我怎么能得到实体的ID字段形式<select> - How can i get ID of entity in Field form <select>

我有一个实体A和B(id、#报价)B (id、名称)

在Symfony中，我想要一个表单来创建实体a与一个选择字段，其中列出了所有B实体的标签B.name和值B.id

我现在有如下内容:

$builder->add('companyid', 'entity', array(
      'class' => 'Bundle:B',
      'property' => 'name',
));

我想生成这样的东西，只获取值的ID，而不是整个对象:

<option value="id_of_B">name_of_B</option>

第一种方法是使用datattransformer将表单值从实体转换为id属性。

services .

<service id="bundle.b_to_id_transformer" class="Bundle'Form'DataTransformer'BtoIdTransformer">
    <argument type="service" id="doctrine.orm.entity_manager" />
</service>

BtoIdTransformer.php

<?php
namespace Bundle'Form'DataTransformer;
use Doctrine'Common'Persistence'ObjectManager;
use Symfony'Component'Form'DataTransformerInterface;
use Symfony'Component'Form'Exception'UnexpectedTypeException;
use Bundle'Entity'B;
class BtoIdTransformer implements DataTransformerInterface
{
    /**
     * @var ObjectManager
     */
    protected $om;
    public function __construct(ObjectManager $om)
    {
        $this->om = $om;
    }
    /**
     * @param mixed $value
     * @return null|string
     */
    public function transform($value)
    {
        if (null === $value) {
            return null;
        }
        if (! $value instanceof B) {
            throw new UnexpectedTypeException($value, 'B');
        }
        return $value->getId();
    }
    /**
     * @param mixed $value
     * @return mixed|null
     */
    public function reverseTransform($value)
    {
        if (null === $value || '' === $value) {
            return null;
        }
        if (! is_string($value)) {
            throw new UnexpectedTypeException($value, 'string');
        }
        return $this->om->getRepository('Bundle:B')->find($value);
    }
}

将form定义为服务，并将datattransformer类注入其中。

services .

<service id="bundle.form.a" class="Bundle'Form'AType">
    <tag name="form.type" alias="bundle_a" />
    <argument type="service" id="bundle.b_to_id_transformer" />
</service>

类形式。

<?php
namespace Bundle'Form;
use Symfony'Component'Form'DataTransformerInterface;
use Symfony'Component'OptionsResolver'OptionsResolverInterface;
use Symfony'Component'Form'AbstractType;
use Symfony'Component'Form'FormBuilderInterface;
class AType extends AbstractType
{
    /**
     * @var DataTransformerInterface
     */
    protected $transformer;
    /**
     * @param DataTransformerInterface $transformer
     */
    public function __construct(DataTransformerInterface $transformer)
    {
        $this->transformer = $transformer;
    }
    /**
     * @param FormBuilderInterface $builder
     * @param array $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {          
        $builder->add($builder->create('companyid', 'entity', array(
            'label'         => 'companyid',
            'class'         => 'Bundle'Entity'B',
            'property'      => 'name',
            'query_builder' => function ($repository) {
                return $repository->createQueryBuilder('b');
            },
        ))->addModelTransformer($this->transformer));
    }
    /**
     * @param OptionsResolverInterface $resolver
     */
    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults([
            'data_class' => 'Bundle'Entity'A',
        ]);
    }
    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return 'bundle_a';
    }
}

第二种方法更简单。您可以将表单定义为服务，将实体管理器注入其中，并使用存储库方法中的所需值填充选择字段。

services .

<service id="bundle.form.a" class="Bundle'Form'AType">
    <tag name="form.type" alias="bundle_a" />
    <argument type="service" id="doctrine.orm.entity_manager" />
</service>

类形式。

<?php
namespace Bundle'Form;
use Doctrine'ORM'EntityManagerInterface;
use Symfony'Component'OptionsResolver'OptionsResolverInterface;
use Symfony'Component'Form'AbstractType;
use Symfony'Component'Form'FormBuilderInterface;
class AType extends AbstractType
{
    /**
     * @var EntityManagerInterface
     */
    protected $em;
    /**
     * @param EntityManagerInterface $em
     */
    public function __construct(EntityManagerInterface $em)
    {
        $this->em = $em;
    }
    /**
     * @param FormBuilderInterface $builder
     * @param array $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('companied', 'choice', [
            'label'    => 'companyid',
            'choices'  => $this->em->getRepository('Bundle:B')->getChoices(),
        ]);
    }
    /**
     * @param OptionsResolverInterface $resolver
     */
    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults([
            'data_class' => 'Bundle'Entity'A',
        ]);
    }
    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return 'app_a';
    }
}

BRepository.php

public function getChoices()
{
    $bs = $this->createQueryBuilder('b')
        ->getQuery()
        ->getResult();
    $result = [];
    /** @var B $b */
    foreach ($bs as $b) {
        $result[$b->getId()] = $b->getName();
    }
    return $result;
}