Symfony表单-CollectionType中子条目Type内的访问实体


Symfony form - Access Entity inside child entry Type in a CollectionType

我正在尝试访问FormBuilder:内父CollectionType中给定嵌入表单的实体

ParentType

Class ParentType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('children', CollectionType::class, array(
            'entry_type' => ChildType::class
        );
    }
}

子类型

class ChildType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $child = $builder->getData(); // this returns null
    }
    public function getDefaultOptions(array $options)
    {
        return array(
            'data_class' => 'Vendor'Bundle'Entity'Child',
        );
    }
}

虽然这在正常形式下有效,但$child将作为null返回。如何访问ChildType中的Child实体?

答案在于使用事件侦听器来侦听PRE_SET_DATA事件。

它将向您的闭包传递一个FormEvent类,该类包含表单和绑定到它的数据

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder->addEventListener(FormEvents::PRE_SET_DATA,
        function (FormEvent $event) use ($builder)
        {
            $form = $event->getForm();
            $child = $event->getData();
            if ($child instanceof Child) {
                // Do what ever you like with $child entity data
            }
        }
    );
}

这是一个基于user1207727的更详细的解决方案。

父类型

class FrontentStatsInputFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('records', CollectionType::class, array(
                'entry_type' => FrontendStatsRecordType::class,
                'allow_add' => false,
                'allow_delete' => false,
                'label' => null,
            ))
        ;
    }
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => null
        ));
    }
}

子类型

class FrontendStatsRecordType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->addEventListener(FormEvents::PRE_SET_DATA,
            function (FormEvent $event) use ($builder)
            {
                $form = $event->getForm();
                $child = $event->getData();
                if ($child instanceof StatsRecord) {
                    // Do what ever you like with $child entity data
                    // $child->getSomeValue();
                    $form->add('value', TextType::class);
                }
            }
        );
    }
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'AppBundle'Entity'StatsRecord',
        ));
    }
}

在控制器中创建表单

public function indexAction(Request $request, InputForm $inputForm) {
    $data = array();
    foreach ($inputForm->getStatsTemplates() as $template) {
        $statsRecord = new StatsRecord();
        $data['records'][] = $statsRecord;
    }

    $form = $this->createForm('AppBundle'Form'FrontentStatsInputFormType', $data);
    $form->handleRequest($request);

    if ($form->isSubmitted() && $form->isValid()) {
        $em = $this->getDoctrine()->getManager();
        // Get entries and persist them in the database
        $records = $form->get('records')->getData();
        foreach ($records as $record) {
            $em->persist($record);
        }
        $em->flush();
        return $this->redirectToRoute('frontend_index');
    }
    return $this->render('frontend/showInputForm.html.twig', array(
        'inputForm' => $inputForm,
        'form' => $form->createView(),
    ));
}