Example Usage of ObjectManagerAware inside entity - symfony

Question

I would like to use entity manager inside entity and no idea for usage.
use Doctrine\Common\Persistence\ObjectManagerAware;
use Doctrine\Common\Persistence\ObjectManager;
use Doctrine\Common\Persistence\Mapping\ClassMetadata;
use SomeBundle\Entity\Boarding;
use SomeBundle\Entity\User;
class Entity extends ApiUserEntity implements ObjectManagerAware
{
private $em;
public function ___construct(User $user)
{
$this->board = $this->getData(123);
}
public function injectObjectManager(ObjectManager $objectManager, ClassMetadata $classMetadata)
{
$this->em = $objectManager;
}
private function getData($leadId)
{
//return gettype($this->em); //return null
$repository =$this->em->getRepository(Boarding::class);
$query = $repository->createQueryBuilder('b')
->where('b.lead = :lead')
->setParameter('lead', $leadId)
->getQuery();
$boards = $query->getResult();
return $boards;
}
}
Using this code get me error
Call to a member function getRepository() on null"
The entity manager is null also
//return gettype($this->em); //return null
Any idea for example usage?

Answer 1

You can try to create a repository like here. Just add
* #ORM\Entity(repositoryClass="App\Repository\EntityRepository")
or to YAML, Xml depends on your configuration and then create the repository file. Like this one:
// src/AppBundle/Repository/ProductRepository.php
namespace AppBundle\Repository;
use Doctrine\ORM\EntityRepository;
class ProductRepository extends EntityRepository
{
public function findAllOrderedByName()
{
return $this->getEntityManager()
->createQuery(
'SELECT p FROM AppBundle:Product p ORDER BY p.name ASC'
)
->getResult();
}
}