title: Including "ID" in a model's attribute name
body: <p>I have an attribute that saves the Playstation Network ID for a user in my <code>User</code> model named <code>psn_id</code>. I was wondering if it were best practice to include <code>id</code> in the name considering that appending that particular word is usually reserved for primary and foreign keys. Will it cause any problems somewhere down the line?</p>