Upload images in background. This is a draft

paperclip_background_upload.rb

# has_attached_file :image, configuration
# background_upload_for :image
module PaperclipBackgroundUpload
  extend ActiveSupport::Concern
  
  included do
    def background
      @background || false
    end  

    def upload_stopped
      @upload_stopped || false
    end 
    
    def stop_foreground_upload
      self.upload_stopped = true
      false unless background
    end

    def request_upload
      if upload_stopped
        Resque.enqueue(
          ImageUploadWorker, 
          self.class.paperclip_background_model, 
          self.class.paperclip_background_field, 
          self.id
        )
        self.upload_stopped = false  
      end
    end
  end

  module ClassMethods
    def background_upload_for(field)
      self.paperclip_background_model = self.to_s.split("::").first
      self.paperclip_background_field = field

      after_commit :request_upload
      attr_accessor :background, :upload_stopped  

      public_send "before_#{field}_post_process", :stop_foreground_upload # Paperclip callback
    end

    attr_accessor :paperclip_background_model, :paperclip_background_field
  end   

end