[Ruby] refactoring/drying help

[shane becker]

> I don't see why you need a full name attribute in the person table  
> when you already have a first name and a last name.

to clear up the existence of first_name, last_name AND full_name. i'm  
pulling from existing data that isn't separated into first and last.  
it's easy enough to grab the first and last word in a multi-word  
name, but what if someone's name is 'brian k vaughn'? i'd lose the  
stuff in the middle. so maybe i should just store the full_name in  
the db, then have first_name and last_name as model methods.