title: How to get all users who are not member of a particular group in Symfony?
body: <p>How to get all users who are not member of a particular group in Symfony?</p>
  
  <p>Users and Groups have a Many To Many relationship.</p>
  
  <p>I would like to get all users who are not member of the Group with group_id 8, what is an appropriate Entity Query for this in Symfony 2 + Doctrine?</p>