title: Rails 3 ActiveRecord API: .build method
body: <p>I am fairly new to Ruby/RoR (outside of a year) and I have noticed that there are several different methods inside of RoR or Ruby that basically do the same thing. The one method I am wanting to get some sort of clarification on, is the <code>.build</code> method. when it is effective to use or how to use it in its best light, sorta thing.</p>
  
  <p>Thanks!</p>