/**
  * @param  string|\Zend\View\Model\ModelInterface $nameOrModel
  * @param  array|null $values
  * @return string
  */
 public function render($nameOrModel, $values = null)
 {
     if (!$nameOrModel instanceof ApiProblemModel) {
         return '';
     }
     $apiProblem = $nameOrModel->getApiProblem();
     if ($this->displayExceptions) {
         $apiProblem->setDetailIncludesStackTrace(true);
     }
     return parent::render($apiProblem->toArray());
 }