Why is the object not being deleted?

Question

symfony

I'm trying to delete a record from the database, but I've run into a problem.
They make it clear to me that there is no "remove" method

Undefined method 'remove'. The method name must start with either findBy or findOneBy!

And actually the question is how to remove it?

class VoteHandler implements VoteHandlerInterface{
    private $om;
    private $entityClass;
    private $repository;
    private $formFactory;

    public function __construct(ObjectManager $om, $entityClass, FormFactoryInterface $formFactory){
        $this->om = $om;
        $this->entityClass = $entityClass;
        $this->repository = $this->om->getRepository($this->entityClass);
        $this->formFactory = $formFactory;
    }
public function delete($id){
        $vote = $this->repository->findOneById($id);
        $this->repository->remove($vote);
        $this->repository->flush();
        return true;
    }
}

Or is it all about the ObjectManager?
And by the way, I will be grateful if you explain what is the difference with EntityManager

Answer 1

$this-> repository ->remove($vote);
$this-> repository ->flush();
Well, implement these methods in the repository, if you don't want to delete the manager...
upd: ObjectManager is an interface, and EntityManager implements this interface.