Roxy

Proxies are a powerful tool in software development, allowing you to transparently provide extra functionality or a slight abstraction to an underlying object. One of the more visible uses of proxies is in ActiveRecord which uses a proxy to represent its many associations

http://github.com/qoobaa/sqs/ のソースを読んでいて面白いものを見つけた。ActiveRecordのhas_manyみたいに配列に対してメソッドを定義できちゃうライブラリ。これ便利かも。