title: Where should Rails 3 custom validators be stored?
body: <p>I've seen docs/websites show that custom validators should go in a <code>/lib</code> or <code>/lib/validators</code> directory of a project. I've found (by reading an answer to another post) that they only seem to work in <code>config/initializers</code>. Does anyone know, or have a pointer to official documentation that shows where custom validators should live?</p>