Symfony 5 How to create a form using parameter converter as value for one of the field

I made a form that works with two tables joined (OneToMany, a strategy can have many strenghts), but I could only make it work with ‘choice_label’ for the ‘strategy’ field, as shown below.

Instead of the ‘choice_label’ which gives the user a list of strategies to choose from by titles, I want my code to retrieve the value of the parameter converter {title} used in my controller functions to identify which strategy is wanted, so that when the form is filled and sent, it automatically sets the strenght to the right strategy.

I looked into the many FormType Field of the documentation, and tried option like ‘data’ instead of ‘choice_label’ but couldn’t make it work. Thank you for your help !

My FormType file :

public function buildForm(FormBuilderInterface $builder, array $options)
        ->add('strategy', EntityType::class,[
            'class' => Strategy::class,
            'choice_label' => 'title'

My Controller file :

 * @Route("fr/strategy/content/{title}", name="frContentStrategy")
public function index(Strategy $strategy): Response
    return $this->render('content_strategy/contentStrategy.html.twig', [
        "strategy" => $strategy

 * @Route("fr/strategy/content/{title}/createforce", name="frCreateForce")
 * @Route("/fr/strategy/content/{title}", name="frUpdateForce", methods="GET|POST")
public function createUpdate(DiagnosticForce $diagnosticforce = null, Request $request, EntityManagerInterface $em)
        $diagnosticforce = new DiagnosticForce();
    $form = $this->createForm(DiagnosticForceType::class, $diagnosticforce);

    if($form->isSubmitted() && $form->isValid()){
        return $this->redirectToRoute("frContentStrategy");

    return $this->render('content_strategy/createForce.html.twig', [
        "diagnosticforce" => $diagnosticforce,
        "form" => $form->createView()

Source: Symfony Questions

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