Symfony 3 - can't use custom Repository - symfony

Question

I try to create default repository in my Symfony 3. First I created Repository class with method 'findByParentOrderedByName'. In next step I added in Entity line:
* #ORM\Entity(repositoryClass="AppBundle\Repository\ChildRepository")
Unfortunelly when I try to run findByParentOrderedByName() I get error
Undefined method 'findAllOrderedByName'. The method name must start with either findBy, findOneBy or countBy!
What I make incorrect?
Repository code:
<?php
namespace AppBundle\Entity;
/**
* Child
* #ORM\Entity(repositoryClass="AppBundle\Repository\ChildRepository")
*/
class Child
{
........
}

Answer 1

To use custom repository class properly, firstly repository class name must be defined in entity class.
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity(repositoryClass="AppBundle\Repository\ChildRepository")
*/
class Child
{
}
Then repository class created as like this:
namespace AppBundle\Repository;
use Doctrine\ORM\EntityRepository;
class ChildRepository extends EntityRepository
{
/**
* #return Child[]
*/
public function findAllOrderedByName()
{
return $this->getEntityManager()
->createQuery('SELECT * c FROM AppBundle:Child c ORDERED BY c.name ASC')
->getResult();
}
}