title: autocomplete, search multiple database tables/fields - Symfony
body: <p>I have 3 models:</p>
  
  <p>article [name, title]</p>
  
  <p>photo   [name, description]</p>
  
  <p>video   [name, description, transcription]</p>
  
  <p>Now, I want to create an autocomplete search that  will search each of those models and db fields for matching string in the input field.</p>
  
  <p>Is it possible to do a search over these 3 tables?</p>
  
  <p>If so, how would I go about it?</p>