关联模型中存储的载波文件路径

Question

我的结构

class Project 
  include Mongoid::Document

  has_many :documents MyUploader

  def directory
    ...
  end

class Document
  include Mongoid::Document

  belongs_to :project
  mount_uploader :physical_doc

  def directory
    folder = File.join(self.project.directory, self.class::SUBFOLDER)
    Dir.mkdir(folder) unless File.exists?(folder)
    folder
  end

class MyUploader < CarrierWave::Uploader::Base
 def store_dir
    nil
  end

  def cache_dir
    self.model.directory
  end

我文档的存储目录只有项目知道（位置可能会改变，Project class 负责移动文档以防万一）

问题

删除文档时，Rails 将按照它们在代码中出现的顺序删除 "fields"。也就是说

它会先删除:project关联
然后它将删除 mount_uploader :physical_doc
... 但是载波 mount_uploader 需要知道文件的存储位置才能删除文件！哦哦....

换句话说，这两段代码是不等价的

class Document
      mount_uploader :physical_doc
      belongs_to :project
      # This allows the document to be deleted, not created

class Document
      belongs_to :project
      mount_uploader :physical_doc
      # This allows the document to be created, not deleted

解决方案？

Answer 1

添加我的评论作为答案（我可以使用一些积分）。

也许在使用您发布的第二个代码段时使用 before_destroy 回调来实际删除文件？

before_destroy { attachment.file.destroy if attachment.file.exists? }

关联模型中存储的载波文件路径

Carrierwave file path stored in associated model

ruby-on-rails

mongoid

carrierwave