cloning an already uploaded image using attachment_fu

class Image < ActiveRecord::Base

  #you attachment fu config

  def clone
    cloned = super
    cloned.filename = "#{rand(1000)}_#{self.filename}"
    cloned.temp_data = File.read( self.full_filename )
    cloned
  end

end

#code

cloned_image = some_image.clone
cloned_image.save! #saving the image will also create the thumbnails