Question

所以我使用Active Storage上传附加到Collection模型的多个图像。除非我试图从集合中清除/删除单个附件，否则一切都很顺利。

问题：出于某种原因，每当我加载一个集合的显示页面时，我的所有图像都会立即被清除/删除。当然，每当我点击链接时我只想删除一个文件。有谁知道如何解决这个问题？

我的收藏展示视图：

<div id="gallery">
  <% @collection.images.each do |image| %>
    <%= image_tag(image) %>
    <%= link_to 'Remove image', image.purge %>
  <% end %>
</div>

我已阅读有关http://edgeguides.rubyonrails.org/active_storage_overview.html#removing-files的文档（见第4段）

但遗憾的是，这并未提供有关如何专门使用purge或purge_later方法的任何信息。

修改目前我的代码改为此（遗憾的是，它仍然没有用）：

<div id="gallery">
  <% @collection.images.each do |image| %>
    <%= image_tag(image) %>
    <%= link_to 'Remove', delete_image_attachment_collections_url(image.signed_id),
                method: :delete,
                data: { confirm: 'Are you sure?' } %>
    <% end %>
</div>

在我的collections_controller.rb

中

  def delete_image_attachment
    @image = ActiveStorage::Blob.find_signed(params[:id])
    @image.purge
    redirect_to root_path
  end

在我尝试删除附加图片后，这给了我这个错误：

服务器日志：

Started DELETE "/collections/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBYdz09IiwiZXhwIjpudWxsLCJwdXIiOiJibG9iX2lkIn19--3e75276d414b4c2040e02cf0afbc083e2337faa0/delete_image_attachment" for ::1 at 2018-03-29 19:06:55 +0200
Processing by CollectionsController#delete_image_attachment as HTML
  Parameters: {"authenticity_token"=>"60zIkeknxRYp/sJIWNwF+BrEftYHSCQvak34h8FkadPXgVPQSXN/sCoxI/6FU+jZbqQitES81fyqkmIx6XYp6w==", "id"=>"eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBYdz09IiwiZXhwIjpudWxsLCJwdXIiOiJibG9iX2lkIn19--3e75276d414b4c2040e02cf0afbc083e2337faa0"}
  ActiveStorage::Blob Load (0.1ms)  SELECT  "active_storage_blobs".* FROM "active_storage_blobs" WHERE "active_storage_blobs"."id" = $1 LIMIT $2  [["id", 90], ["LIMIT", 1]]
  ↳ app/controllers/collections_controller.rb:69
  Disk Storage (0.1ms) Deleted file from key: 8wpzqPQcWYjK2rVEejcU88FB
  Disk Storage (0.0ms) Deleted files by key prefix: variants/8wpzqPQcWYjK2rVEejcU88FB/
   (0.0ms)  BEGIN
  ↳ app/controllers/collections_controller.rb:70
  ActiveStorage::Blob Destroy (0.2ms)  DELETE FROM "active_storage_blobs" WHERE "active_storage_blobs"."id" = $1  [["id", 90]]
  ↳ app/controllers/collections_controller.rb:70
   (2.0ms)  COMMIT
  ↳ app/controllers/collections_controller.rb:70
  ActiveStorage::Attachment Load (0.2ms)  SELECT  "active_storage_attachments".* FROM "active_storage_attachments" WHERE "active_storage_attachments"."record_id" = $1 AND "active_storage_attachments"."record_type" = $2 AND "active_storage_attachments"."name" = $3 LIMIT $4  [["record_id", 90], ["record_type", "ActiveStorage::Blob"], ["name", "preview_image"], ["LIMIT", 1]]
  ↳ app/controllers/collections_controller.rb:70
Redirected to http://localhost:3000/
Completed 302 Found in 5ms (ActiveRecord: 2.5ms)

rake routes的输出：

                            Prefix Verb   URI Pattern                                                                              Controller#Action
                              root GET    /                                                                                        home#index
                             about GET    /about(.:format)                                                                         pages#about
                           contact GET    /contact(.:format)                                                                       pages#contact
                          settings GET    /settings(.:format)                                                                  settings#edit
                       new_setting GET    /setting/new(.:format)                                                                   settings#new
                      edit_setting GET    /setting/edit(.:format)                                                                  settings#edit
                           setting GET    /setting(.:format)                                                                       settings#show
                                   PATCH  /setting(.:format)                                                                       settings#update
                                   PUT    /setting(.:format)                                                                       settings#update
                                   DELETE /setting(.:format)                                                                       settings#destroy
                                   POST   /setting(.:format)                                                                       settings#create
delete_image_attachment_collection DELETE /collections/:id/delete_image_attachment(.:format)                                       collections#delete_image_attachment
                       collections GET    /collections(.:format)                                                                   collections#index
                                   POST   /collections(.:format)                                                                   collections#create
                    new_collection GET    /collections/new(.:format)                                                               collections#new
                   edit_collection GET    /collections/:id/edit(.:format)                                                          collections#edit
                        collection GET    /collections/:id(.:format)                                                               collections#show
                                   PATCH  /collections/:id(.:format)                                                               collections#update
                                   PUT    /collections/:id(.:format)                                                               collections#update
                                   DELETE /collections/:id(.:format)                                                               collections#destroy
                rails_service_blob GET    /rails/active_storage/blobs/:signed_id/*filename(.:format)                               active_storage/blobs#show
         rails_blob_representation GET    /rails/active_storage/representations/:signed_blob_id/:variation_key/*filename(.:format) active_storage/representations#show
                rails_disk_service GET    /rails/active_storage/disk/:encoded_key/*filename(.:format)                              active_storage/disk#show
         update_rails_disk_service PUT    /rails/active_storage/disk/:encoded_token(.:format)                                      active_storage/disk#update
              rails_direct_uploads POST   /rails/active_storage/direct_uploads(.:format)                                           active_storage/direct_uploads#create

我的routes.rb：

Rails.application.routes.draw do
  root 'home#index'

  get 'about', to: 'pages#about', as: :about
  get 'contact', to: 'pages#contact', as: :contact
  get 'instellingen', to: 'settings#edit'

  resource :setting
  resources :collections do
    member do
      delete :delete_image_attachment
    end
  end
end

Answer 1

您正在遍历图像集并在每个图像上调用清除方法。相反，您应该链接到控制器上的destroy方法，如下所示，考虑您的控制器操作并猜测您的路径名称。

错误是因为图像对象返回其完整路径，并且链接认为您要指向的内容。相反，您只需要signed_id，并希望该链接调用包含delete_image_attachment路径的路线。

 <%= link_to 'Remove', delete_image_attachment_collections_url(image.signed_id),
                method: :delete,
                data: { confirm: 'Are you sure?' } %>

destroy方法看起来像这样......

def delete_image_attachment
  @image = ActiveStorage::Blob.find_signed(params[:id])
  @image.purge
  redirect_to collections_url
end

路线应该是这样的......

resources :collections do
  member do
    delete :delete_image_attachment
  end
end

查看rails routing guide以获取更多有趣的路由事实。

Answer 2

感谢您关于Blob vs Attachment的更新！清除附件后，我将redirect_back改为我来自的形式：

def remove_attachment
  attachment = ActiveStorage::Attachment.find(params[:id])
  attachment.purge # or use purge_later
  redirect_back(fallback_location: collections_path)
end

不是重新加载整个页面的最佳解决方案，但有效...

Answer 3

好吧，我某种解决了我的问题，但我并不真正理解发生了什么。

每当我点击＆＃34;删除＆＃34;按钮我收到此错误：

它想要重定向到ID为43的collection_url（而我的集合的ID实际上是6,43可能是图像附件的ID）。

当我手动重新加载相同的收藏页面时，图片消失了（所以它有点工作）但是没有什么是理想的。

有人知道如何改进我的代码，以便我的控制器中的redirect_to指向当前的集合ID而不是Activestorage图像附件ID吗？

我的文件

查看：collection / show.html.erb：

<div id="gallery">
  <% @collection.images.each do |image| %>
    <%= image_tag(image) %>
    <%= link_to 'Remove', delete_image_attachment_collection_url(image),
                    method: :delete,
                    data: { confirm: 'Are you sure?' } %>
  <% end %>
</div>

控制器：collections_controller.rb

class CollectionsController < ApplicationController
  before_action :set_collection, only: [:show, :edit, :update, :destroy]
  before_action :set_collections

  # GET /collections
  # GET /collections.json
  def index
  end

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

  # GET /collections/new
  def new
    @collection = Collection.new
  end

  # GET /collections/1/edit
  def edit
  end

  # POST /collections
  # POST /collections.json
  def create
    @collection = Collection.new(collection_params)

    respond_to do |format|
      if @collection.save
        format.html { redirect_to @collection, notice: 'Fotocollectie is aangemaakt.' }
        format.json { render :show, status: :created, location: @collection }
      else
        format.html { render :new }
        format.json { render json: @collection.errors, status: :unprocessable_entity }
      end
    end

    # collection = Collection.create!(collection_params)
    # redirect_to collection
  end

  # PATCH/PUT /collections/1
  # PATCH/PUT /collections/1.json
  def update
    respond_to do |format|
      if @collection.update(collection_params)
        format.html { redirect_to @collection, notice: 'Fotocollectie is bijgewerkt.' }
        format.json { render :show, status: :ok, location: @collection }
      else
        format.html { render :edit }
        format.json { render json: @collection.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /collections/1
  # DELETE /collections/1.json
  def destroy
    @collection.destroy
    respond_to do |format|
      format.html { redirect_to collections_url, notice: 'Fotocollectie is verwijderd.' }
      format.json { head :no_content }
    end
  end

  def delete_image_attachment
    @image = ActiveStorage::Attachment.find(params[:id])
    @image.purge
    redirect_to @current_page
  end

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

    def set_collections
      @collections = Collection.all
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def collection_params
      params.require(:collection).permit(:title, :order, images: [])
    end
end

型号：collection.rb

class Collection < ApplicationRecord
  has_many_attached :images
end

路线：routes.rb

Rails.application.routes.draw do
  root 'home#index'

  get 'about', to: 'pages#about', as: :about
  get 'contact', to: 'pages#contact', as: :contact
  get 'settings', to: 'settings#edit'

  resource :setting

  resources :collections do
    member do
      delete :delete_image_attachment
    end
  end
end

Answer 4

以下对我不起作用。

def delete_image_attachment
  @image = ActiveStorage::Blob.find_signed(params[:id])
  @image.purge
  redirect_to collections_url
end

所以我所做的就是找到附件并将其清除。您可以执行 purge_later 。

def delete_image_attachment
  @image = ActiveStorage::Blob.find_signed(params[:id])
  @image.attachments.first.purge
  redirect_to collections_url
end

这会删除附件和Blob记录。

Answer 5

如果您来到这里寻找一种通过 rails 控制台删除附件的方法：

user.image.purge

来源：https://edgeguides.rubyonrails.org/active_storage_overview.html#removing-files

Rails 5.2 Active Storage清除/删除附件

5 个答案:

我的文件