Use a random string as id in Ruby on Rails?

Question

I want to create a web app similar to http://www.pastebin.com/ in Ruby on Rails. pastebin.com uses a random string to identify an item. Ruby on Rails uses an auto-incrementing n

Answer 1

generate a random string as key and put it into a db table? make sure the key is uniq?

base="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
(0...10).map{base[rand(base.length)]}.join