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Наследование: implements Symfony\Bridge\Doctrine\Form\ChoiceList\EntityLoaderInterface
 /**
  * Return the default loader object.
  *
  * @param ObjectManager $manager
  * @param QueryBuilder  $queryBuilder
  * @param string        $class
  *
  * @return ORMQueryBuilderLoader
  */
 public function getLoader(ObjectManager $manager, $queryBuilder, $class, $hints = array())
 {
     $loader = new ORMQueryBuilderLoader($queryBuilder, $manager, $class, $hints);
     foreach ($hints as $name => $value) {
         $loader->setHint($name, $value);
     }
     return $loader;
 }