Symfony：必须管理传递给选择字段的“App\Entity\Classement”类型的实体。也许您忘记将其保留在实体管理器中？答案

【问题标题】：Symfony : Entity of type "App\Entity\Classement" passed to the choice field must be managed. Maybe you forget to persist it in the entity manager?Symfony：必须管理传递给选择字段的“App\Entity\Classement”类型的实体。也许您忘记将其保留在实体管理器中？
【发布时间】：2021-08-14 22:35:32
【问题描述】：

我有这个表格：

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        ->add('country', EntityType::class, [
            'class' => Country::class,
            'choice_label' => 'name',
            'label' => false,
            'placeholder' => '-',
            'query_builder' => function (EntityRepository $er) {
                return $er->createQueryBuilder('c')
                          ->orderBy('c.name', 'ASC');
            }
        ])
        ->add('season', EntityType::class, [
            'class' => Season::class,
            'choice_label' => 'year',
            'label' => false,
            'placeholder' => '-',
            'query_builder' => function (EntityRepository $er) {
                return $er->createQueryBuilder('s')
                    ->orderBy('s.year', 'ASC');
            }
        ])
        ->add('clubHistos', CollectionType::class, [
            'entry_type' => ClubHistoType::class,
            'entry_options' => [
                'label' => false
            ],
            'by_reference' => false,
            'allow_add' => true
        ])
    ;
}

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

这是我的 ClubHistoType ：

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        ->add('position', null, [
            'label' => false
        ])
        ->add('matches', null, [
            'label' => false
        ])
        ->add('victories', null, [
            'label' => false
        ])
        ->add('draws', null, [
            'label' => false
        ])
        ->add('losses', null, [
            'label' => false
        ])
        ->add('goals', null, [
            'label' => false
        ])
        ->add('points', null, [
            'label' => false
        ])
        ->add('season', EntityType::class, [
            'class' => Season::class,
            'choice_label' => 'year',
            'label' => false,
            'placeholder' => '-',
            'query_builder' => function (EntityRepository $er) {
                return $er->createQueryBuilder('s')
                    ->orderBy('s.year', 'ASC');
            }
        ])
        ->add('club', EntityType::class, [
            'class' => Club::class,
            'choice_label' => 'name',
            'label' => false,
            'required' => false,
            'placeholder' => '-',
            'query_builder' => function (EntityRepository $er) {
                return $er->createQueryBuilder('c')
                    ->orderBy('c.name', 'ASC');
            }
        ])
    ;
}

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

还有我在控制器中创建新国家/地区表的功能：

/**
 * @Route("back/table/new", name="new_table")
 */
public function createCountryTable(Request $request, EntityManagerInterface $manager) {
    $countryTable = new Classement();

    $clubHistoriques = new ClubHisto();
    $countryTable->addClubHisto($clubHistoriques);
    
    $form = $this->createForm(ClassementType::class, $countryTable);
    dd($form);
    
    $form->handleRequest($request);
    
    if($form->isSubmitted() && $form->isValid()) {
        // foreach($clubHistoriques as $histo) {
        //     $histo->setSeason($countryTable->getSeason());
        // }
        $manager->persist($countryTable);
        $manager->flush();

        return $this->redirectToRoute('edit_table', ['id' => $countryTable->getId()]);
    }


    return $this->render('back/createTables.html.twig', [
        'form' => $form->createView()
    ]);

}

但是一旦我调用表单，它就会给我这个错误：

必须管理传递给选择字段的“App\Entity\Classement”类型的实体。也许您忘记将其持久化在实体管理器中？

我不太明白，因为我还有其他形式与这个完全一样，而且一切正常......

我知道这个问题已经被问过很多次了，但是给出的解决方案从来没有奏效，但从来没有真正奏效过。

非常感谢您的帮助！

【问题讨论】：

标签： forms symfony entity

【解决方案1】：

尝试在没有$countryTable的情况下实例化您的表单

$form = $this->createForm(ClassementType::class);

您已经将表单绑定到数据，因此您不需要预先实例化它。

然后处理您的if (form->isSubmitted()) 逻辑中的数据

/* @var $countryTable \App\Entity\Classement */
$countryTable = $form->getData();
$clubHistos = $countryTable->getClubHistos();

【讨论】：