delete Redmine duplicated attachments

gistfile1.rb

def del_dup
  for a in Attachment.all
    dup = Attachment.find(:all, :conditions=>{:filename => a.filename, :filesize=>a.filesize})
    if dup.count > 1
  	  puts "Duplicated Attachment found! Start purging..."
  	  puts "item # #{a.id} #{a.filename} (#{a.filesize}) got #{dup.count} duplicated items."
  	  for as in dup[1..-1]
  	    puts "Deleting #{as.id}..."
  	    as.delete_from_disk
  	    as.destroy
  	  end
      break
    end
  end
end