/**
  * @param ApiMetadata $class
  *
  * @return \Doctrine\Common\Persistence\ObjectManagerAware|object
  */
 private function newInstance(ApiMetadata $class)
 {
     $entity = $class->newInstance();
     if ($entity instanceof ObjectManagerAware) {
         $entity->injectObjectManager($this->manager, $class);
     }
     return $entity;
 }