<?php


class SomeService
{
    private $entity1Repository;
    private $entity2Repository;

    private $ORMDoctrineFlusher;

    public function __construct(SomeEntity1Repository $entity1Repository, SomeEntity2Repository $entity2Repository, ORMDoctrineFlusher $ormFlusher)
    {
        $this->entity1Repository = $entity1Repository;
        $this->entity2Repository = $entity2Repository;
        $this->ORMDoctrineFlusher = $ormFlusher;
    }

    public function someLogic()
    {
        $entity1 = $this->entity1Repository->findBySome($some1);
        $entity2 = $this->entity2Repository->findBySome($some2);

        // Внутри add делается ->persist()
        $this->entity1Repository->add($entity1);

        // Внутри add делается ->persist()
        $this->entity2Repository->add($entity2);

        $this->ORMDoctrineFlusher->flush();
    }
}