未定义的方法`images_path＆＃39; （Carrierwave +嵌套资源）

Question

我正在尝试使用Railscast的Carrierwave教程作为起点，使我的Image模型成为我的List模型的子项。我更改了路线但是当我尝试上传图片时，转到此URL localhost：300 / listings / 1 / images / new我收到此错误：未定义方法`images_path'用于＃＆lt;＃：0x00000109abfd88＆gt; < /强>

有任何帮助吗？感谢。

image_controller.rb

class ImagesController < ApplicationController
   before_action :set_image, only: [:show, :edit, :update, :destroy]

   def index
      # I changed this so the images would appear on localhost:300/listings/3/images
      # Don't know if it's the best way to accomplish that
      @images = Listing.find(params[:listing_id]).images
   end

   def new
      @image = Image.new(:listing_id => params[:listing_id])
   end

   def edit
   end

   def create
      @image = Image.new(image_params)

      respond_to do |format|
         if @image.save
            format.html { redirect_to :back, notice: 'Image was successfully created.' }
            format.json { render action: 'show', status: :created, location: @image }
         else
            format.html { render action: 'new' }
            format.json { render json: @image.errors, status: :unprocessable_entity }
         end
      end
   end

   def update
      respond_to do |format|
         if @image.update(image_params)
            format.html { redirect_to @image, notice: 'Image was successfully updated.' }
            format.json { head :no_content }
         else
            format.html { render action: 'edit' }
            format.json { render json: @image.errors, status: :unprocessable_entity }
         end
      end
   end

   def destroy
      @image.destroy
      respond_to do |format|
         format.html { redirect_to :back }
         format.json { head :no_content }
      end
   end

   private
      # Use callbacks to share common setup or constraints between actions.
      def set_image
         @image = Image.find(params[:id])
      end

      # Never trust parameters from the scary internet, only allow the white list through.
      def image_params
         params.require(:image).permit(:file, :listing_id)
      end
end

images.rb表格

<%= form_for [@listing, @image], :html => { :multipart => true } do |f| %>
   <% if @image.errors.any? %>
      <div id="error_explanation">
         <h2><%= pluralize(@image.errors.count, "error") %> prohibited this image from being saved:</h2>

         <ul>
         <% @image.errors.full_messages.each do |msg| %>
            <li><%= msg %></li>
         <% end %>
         </ul>
      </div>
   <% end %>

   <%= f.hidden_field :listing_id %>

   <div>
      <%= f.label :file, 'Upload Images' %>
      <%= f.file_field :file %>
   </div>

   <div>
      <%= f.submit %>
   </div>
<% end %>

Answer 1

您尚未在控制器中初始化@listing对象，但在视图中使用它。

进行此更改

def new
  @listing = Listing.find params[:listing_id]
  @image = Image.new(:listing_id => params[:listing_id])
end