undefined

asset.rb

class Asset < ActiveRecord::Base
   has_attached_file :local, 
                   :styles => { :thumb => "100x100>" }

  has_attached_file :remote, :styles => { :thumbnail => "100x100>" },
    :storage => :s3, :s3_credentials =>  RAILS_ROOT + "/config/s3.yml",
    :bucket => "make-up-your-own-test-bucket", :path => ":class/:attachment/:id/:style.:extension"

  validates_attachment_size :local, :in => 1.byte..10.megabyte
  validates_attachment_presence :local

  # for the views
  def good_image
    remote_file_name ? remote : local
  end

  def archive_to_remote
    if local_file_name
      self.remote = local.to_file
      self.save
    end
  end
end

#source: http://pastie.org/187484
#explanation: http://groups.google.com/group/paperclip-plugin/browse_thread/thread/8af52cc25cd97d02/05221d1a7254601d?lnk=gst&q=background