问图片裁剪亚马逊S3 (离线工作)

EN

def update_attributes(att)
  scaled_img = Magick::ImageList.new(self.photo.to_file)
  orig_img = Magick::ImageList.new(self.photo.to_file(:original))
  scale = orig_img.columns.to_f / scaled_img.columns

  args = [ att[:x1], att[:y1], att[:width], att[:height] ]
  args = args.collect { |a| a.to_i * scale }

  orig_img.crop!(*args)
  orig_img.write(self.photo.to_file(:original))

  self.photo.reprocess!
  self.save

  super(att)
end

undefined method `columns' for Magick::ImageList