必須管理傳遞給選擇欄位的型別的物體。也許您忘記將其保留在物體管理器中？

我制作了一個搜索表單，其中存在多個物體。我想保留最后輸入的值，以便當用戶回傳表單時，他會檢索他的最后選擇。

通過嘗試這樣做，我發現自己出現以下錯誤：

Entity of type "App\Entity\BigCity" passed to the choice field must be managed. Maybe you forget to persist it in the entity manager?

當我看到這個錯誤時，我添加了以下行：$entityManagerInterface->persist($data); 但我用另一個錯誤找回自己：

EntityManager#persist() expects parameter 1 to be an entity object, array given.

我應該怎么做才能避免這些錯誤？

事件控制器.php

<?php

namespace App\Controller;

use App\Form\SearchType;
use App\Repository\EventsRepository;
use App\Repository\CategoriesRepository;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Component\HttpFoundation\RequestStack;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;

class EventsController extends AbstractController
{   
    private $requestStack;

    public function __construct(RequestStack $requestStack)
    {
        $this->requestStack = $requestStack;
    }

    #[Route('/search', name: 'search')]
    public function search(Request $request, EntityManagerInterface $entityManagerInterface,)
    {   
        $data = $request->query->all();
        $sessionFormData  = $sessionInterface->get('data');

        $form = $this->createForm(SearchType::class, $sessionFormData);
        $form->handleRequest($request);
        
        if ($form->isSubmitted() && $form->isValid()) {
            $data = $form->getData();
            $session->set('data', $data);
            return $this->render('front/events.html.twig', $data);
        }

        return $this->renderForm('front/search.html.twig', [
            'form' => $form
        ]);
    }

搜索型別.php

<?php

namespace App\Form;

use App\Entity\BigCity;
use App\Entity\Categories;
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
{
    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        $builder
            ->add('bigcity', EntityType::class, [
                'class' => BigCity::class,
                'choice_label' => 'name',
                'placeholder' => 'Sélectionne une grande ville'
            ])
            ->add('category', EntityType::class, [
                'class' => Categories::class,
                'choice_label' => 'image',
                'expanded' => true,
                'multiple' => false,
            ])
            ->add('save', SubmitType::class)
        ;
    }

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

uj5u.com熱心網友回復：

如果要在會話中保存值，可以使用 SessionInterface，然后在 createForm 方法的選項中傳遞會話值

use Symfony\Component\HttpFoundation\Session\SessionInterface;

public function someAction(Request $request, SessionInterface $session)
{
   $data = $request->request->all();

   $sessionSearchFormData  = $session->get('searchFormData'); // null at the first time

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

    if($form->isSubmitted())
    {
        // put values of form in session just after each time the form is submitted
        $session->set('searchFormData', $data);
    }

}

use Doctrine\ORM\EntityManagerInterface;

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'] : '';

    $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,
        ])
        ->add('save', SubmitType::class)
    ;
}

public function configureOptions(OptionsResolver $resolver): void
{
    $resolver->setDefaults([
        'data_class' => null,
         'sessionSearchFormData' => null, // don't forget this
    ]);
}

編輯：

這是另一種解決方案，您無需在 formType 中執行任何操作，也無需將任何值作為選項傳遞，只需洗掉 $form->handleRequest 并添加 $form->submit()

在樹枝上

<form action="{{ path('events_index' }}" method="get">

控制器

public function search(Request $request, SessionInterface $session)
{
    
    $sessionSearchFormData = $session->get('searchFormData');

    // perhaps you should test if $sessionSearchFormData is null or not
    $form = $this->createForm(SearchType::class);
    $form->submit($sessionSearchFormData);

    return $this->renderForm('front/search.html.twig', [
        'form' => $form
    ]);
}


public function events(Request $request, SessionInterface $session)
{

    $data = $request->query->all(); // if GET method
    
    // if the user comes from search page, so we set the session searchFormData with submitted data
    if(some logic to check if previous page is search form) {
        $session->set('searchFormData', $data);
    }
    
    $events = your query to filter events using $data

   
    return $this->renderForm('front/events.html.twig', [
        'events' => $events
    ]);
}

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