问题：

Question

问题：

我有一个实体合同，它与一个，一个实体客户端相关联。要选择哪个客户端链接到正在创建的合同，我将通过AJAX搜索呈现select2，将一些客户端加载到组件上。表示客户端的元素必须是ChoiceType。

在我的后端，我需要：

FormEvent PRE_SUBMIT以使用所提交的选项覆盖ChoiceType表单元素。
DataTransformer，它将提交的选项的ID转换为实际的实体客户端。

与Data Transformers Docs中的示例相比，所需的结构

ClientesBundle/
├── Controller
│   └── DefaultController.php
├── DataTransformer
│   └── ClienteTransformer.php
├── Entity
│   ├── Cliente.php
│   └── Contrato.php
├── Form
│   └── ClienteType.php
├── Repository
│   ├── ClienteRepository.php
│   └── ContratoRepository.php
└── Resources
    ├── config
    │   ├── routing.yml
    │   └── services.yml
    └── views
        └── ...

在这个结构中，我会在ClienteTransformer.php中使用ClienteType.php并直接在DefaultController中调用

$form = $this->createFormBuilder(Cliente::class)->add('titular', ClienteType::class);
$form->getForm();

我遇到的主要问题：

上述提到无法实现将这两个元素添加到控制器中的表单，因为PRE_SUBMIT FormEvent将覆盖->addModelTransformer($clientTransformer);导致错误。由此得出，我们无法定义CallbackTransformer内联，或其他不涉及this post中公开的解决方案的选项。
Symfony文档中给出的示例对于我在渲染之前如何创建，检索或修改表单并不清楚。在"How to Create a Custom Form Field Type"中，我可以理解所有内容，直到使用字段类型，这是在另一个自定义字段中完成的：我应该如何直接在控制器中使用自定义字段类型？就像我一样已定义的类型。以下代码有效。但是，如果我将TextType更改为ClienteType（这是我的自定义字段类型），我会收到错误 - Expected argument of type "object, array or empty", "string" given - 。 DefaultController.php
中的注释指出了引发错误（或向我显示）的确切行
```
public function buildFormContrato($entity = null)
{
    $logger = $this->get('logger');

    $form = $this->createFormBuilder($entity ?? new Contrato());
    $form->add('titular', TextType::class);

    return $form;
}
```

的src / ClientesBundle /窗体/ ClienteType.php

<?php

namespace ClientesBundle\Form;

use ...

class ClienteType extends AbstractType
{
    protected $em;

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

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $clienteTransformer = new ClienteTransformer($this->em);

        $builder
            ->add('titular', ChoiceType::class,
               ['placeholder' => 'Selecciona un cliente']
            );

        $builder->get('titular')
            ->addModelTransformer($clienteTransformer);

        $builder->addEventListener(FormEvents::PRE_SUBMIT,
            function (FormEvent $event)
            {
                $data = $event->getData();
                $form = $event->getForm();

                $form->add('titular', ClienteType::class,
                    ['choices' => [
                        $this->em->getRepository(Cliente::class)
                            ->find($data['titular'])
                        ]
                    ]
                );
            });

        return $builder;

    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => Cliente::class,
            'compound' => true // Set to true tipped by error 'You cannot add children to a simple form. Maybe you should set the option "compound" to true?'
        ));
    }

    public function getParent()
    {
        return ChoiceType::class;
    }


}

的src / ClientBundle / DataTransformer / ClienteTransformer.php

<?php

namespace ClientesBundle\DataTransformer;

use ...

class ClienteTransformer implements DataTransformerInterface
{

    private $em;

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

    /**
     * Transforms an object (cliente) to a string (string).
     *
     * @param  Cliente|null $cliente
     * @return string
     */
    public function transform($cliente)
    {
        if (null === $cliente) {
            return '';
        }

        return $cliente->getDni();
    }

    /**
     * Transforms a string (dni) to an object (cliente).
     *
     * @param  string $issueNumber
     * @return Cliente|null
     * @throws TransformationFailedException if object (cliente) is not found.
     */
    public function reverseTransform($clienteDni)
    {
        // no issue number? It's optional, so that's ok
        if (!$clienteDni) {
            return null;
        }

        $cliente = $this->em
            ->getRepository(Cliente::class)
            // query for the issue with this id
            ->find($clienteDni)
        ;

        if (null === $cliente) {
            // causes a validation error
            // this message is not shown to the user
            // see the invalid_message option
            throw new TransformationFailedException(sprintf(
                'El cliente con dni "%s" no existe!',
                $clienteDni
            ));
        }

        return $cliente;
    }
}

的src / ClientBundle /资源/配置/ services.yml

services:
    clientes.form.type:
        class: ClientesBundle\Form\ClienteType
        tags:
            - { name: form.type, alias: clienteType }
        arguments: [ '@doctrine.orm.entity_manager', '@form.factory']

的src / ClientBundle /控制器/ DefaultController

<?php

namespace ClientesBundle\Controller;

use ...
class DefaultController extends Controller
{
    ...

    public function buildFormContrato($entity = null)
    {

        $logger = $this->get('logger');

        $form = $this->createFormBuilder($entity ?? new Contrato());
        $form->add('titular', ClienteType::class);

        return $form;
    }

    ...

    public function nuevoContratoAction(Request $request)
    {

        $logger = $this->get('logger');

        $form = $this->buildFormContrato()
            ->add('finalizar', SubmitType::class) //THIS IS THE LINE I GET THE ERROR ON.
            ->getForm();

        $form->handleRequest($request);

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

    return $this->render(
        'ClientesBundle:Default:nuevoContrato.html.twig',
        ['form' => $form->createView()]);
    }
}

我主要使用以下文件解决了这个问题：

Create a custom Field Type

Data Transformers

Symfony2 form events and model transformers

Symfony data transformer with a collection field

Answer 1

看一下示例：类IssueSelectorType扩展AbstractType 在https://symfony.com/doc/current/form/data_transformers.html

class TitularType extends AbstractType
{
    private $transformer;

    public function __construct(ClienteTransformer $transformer)
    {
        $this->transformer = $transformer;
    }

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->addModelTransformer($this->transformer);
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'invalid_message' => 'The selected NIF does not exist',
        ));
    }

    public function getParent()
    {
        return TextType::class;
    }
}

将从您的服务定义中调用该构造：

services:
    clientes.form.titular:
        class: ClientesBundle\Form\TitularType
        arguments: [ @clientes.transformer.client_nif ]
        tags:
            - { name: form.type, alias: titular }

使用数据变形金刚＆amp; symfony3上的FormEvents（PRE_SUBMIT）在控制器

问题：

我遇到的主要问题：

的src / ClientesBundle /窗体/ ClienteType.php

的src / ClientBundle / DataTransformer / ClienteTransformer.php

的src / ClientBundle /资源/配置/ services.yml

的src / ClientBundle /控制器/ DefaultController

1 个答案: