paperclip_extend.rake

#
# Paperclip convert id => id_partition
#

require 'ftools' #FileUtils
class PaperclipExtend
  def self.obtain_class
    class_name = ENV['CLASS'] || ENV['class']
    uploads_path = ENV['UPLOADS_PATH'] || ENV['uploads_path']
    raise "Must specify CLASS" unless class_name
    raise "Must specify UPLOADS_PATH" unless uploads_path
    [class_name.tableize, uploads_path]
  end

  def self.convert_id_to_id_partition
     klass, path = obtain_class
     base_dir = [path, klass].join("/")
     dirs = Dir.entries(base_dir)
     dirs.each do |dir|
       id = dir
       if id.to_i == 0
         # example . | .. | 000
         puts "Not a valid directory #{id}"
       else
         id_partition = paperclip_id_partition(id.to_i)
         old_path = [base_dir, id].join("/")
         new_path = [base_dir, id_partition].join("/")
         FileUtils.mkdir_p(new_path)
         FileUtils.mv Dir.glob("#{old_path}/*"), new_path, :verbose => false
         FileUtils.rmdir old_path
         puts "#{old_path.ljust(base_dir.length+5)} => #{new_path}"
       end
     end
  end

  def self.paperclip_id_partition(id)
    ("%09d" % id).scan(/\d{3}/).join("/")
  end
end


namespace :paperclip do
  desc "Convert id => id_partition for given CLASS and UPLOADS_PATH e.g. 'public/uploads'"
  task :id_to_id_partition => :environment do
    PaperclipExtend.convert_id_to_id_partition
  end
end

Just wanted to say that this worked great for me, all I had to do was change require 'ftools' to require 'fileutils' as is hinted in the source code above. The reason for this is because I am using Ruby 1.9. Additionally, I changed line 17 to be simply base_dir=path and when I run it, I just set the full path in that variable. My particular case required a path that looked like photos/data not just photos

Thanks for the excellent work, you sure saved me some time.

Wow.. that was long time ago :-) I'm glad it was of help.

It was very helpful for me also, thanks.

Thanks!