title: Rails Thinking Sphinx:- How to select only some fields in the result and multiple tables select(association)
body: <p>I am a rookie in Thinking Sphinx for Rails.</p>
  
  <p>When Sphinx found a record, it will give all the fields in the table. How can i select only the needed fields?</p>
  
  <p>And in my case, i also need reference to another table. how can i do that?</p>
  
  <p>Thanks</p>