为队列中即将过期的项构建投票系统的最佳方法是什么?需要后台任务?

I am building an app in Rails 3 (and Ruby 1.9.2) which takes submissions from multiple users. The app closes the submissions window after X amount of time. Then, everyone is to vote (thumbs up/thumbs down) on the submissions. After Y amount of time, the one with the most votes "wins", and the process repeats.I am building an app in Rails 3 (and Ruby 1.9.2