The Secret to Rails OO Design - Literate Programming

Link: The Secret to Rails OO Design - Literate Programming: "Yep, that's right. A Ruby class that inherets from nothing. It's so simple that it hides in plain sight. Loved by those who've mastered Rails, Plain Old Ruby Objects, or "POROs" as some like to call them, are a hidden weapon against complexity. Here's what I mean. Examine this 'simple' model:"