Rails Initializer to add destroyable attachments with Paperclip

paperclip_has_destroyable_file.rb

# encoding: UTF-8
class ActiveRecord::Base

  # Class method to add destroyable paperclip attachments.
  #
  # Example:
  #   has_attached_file :image
  #   has_destroyable_file :image
  #   attr_accessible :image_delete
  #
  # Adds `image_delete`, `image_delete=` methods. Before_save if `image_delete` is
  # set to "1", the `image` attachment gets deleted.
  # 
  # Example html in form:
  #   <%= f.check_box :image_delete %>
  #   <%= f.label :image_delete, 'Delete image' %>
  def self.has_destroyable_file(*attachments)
    attachments.each do |attachment|
      attr_accessor :"#{attachment}_delete"
      before_save do
        self.send(attachment).clear if self.send(:"#{attachment}_delete") == "1"
      end
    end

  end
end