title: how to create an ajax-driven auto-complete field in a sonata admin form in symfony?
body: <p>I have a form generated with the sonata admin bundle. I want to enable a live search tip for my user on an input field. The proposition should come from a category table in the DB.</p>
  
  <p>For example,  if I have a field called company, when a user writes "a", I should suggest all companies whose name contains "a".</p>