/**
  * Action to auto complete a username
  * @return null
  */
 public function autocompleteAction()
 {
     $environment = $this->getEnvironment();
     $term = $environment->getArgument('term');
     if (!$term) {
         return;
     }
     $securityModel = $this->securityManager->getSecurityModel();
     $users = $securityModel->findUsersByUsername($term);
     $view = new JsonView($users);
     $this->response->setView($view);
 }