据库#显示

操作，

新建外部数据库#路径

应为

外部数据库#新建

操作。请显示您的routes.rb并查看添加的文件。感谢您的帮助。