rake to delete attachments created with tests

rake to delete attachments created with tests.rb

namespace :paperclip do
  desc 'deletes stale attachments (i.e., created by tests)'
  task :stale => :environment do
    Dir.chdir('public/system/items')
    dirs = Dir.glob("[^\.]*")
    items = Asset.all.collect(&:id)
    count = 0
    dirs.each { |d|
      unless items.include?(d.to_i)
        print '.'
        system("rm -rf #{d}") 
        count += 1
      end
    }
    puts "#{count} folders deleted (for which no item found in database)."
  end
end