title: Custom model method that should be included in JSON serialization
body: <p>I'm working with a javascript library where I build comboboxes.
  I have the requirement of build a combobox with <strong>full name</strong> of a person, so I mean name + surname.</p>
  
  <p>Because in database those are 2 separate field (and in my model too), I would like to know if there is a fast way (instead of manually build all hash objects) to "simulate" the presence of an additional field in my model for JSON conversion, because this object must be returned as a JSON array where you can read *full_name* as a key.</p>
  
  <p>Thanks for help</p>