Автоматически устанавливать значение отношения один-к-одному в контроллере symfony3

Немного справочной информации. У меня есть две сущности, которые имеют двунаправленную связь: по сути, в форме заявки может быть только одна форма рекомендации. Когда рекомендатель заполняет форму, я хотел бы, чтобы это происходило автоматически, и я хотел бы выбрать только соответствующую форму приложения (защитить данные других пользователей) на основе определенного кода, который они вводят на созданной мною настраиваемой странице формы. Я не уверен, как это произошло, но однажды я заставил его работать, но по неизвестной причине он остановился и добавляет «NULL» для идентификатора формы кандидата в форму рекомендации в моей базе данных. Я включу всю информацию, которую могу:

РекомендацияФорма Entity:

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * RecommendationForm
 *
 * @ORM\Table(name = "recommendation_form")
 * @ORM\Entity(repositoryClass = "AppBundle\Repository\RecommendationFormRepository")
 */
class RecommendationForm
{
    /**
     * @var int
     *
     * @ORM\Column(name = "id", type = "integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy = "AUTO")
     */
    private $id;

    /**
     * One RecommendationForm has One ApplicantForm.
     * @ORM\OneToOne(targetEntity = "ApplicantForm", inversedBy = "recommendation_form")
     * @ORM\JoinColumn(name = "applicant_form_id", referencedColumnName = "id")
     */
    private $applicant_form;

    //....

    public function __construct($applicant_form) {
        date_default_timezone_set('America/New_York');

        $this->applicant_form = $applicant_form;

        $this->submitDate = new \DateTime("now");
    }


    /**
     * Get id
     *
     * @return integer
     */
    public function getId()
    {
        return $this->id;
    }


    // /**
    //  * Set applicantForm
    //  *
    //  * @param integer $applicant_form
    //  *
    //  * @return RecommendationForm
    //  */
    // public function setApplicantForm($applicant_form)
    // {
    //     $this->applicant_form = $applicant_form;

    //     return $this;
    // }

    /**
     * Get applicantForm
     *
     * @return integer
     */
    public function getApplicantForm()
    {
        return $this->applicant_form;
    }

//....
}

ApplicantForm Entity:

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use chriskacerguis\Randomstring\Randomstring;

/**
 * ApplicantForm
 *
 * @ORM\Table(name = "applicant_form")
 * @ORM\Entity(repositoryClass = "AppBundle\Repository\ApplicantFormRepository")
 */
class ApplicantForm
{
    /**
     * @var int
     *
     * @ORM\Column(name = "id", type = "integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy = "AUTO")
     */
    private $id;

    /**
     * One ApplicantForm has One RecommendationForm.
     * @ORM\OneToOne(targetEntity = "RecommendationForm", mappedBy = "applicant_form")
     */
    private $recommendation_form;

    /**
     * @var string
     *
     * @ORM\Column(name = "accessCode", type = "string", length=75, unique=true)
     */
    private $accessCode;

    //....

    public function __construct() {

        $random = new \chriskacerguis\Randomstring\Randomstring();

        $this->accessCode = $random->generate(15, true);
    }

//...
}

Рекомендация Контроллер:

namespace AppBundle\Controller;

use AppBundle\Entity\RecommendationForm;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Method;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Form\Extension\Core\Type\EmailType;
use Symfony\Component\Form\Extension\Core\Type\PasswordType;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;

/**
 * Recommendationform controller.
 *
 * @Route("recommendationform")
 */
class RecommendationFormController extends Controller
{
    private $accessCode;
    private $applicantForm;
    private $applicantFormID;
    /**
     * Lists all RecommendationForm entities.
     *
     * @Route("/", name = "recommendationform_index")
     * @Method({"GET", "POST"})
     */
    public function indexAction(Request $request)
    {
        $em = $this->getDoctrine()->getManager();

        $data = array();
        $form = $this->createFormBuilder($data)
            ->add('email', EmailType::class)
            ->add('accessCodeSS', PasswordType::class)
            ->add('submit', SubmitType::class)
            ->getForm();

        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            $accessCode = $form["accessCodeSS"]->getData();

            return $this->redirectToRoute('recommendationform_new');
        }

        return $this->render('recommendationform/index.html.twig', array(
                'form' => $form->createView(),
        ));
    }

    /**
     * Creates a new RecommendationForm entity.
     *
     * @Route("/new", name = "recommendationform_new")
     * @Method({"GET", "POST"})
     */
    public function newAction(Request $request)
    {
        if (isset($_POST["accessCodeSS"])){

            $this->accessCode = $_POST["accessCodeSS"];

            $accessCode = $this->accessCode;
            $em = $this->getDoctrine()->getManager();

            $query = $em->createQuery('SELECT u FROM AppBundle:ApplicantForm u WHERE u.accessCode = :accessCode')
                ->setParameter('accessCode', $accessCode);
            $applicantFormID = $query->getResult();

            $this->applicantForm = $applicantFormID[0];

        }

        var_dump($this->applicantForm);

        $RecommendationForm = new Recommendationform($this->applicantForm);

        $form = $this->createForm('AppBundle\Form\RecommendationFormType', $RecommendationForm);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            $em = $this->getDoctrine()->getManager();
            $em->persist($RecommendationForm);
            $em->flush();

            return $this->redirectToRoute('recommendationform_show', array('id' => $RecommendationForm->getId()));
        }

            return $this->render('recommendationform/new.html.twig', array(
                'RecommendationForm' => $RecommendationForm,
                'form' => $form->createView(),
            ));
    }

    /**
     * Finds and displays a RecommendationForm entity.
     *
     * @Route("/{id}", name = "recommendationform_show")
     * @Method("GET")
     */
    public function showAction(RecommendationForm $RecommendationForm)
    {
        $deleteForm = $this->createDeleteForm($RecommendationForm);

        return $this->render('recommendationform/show.html.twig', array(
            'RecommendationForm' => $RecommendationForm,
            'delete_form' => $deleteForm->createView(),
        ));
    }

    /**
     * Displays a form to edit an existing RecommendationForm entity.
     *
     * @Route("/{id}/edit", name = "recommendationform_edit")
     * @Method({"GET", "POST"})
     */
    public function editAction(Request $request, RecommendationForm $RecommendationForm)
    {
        $deleteForm = $this->createDeleteForm($RecommendationForm);
        $editForm = $this->createForm('AppBundle\Form\RecommendationFormType', $RecommendationForm);
        $editForm->handleRequest($request);

        if ($editForm->isSubmitted() && $editForm->isValid()) {
            $this->getDoctrine()->getManager()->flush();

            return $this->redirectToRoute('recommendationform_edit', array('id' => $RecommendationForm->getId()));
        }

        return $this->render('recommendationform/edit.html.twig', array(
            'RecommendationForm' => $RecommendationForm,
            'edit_form' => $editForm->createView(),
            'delete_form' => $deleteForm->createView(),
        ));
    }

    /**
     * Deletes a RecommendationForm entity.
     *
     * @Route("/{id}", name = "recommendationform_delete")
     * @Method("DELETE")
     */
    public function deleteAction(Request $request, RecommendationForm $RecommendationForm)
    {
        $form = $this->createDeleteForm($RecommendationForm);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            $em = $this->getDoctrine()->getManager();
            $em->remove($RecommendationForm);
            $em->flush();
        }

        return $this->redirectToRoute('recommendationform_index');
    }

    /**
     * Creates a form to delete a RecommendationForm entity.
     *
     * @param RecommendationForm $RecommendationForm The RecommendationForm entity
     *
     * @return \Symfony\Component\Form\Form The form
     */
    private function createDeleteForm(RecommendationForm $RecommendationForm)
    {
        return $this->createFormBuilder()
            ->setAction($this->generateUrl('recommendationform_delete', array('id' => $RecommendationForm->getId())))
            ->setMethod('DELETE')
            ->getForm()
        ;
    }
}

Я рыскал по всему Интернету и просто не могу найти ответа или понять, как это перестало работать.