我尝试显示用户根据以下两个功能选择的事件列表：大城市和类别。所以他需要在登陆活动页面之前用搜索表单选择“大城市”和“类别”。
首先，我成功地在标签中显示选定的信息，但当我试图显示事件列表时，我得到了这个错误Variable "category" does not exist.，就像我的小枝或我的控制器“忘记”什么是大城市和类别。
我不明白这有什么问题。

事件控制器.php

<?php

namespace App\Controller\Front;

use App\Form\SearchType;
use App\Repository\EventsRepository;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Component\HttpFoundation\Session\SessionInterface;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;

class EventsController extends AbstractController
{
    #[Route('/search', name: 'search')]
    public function search(
        Request $request, 
        SessionInterface $sessionInterface,
    ){   
        $data = $request->request->all();
        $sessionSearchFormData  = $sessionInterface->get('searchFormData');

        $form = $this->createForm(SearchType::class, ['data' => $sessionSearchFormData]);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {

            $data = $form->getData();
            $sessionInterface->set('searchFormData', $data);
            return $this->redirectToRoute('events', [$data]);
        }
        return $this->renderForm('front/search.html.twig', [ 
            'form' => $form,
        ]);
    }

    #[Route('/events', name: 'events')]
    public function events(
        EventsRepository $eventsRepository, 
    ){
        $events = $eventsRepository->findAll();
        return $this->render("front/events.html.twig", ['events' => $events]);
    }
}

搜索.html.twig

{% extends 'base.html.twig' %}

{% block title %}Liste des sorties et des activités !{% endblock %}

{% block main %}

{{ form_start(form) }}

    <p>Où souhaites-tu faire une sortie ou une activité ?</p>
    {{ form_widget(form.bigcity) }}

    <p>Quel type de sortie ou d’activité t’intéresse ?</p>
    {{ form_widget(form.category) }}

    {{ form_widget(form.save, {'label': 'Je valide') }}

{{ form_end(form) }}

</div>

{% endblock %}

事件.html.twig

{% extends 'base.html.twig' %}

{% block title %}Liste des activités {{ category.title }} à {{ bigcity.name }}{% endblock %}

{% block main %}

<div class="events">

    <h1 class="display-6 pt-3">
        <img src="{{ asset('img/logos/') }}{{ category.image }}" alt="{{ category.title }}" width="auto" height="40">
        à <b class="me-1">{{ bigcity.name }}</b>
    </h1>

    <div class="vr fixed-top start-50"></div>

    <div class="row">

        <div class="col-12 col-md-6">

            <h2 class="text-center my-4">
                <img src="{{ asset('img/titres/zpeak-sorties.svg') }}" alt="Les Zpeak Sorties !">
            </h2>

            <ul class="list-group">

            {% for event in events %}
                    
            {% if event and event.organizer.status == 'organizer' %}

                <a class="list-group-item list-group-item-action">
                    <img src="{{ asset('img/flag_images/' ~ event.spokenlanguage.image) }}" alt="Drapeau {{ event.spokenlanguage.name }}" class="me-2"> {{ event.title }}
                </a>

            {% else %}

                <p>Il n'y a pas de zpeak sortie organisée.</p>

            {% endif %}

            {% endfor %}

            </ul>

        </div>

        <div class="col-12 col-md-6">

            <h2 class="text-center my-4">
                <img src="{{ asset('img/titres/zpeak-idees.svg') }}" alt="Les Zpeak Idées !">
            </h2>

            <ul class="list-group">

            {% for event in events %}
            
            {% if event and event.organizer.status == 'member' %}
                    
                <a class="list-group-item list-group-item-action">
                    <img src="{{ asset('img/flag_images/' ~ event.spokenlanguage.image) }}" alt="Drapeau {{ event.spokenlanguage.name }}" class="me-2"> {{ event.title }}
                </a>

            {% else %}

                <p>Il n'y a pas de zpeak idée proposée.</p>

            {% endif %}

            {% endfor %}

            </ul>
            
        </div>
    
    </div>

</div>

{% endblock %}

搜索类型.php

<?php

namespace App\Form;

use App\Entity\BigCity;
use App\Entity\Categories;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Bridge\Doctrine\Form\Type\EntityType;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;

class SearchType extends AbstractType
{
    private EntityManagerInterface $entityManager;

    public function __construct(EntityManagerInterface $entityManager)
    {
        $this->entityManager = $entityManager;
    }

    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        $bigcity = $options['sessionSearchFormData'] !== null ? $options['sessionSearchFormData']['bigcity'] : '';
        $category = $options['sessionSearchFormData'] !== null ? $options['sessionSearchFormData']['category'] : '';

        $builder
            ->add('bigcity', EntityType::class, [
                'class' => BigCity::class,
                'choice_label' => 'name',
                'placeholder' => 'Sélectionne une grande ville',
                'data'=> $bigcity !== null ? $this->entityManager->getRepository(BigCity::class)->find($bigcity) : '',
            ])
            ->add('category', EntityType::class, [
                'class' => Categories::class,
                'choice_label' => 'image',
                'expanded' => true,
                'multiple' => false,
                'data'=> $category !== null ? $this->entityManager->getRepository(Categories::class)->find($category) : '',
            ])
            ->add('save', SubmitType::class)
        ;
    }

    public function configureOptions(OptionsResolver $resolver): void
    {
        $resolver->setDefaults([
            'data_class' => null,
            'sessionSearchFormData' => null,
        ]);
    }
}