Call to a member function getId() on null in symfony 3 - symfony

Question

I'm trying to retrieve the values ​​of an attribute passed in request, I have tried, I can not, and it returns a NULL, when I make a var_dump on the attribute.
First of all I created a form to enter a comment, and when we click on validate, this page will have to take you back to a page where I have the comment list for each doctor, but I only receive this error which tells me "Call to a member function getId () on null" because I can not recover the value of doctor
Controller of create comments
public function commentCreateAction(Request $request, Booking $bookings)
{
$em = $this->getDoctrine()->getEntityManager();
// $medecin = $booking->getMedecin();
$patient = $bookings->getPatient();
$repoMedecin = $em->getRepository('DoctixMedecinBundle:Medecin');
$medecin = $repoMedecin->findOneBy(array(
'id' => $request->query->get("medecin")
));
$bookings = $em->getRepository("DoctixFrontBundle:Booking")->findBy(array(
"patient" => $patient
));
$comments = new Comment();
$comments->setMedecin($medecin);
$comments->setPatient($patient);
$form = $this->createForm('Doctix\PatientBundle\Form\CommentType', $comments);
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
$em = $this->getDoctrine()->getEntityManager();
$em->persist($comments);
$em->flush();
return $this->render('DoctixPatientBundle:Patient:comments.html.twig', array(
'id' => $comments->getMedecin()->getId(),
'comments' => $comments,
'bookings' => $bookings
));
}
return $this->render('DoctixPatientBundle:Patient:create.html.twig', array(
'comment' => $comment,
'form' => $form->createView()
));
}
Controller from the list of comments
public function commentsAction(Request $request){
$em = $this->getDoctrine()->getManager();
$repoMedecin = $em->getRepository('DoctixMedecinBundle:Medecin');
$medecin = $repoMedecin->findOneBy(array(
'id' => $request->query->get("medecin")
));
$patient = $em->getRepository("DoctixPatientBundle:Patient")->findOneBy(array(
'user' => $this->getUser(),
));
$bookings = $em->getRepository("DoctixFrontBundle:Booking")->findBy(array(
"patient" => $patient
));
***
$comments = $em->getRepository("DoctixPatientBundle:Comment")
->getCommentsForDoc($medecin->getId());
***
return $this->render('DoctixPatientBundle:Patient:comments.html.twig', array(
'comments' => $comments,
'bookings' => $bookings
));
}
My mistake is in this controller.
to have the comments of a doctor, I have a function in my repository
Repository
public function getCommentsForDoc($docId, $approved = true)
{
$qb = $this->createQueryBuilder('c')
->select('c')
->where('c.medecin = :medecin_id')
->addOrderBy('c.created')
->setParameter('medecin_id', $docId);
if (false === is_null($approved))
$qb->andWhere('c.approved = :approved')->setParameter('approved', $approved);
return $qb->getQuery()->getResult();
}
Routing of commentsAction and createcomment
patient_comments:
path: /patient/medecin/comments
defaults: { _controller: DoctixPatientBundle:Patient:comments}
patient_comments_create:
path: /patient/medecin/{id}/create
defaults: { _controller: DoctixPatientBundle:Patient:commentCreate}
View of commentsAction
{% for booking in bookings %}
<div class="list_general" id="liste">
<ul>
<li>
<figure>
<img src="{{ vich_uploader_asset(booking.medecin.media, 'imageFile') }}"
alt="{{ booking.medecin.media.imagename }}">
</figure>
<h4>
Dr. {{ booking.medecin.user.prenom|capitalize }} {{ booking.medecin.user.nom|upper }}
<i class="pending">Pending</i>
</h4>
<a href="{{ path('patient_comments_create', {'id': booking.id}) }}?medecin={{ booking.medecin.id }}">
Ajouter un Commentaire
</a>
<header>
{% for comment in comments %}
{% if comment is defined %}
<label>Nom</label>
<input type="text" class="form-control" readonly
value=" {{ comment.patient.user.nom }} ">
<label>Nom</label>
<input type="text" class="form-control" readonly
value=" {{ comment.patient.user.prenom }} ">
<p> a commenté </p>
<p>
<time datetime="{{ comment.created|date('c') }}">
{{ comment.created|date('l, F j, Y') }}
</time>
</p>
</header>
<label>My Comments</label>
<input type="text" class="form-control" readonly
value=" {{ comment.comment }} ">
{% else %}
<p> Il n'y a pas encore de commentaires à propos de ce médecin. Soyez le premier à commenter....</p>
{% endif %}
{% endfor %}
{% endfor %}
my layout where there is the Feedback tab and where I call my route
<li class="nav-item" data-toggle="tooltip" data-placement="right" title="Mon profil">
<a class="nav-link link-white" href="{{ path('patient_comments')}}">
<i class="fa fa-fw fa-comments"></i>
<span class="nav-link-text">FeedBack</span>
</a>
</li>

Answer 1

Although the question is still lacking the information how exactly you are accessing this route - i.e. why you have made the assumption that the medicin id would be passed in the request params - to me it just looks like your route definition is missing the id:
patient_comments:
path: /patient/medecin/{id}/comments
defaults: { _controller: DoctixPatientBundle:Patient:comments}
and
public function commentsAction(Request $request, $id)
{
$em = $this->getDoctrine()->getManager();
$repoMedecin = $em->getRepository('DoctixMedecinBundle:Medecin');
$medecin = $repoMedecin->find($id);
...