My crop - how to update thumbnails

Hi, I made ruby do the resize based on JS cropper. The image is cropped and can be written to drive, but I dont know how to oryginal image and thumbs.

Here is the code:

  def my_crop(args={})     x1 = args[:x1].to_i     y1 = args[:y1].to_i     new_width = args[:width].to_i     new_height = args[:height].to_i

    with_image do |img|       @data = img.crop(x1, y1, new_width, new_height)     end

    @data.write("c:/resized.jpg") # here I gvet the iamge correctly     # this does not work, how to make @data update thumbs?     attachment_options[:thumbnails].each do |suffix, size|       create_or_update_thumbnail(@data, suffix, *size)     end   end

Its based on blog post from http://blog.onmylist.com, but the oryginal code did not work for me.

Is there a way to update the thumbs?

Cheers, Tomasz Bak