Question

ControlPanelController又名control_panel_controller.rb是我的主控制器代码，我想在其中处理所有物流。 Picture class aka picture.rb是我使用的模型。

在我的资源中我有

resource :control_panel, only: [:index, :new, :create, :destroy], controller: 'control_panel'

rake路线告诉我

   control_panel POST   /control_panel(.:format)     control_panel#create
new_control_panel GET    /control_panel/new(.:format) control_panel#new
                  DELETE /control_panel(.:format)     control_panel#destroy

这是我的ControllerPanelController

class ControlPanelController < ApplicationController

      def index
        @pictures = Picture.all
      end 

      def new 
        @picture = Picture.new
      end 

      def create
        @picture = Picture.new(picture_params)
        if @picture.save
          redirect_to control_panel_path, notice: "The picture #{@picture.name} has been uploaded."
        else
          render "new"
        end 
      end 

      def destroy
        @picture = Picture.find(params[:id])
        @picture.destroy
        redirect_to control_panel_path, notice:  "The picture #{@picture.name} has been deleted."
      end 

    private
      def picture_params
        params.require(:picture).permit(:name, :attachment)
      end 
    end

在我的app/views/control_panel/new.html.erb我使用url: control_panel_path(@picture)所以我可以发布到ControlPanel创建方法，但它不起作用。我得到了

错误1：

没有路线匹配[GET]“/ control_panel”

<% if !@picture.errors.empty? %>
    <div class="alert alert-error">
      <ul>
        <% @picture.errors.full_messages.each do |msg| %>
          <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <%= form_for @picture, url: control_panel_path(@picture), :html => {:multipart => true} do |f| %>
    <p> 
      <%= f.label :name %><br />
      <%= f.text_field :name %>
    </p>
    <p> 
      <%= f.file_field :image %>
    </p>
    <p> 
      <%= f.label :remote_image_url, "or image URL" %><br />
      <%= f.text_field :remote_image_url %>
    </p>
    <p><%= f.submit %></p>
  <% end %>

错误2： 当我尝试从索引中删除资源时。我得到了

Couldn't find Picture without an ID

Extracted source (around line #22): 

  def destroy
    @picture = Picture.find(params[:id])
    @picture.destroy
    redirect_to control_panel_path, notice:  "The picture #{@picture.name} has been deleted."
  end

第22行就是@picture = Picture.find（params [：id]）

那么修复我的路线的正确方法是什么..我使用的是资源而不是资源，因为它只有一个控制面板，因为它是一个用户而不是多个用户的应用

修改 app / views / control_panel / index.html.erb

的代码

<h1>Control Panel</h1>
<p>Manage all your pictures here</p>

<% if !flash[:notice].blank? %>
  <div class="alert alert-info">
  <%= flash[:notice] %>
  </div>
<% end %>
<br />
<%= link_to "Add Picture", new_control_panel_path, class: "btn btn-primary" %>
<br />
<br />
<table class="table table-bordered table-striped">
  <thead>
    <tr>
      <th>Name</th>
      <th>Picture</th>
      <th>&nbsp;</th>
    </tr>
  </thead>
  <tbody>
    <% @pictures.each do |picture| %>
      <tr>
        <td><%= picture.name %></td>
        <td><%= image_tag picture.image_url(:thumb) %></td>
        <td><%= button_to "Delete", control_panel_path(picture), method: :delete, class: "btn btn-danger", confirm: "Are you sure that you wish to delete #{pi
      </tr>
    <% end %>
  </tbody>
</table>


**EDIT 2:**

通过修复button_to代码来实现删除工作

<td><%= button_to "Delete", control_panel_path(picture.id), method: :delete, class: "btn btn-danger", confirm: "Are you sure that you wish to delete #
      </tr>

Answer 1

错误1

您收到错误是因为您的应用没有与[GET]＆＃34; / control_panel＆＃34;相对应的路线。添加：显示您的control_panel路径并向ControlPanelController显示操作。还要记住，奇异资源没有：index route / action。

http://guides.rubyonrails.org/routing.html#singular-resources

错误2

您收到错误，因为params [：id]为零。 control_panel_path(picture)未设置params[:id]，因为您使用的是control_panel_path而非pictures_path。尝试将id作为GET参数传递：control_panel_path(id: picture.id)。

嵌套资源也是一种很好的方法：http://guides.rubyonrails.org/routing.html#nested-resources

Answer 2

看来你的路线control_panel＃destroy不接受id param 使用＆＃34; resourece s ＆＃34;而不是＆＃34;资源＆＃34;如下。

resources :control_panel, only: [:index, :new, :create, :destroy], controller: 'control_panel'

这会产生这样的路线。

control_panel_index GET      /control_panel(.:format)
                    POST     /control_panel(.:format)
new_control_panel   GET      /control_panel/new(.:format)
control_panel       DELETE   /control_panel/:id(.:format)

如何修复资源发布和删除方法

2 个答案: