Question

我创建了一个表单，允许用户通过两个脚手架代创建一个专辑（一个用于专辑，另一个用于照片本身）。我试图建立一个用户可以看到＆＃34;删除＆＃34;按钮会破坏图片。会有一个小小的警报来确认图片的破坏，然后图片会被破坏，浏览器会在成功通知的情况下重新加载页面。

我的主要问题是我试图访问所选的图片，但我认为Rails会在照片的ID和相册的ID之间混淆。

这是我的代码：

查看/ edit.html.erb

data= json_decode(file_get_contents("php://input"));
$usercomment= mysql_real_escape_string($data->usercomment);
$wardrobe= mysql_real_escape_string($data->wardrobe);
$ctype= mysql_real_escape_string($data->ctype);
$pic= mysql_real_escape_string($data->pic);
$vtype= mysql_real_escape_string($data->vtype);

$query="INSERT INTO db.comment(`comment`,`pic`,`wardrobe`,`comment_type`,`vtype`)
VALUES('".$usercomment."','".$pic."','".$wardrobe."','".$ctype."','".$vtype."')";
$Result1 = mysql_query($query) or die(mysql_error());

album_controller.rb

<h1>Editing Album</h1>

<%= render 'form', album: @album %>

<% @album.photos.each do |p| %>
    <%= image_tag p.image %>
    #Attempt to reach the photo and to destroy it
    <%= link_to 'Destroy', @photo, method: :delete, data: { confirm: 'Are you sure?' } %>
<% end %>

<%= link_to 'Show', @album %> |
<%= link_to 'Back', albums_path %>

photos_controller.rb

class AlbumsController < ApplicationController
  before_action :set_album, only: [:show, :edit, :update, :destroy]

  #...

  def create
    @album = Album.new(album_params)

    if @album.save
      # to handle multiple images upload on create
      if params[:images]
        params[:images].each { |image|
          @album.photos.create(image: image)
        }
      end
      redirect_to @album, notice: 'Your album has been created.'
    else
      render :new, alert: 'Something went wrong.'
    end
  end

  def update
    if @album.update(params[:album].permit(:title,:description))
      # to handle multiple images upload on update when user add more picture
      if params[:images]
        params[:images].each { |image|
          @album.photos.create(image: image)
        }
      end

      redirect_to @album, notice: 'Album has been updated.'
    else
      render :edit
    end
  end

  def destroy
    @album.destroy
    redirect_to albums_url, notice: 'Album was successfully destroyed.'
  end

  private

    def set_album
      #Attempt to select individually the album and the photos
      @album = Album.find(params[:id])
      @photo = Photo.find(params[:id])
    end

    def album_params
      params.require(:album).permit(:title, :description, :user_id, :image)
    end
end

模型/ photo.rb

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

  # trucated for space

  def update
    if @photo.update(photo_params)
      redirect_to @photo, notice: 'Photo was successfully updated.'
    else
      render :edit
    end
  end

  def destroy
    @photo.destroy
    redirect_to :back, notice: 'Photo was successfully destroyed.'
  end

  private
    def set_photo
      @photo = Photo.find(params[:id])
    end

    def photo_params
      params.require(:photo).permit(:album_id, :image)
    end
end

模型/ album.rb

class Photo < ApplicationRecord
  belongs_to :album
  validates_presence_of :album
  mount_uploader :image, ImageUploader

end

当我尝试删除图片时，这是有效的，我无法在我的＆＃34;上传＆＃34;但是，当我尝试重新加载页面时，出现以下错误：class Album < ApplicationRecord has_many :photos accepts_nested_attributes_for :photos, allow_destroy: true end，定位行Couldn't find Photo with 'id'=4

我的问题是：如何在不出现这类错误的情况下以正确的方式定位和删除图片？

提前谢谢

Answer 1

问题是您在params[:id]中使用AlbumController作为相册的ID和照片的ID：

@album = Album.find(params[:id])
@photo = Photo.find(params[:id])

这没有任何意义，你将从中得到无意义的结果。你应该删除第二行（所以只是获取相册），并在你的视图中引用p（来自each循环）而不是@photo：< / p>

<% @album.photos.each do |p| %>
  <%= image_tag p.image %>
  <%= link_to 'Destroy', p, method: :delete, data: { confirm: 'Are you sure?' } %>
<% end %>

嵌套元素的破坏问题

1 个答案: