title: Do I really need to require csv gem with Rails?
body: <p>My question is simple:</p>
  
  <p>Do I have to <code>require 'csv'</code> on a class using Ruby on Rails?</p>
  
  <p>If i open a <code>rails console</code> and tryied to use CSV gem it works, but do I have to do that in the file?</p>