Paperclip Rotator

rotator.rb

module Paperclip
  class Rotator < Thumbnail
    def transformation_command
      if rotate_command
        # having the "super" at the end ensures that your thumbnails are allways "inside the limits of your styles"
        # for some reason, super returns: ["-resize", "\"300x300>\""]:Array
        "#{rotate_command} #{super.join(' ')}"
      else
        super
      end
    end
    
    def rotate_command
      target = @attachment.instance
      if target.rotating?
        " -rotate #{target.rotation}"
      end
    end
    
  end
end