Question

当模型被销毁时，使用Paperclip（v4.2.0）保存的附件不会从磁盘中删除，是否有其他人遇到此问题？一切都按预期工作，但文件不会从磁盘中删除。任何帮助或想法都将受到超级赞赏！

型号：

class Attachment < ActiveRecord::Base
  belongs_to :article

  has_attached_file :file, { :preserve_files => "false" }
  do_not_validate_attachment_file_type :file
end

class Article < ActiveRecord::Base
  belongs_to :topic
  belongs_to :subtopic
  belongs_to :author
  has_many :attachments, :dependent => :destroy
  accepts_nested_attributes_for :attachments, allow_destroy: true, reject_if: lambda { |a| a[:file].blank? }

  validates :topic_id, presence: true
  validates :title, presence: true, length: { maximum: 16 }
  validates :subtitle, length: { maximum: 20 }
  validates :content, presence: true
end

销毁文章控制器中的操作：

def destroy
  @article = Article.find(params[:id])
  begin
    # first delete the attachments from disk
    @article.attachments.each do |a|
      a.file.destroy
    end
    @article.destroy
  rescue
    flash[:danger] = "Unable to delete article"
  else
    flash[:success] = "Article deleted"
  end
  redirect_to admin_articles_url
end

Answer 1

您需要设置附件＆＃39;文件＆＃39;在销毁之前将属性设置为nil，以便从磁盘中删除上传的文件。

所以你的代码应该是这样的

销毁文章控制器中的操作：

def destroy
  @article = Article.find(params[:id])
  begin
    # first delete the attachments from disk
    @article.attachments.each do |a|
     a.file = nil
     a.save
    end
    @article.destroy
  rescue
    flash[:danger] = "Unable to delete article"
  else
    flash[:success] = "Article deleted"
  end
  redirect_to admin_articles_url
 end

Answer 2

尝试将preserve_files选项添加到“false”字符串

has_attached_file :file, :preserve_files => "false"

Answer 3

想出来：

  def destroy
    self.transaction do
      self.images.destroy_all
      super
    end
  end

self.images是带附件的记录集合。最重要的是self.transaction do ...，因为当出于任何原因super（原始destroy）失败时，它不会从hdd中删除文件。它一直等到COMMIT

Answer 4

尝试这样的事情：

def destroy
    @article = Article.find(params[:id])
    @article.attachments.destroy
    @article.destroy
  respond_to do |format|
      format.html { redirect_to admin_articles_url }
    end
end

@article = Article.find(params[:id])会找到您要删除的文章。 @article.attachments将收集与该特定文章相关的所有附件

注意：所有附件销毁后必须销毁@article。如果您在@article.destroy之前写下@article.attachments.destroy，则会在未找到@article的情况下发出错误。

正如您在Article模型has_many :attachments, :dependent => :destroy中提到的那样那么我认为不需要写@article.attachments.destroy来销毁@article它会删除与之相关的所有附件。

Answer 5

您还可以使用 before_destroy 回调

例如

class User < ActiveRecord::Base
 before_destroy :delete_image

 has_attached_file :image,
              path: "/attachments/:class/:attachment/:style/:filename"

 validates_attachment_content_type :image, content_type: \Aimage\/.*\z/

 private

 def delete_image
   self.image = nil
   self.save
 end
end

然后，只要销毁模型类的实例，就会首先删除附件。

回形针附件在销毁时不会被删除

5 个答案: