Question

作为this早期问题的后续问题，已经解决了

我已经开始使用rails应用程序，我可以在其中创建收藏集。每个收藏集都可以有多个照片。我现在可以创建这些集合和照片。但每当我尝试访问/ collections / 1 / photos时，我的照片索引中的这一行都有问题

undefined method `photo_path' for #<#<Class:0x007fb8c40f1b38>:0x007fb8c88673a0>

<td><%= link_to 'Show', photo %></td>

photos_controller.rb

class PhotosController < ApplicationController
  before_action :set_photo, only: [:show, :edit, :update, :destroy]

  # GET /photos
  # GET /photos.json
  def index
    @photos = Photo.all
  end

  # GET /photos/1
  # GET /photos/1.json
  def show
  end

  # GET /photos/new
  def new
    @photo = Photo.new
  end

  # GET /photos/1/edit
  def edit
  end

  # POST /photos
  # POST /photos.json
  def create
    @photo = Photo.new(photo_params)

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

  # PATCH/PUT /photos/1
  # PATCH/PUT /photos/1.json
  def update
    respond_to do |format|
      if @photo.update(photo_params)
        format.html { redirect_to @photo, notice: 'Photo was successfully updated.' }
        format.json { render :show, status: :ok, location: @photo }
      else
        format.html { render :edit }
        format.json { render json: @photo.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /photos/1
  # DELETE /photos/1.json
  def destroy
    @photo.destroy
    respond_to do |format|
      format.html { redirect_to photos_url, notice: 'Photo was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def photo_params
      params.require(:photo).permit(:name, :collection_id)
    end
end

的routes.rb

Rails.application.routes.draw do
  resources :collections do
    resources :photos
  end
end

/photos/index.html

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

<h1>Photos</h1>

<table>
  <thead>
    <tr>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
    <% @photos.each do |photo| %>
      <tr>
        <td><%= photo.name %></td>
        <td><%= link_to 'Show', photo %></td>
        <td><%= link_to 'Edit', edit_photo_path(photo) %></td>
        <td><%= link_to 'Destroy', photo, method: :delete, data: { confirm: 'Are you sure?' } %></td>
      </tr>
    <% end %>
  </tbody>
</table>

<br>

<%= link_to 'New Photo', new_collection_photo_path %>

collection.rb

class Collection < ApplicationRecord
  has_many :photos
end

photo.rb

class Photo < ApplicationRecord
  belongs_to :collection
end

我使用Rails 5.0.0.1和ruby 2.3.0

Answer 1

使用此显示并删除链接路径错误

<td><%= link_to 'Show', collection_photo_path(@collection, photo) %></td>
<td><%= link_to 'Edit', edit_collection_photo_path(@collection, photo) %></td>
<td><%= link_to 'Destroy', 
collection_photo_path(@collection, photo), method: :delete, data: { confirm: 'Are you sure?' } %></td>

链接应该来自控制器，你应该初始化@collection

def index
  @collction = Collection.find(params[:collection_id])
  @photos = @collction.photos
end

嵌套资源索引页

1 个答案: