title: How to display collection field in twig template Symfony2
body: <p>My Actual Entities Purchase and PO</p>
  
  <p>Purchase Has fields</p>
  
  <ul>
  <li>Company - Is Seperate Entity in itself</li>
  <li>Product - Is Seperate Entity in itself</li>
  <li>Size - Is Seperate Entity in itself</li>
  <li>Color - Is Seperate Entity in itself</li>
  <li>Cost</li>
  <li>Contact - - Is Seperate Entity in itself</li>
  </ul>
  
  <p>PO [Purchase Order] Has some fields plus a collection field of Purchase. How Do I display fields of Collection Entity -- Purchase.</p>