ruby-on-rails – Rails Routing – ：action =>’new’返回错误“没有路由匹配{：action =>”show“…在同一个控制器中

概述我正在为名为“External Database”的模型编写代码. 模型文件在类声明之外没有代码.我添加了index,new,show和_form .html.erb的视图页面. config / routes.rb包含行资源：external_databases.该模型目前不包含嵌套资源.此应用程序中还声明了其他模型,但目前它们都没有与此模型交互,并且在声明资源之前它们都经过测试并且功能和关闭： 我正在为名为“External Database”的模型编写代码.

模型文件在类声明之外没有代码.我添加了index,new,show和_form .HTML.erb的视图页面.

config / routes.rb包含行资源：external_databases.该模型目前不包含嵌套资源.此应用程序中还声明了其他模型,但目前它们都没有与此模型交互,并且在声明资源之前它们都经过测试并且功能和关闭：external_databases.

我有一个从索引视图到new_external_database_path的链接,其行为与{：action =>完全相同“new”,：controller => “external_database”}如果我正确关注.

这理论上应该加载application / external_databases / new,它将呈现_form.HTML.erb. _form的第一行是<％= form_for(@ external_database)do | f | ％GT; 使用/ new链接时会出现帖子标题中所述的问题. url application / external_databases / new出现以下错误： 没有路线匹配{：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. edit方法使用相同的_form文件,并成功编辑控制台创建的数据成员.毁灭也功能.

……那么为什么不认识新方法呢？

我的这个模型的控制器代码：

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

更新：添加routes.rb和VIEws代码

我的routes.rb文件：

App::Application.routes.draw do      resources :type_as do          resources :type_bs         end      resources :type_bs do         resources :type_as        resources :type_cs        end      resources :type_cs do       resources :type_bs       end      resources :external_databases      root :to => "home#index"    end

浏览次数：

external_databases_form

<%= form_for(@external_database) do |f| %>     <div >      <%= f.label :name %><br/>      <%= f.text_fIEld :name %><br/>     </div>     <div >      <%= f.label :description %><br/>      <%= f.text_fIEld :description %><br/>     </div>     <div >      <%= f.label :url %><br/>      <%= f.text_fIEld :url %><br/>     </div>     <div >       <%= 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 %>

new.HTML.erb

<h1>Creating a new External Database Profile</h1>    <%= render 'form' %>    <%= link_to 'Back',external_database_path %>

show.HTML.erb

<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',:method => :delete %>

解决方法 您的“返回”链接中的new.HTML.erb文件中有拼写错误.它应该是：

external_databases_path

您可以将它与上面show.HTML.erb中您自己的反向链接进行比较.

修复：new.HTML.erb

<h1>Creating a new External Database Profile</h1><%= render 'form' %><%= link_to 'Back',external_databases_path %>

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