symfony 3：尝试使用DataTransform转换字段的值

Question

我已在docs之后添加了此模型转换器：

        ->add('subtotal', MoneyType::class, array(
            'attr' => array('readonly' => true),
        ))
        ->addModelTransformer(new CallbackTransformer(
            // transform <br/> to \n so the textarea reads easier
            function ($originalDescription) {
                return $originalDescription;
            },
            function ($submittedDescription) {
                var_dump($submittedDescription); //<<<<<<<<<<<<
                // remove most HTML tags (but not br,p)
                $cleaned = strip_tags($submittedDescription, '<br><br/><p>');

                // transform any \n to real <br/>
                return str_replace("\n", '<br/>', $cleaned);
            }
        ))

问题：您可以看到var_dump（）正在输出整个实体，如下所示。我只期待subtotal提交字段的内容。

object(DefaultBundle\Entity\Bill)[682]
  protected 'id' => null
  private 'client' => 
    object(Proxies\__CG__\DefaultBundle\Entity\Client)[788]
      public '__initializer__' => null
      public '__cloner__' => null
      public '__isInitialized__' => boolean true
      protected 'id' => int 1
      private 'bills' (DefaultBundle\Entity\Client) => 
        object(Doctrine\ORM\PersistentCollection)[436]
          private 'snapshot' => 
            array (size=0)
              ...
          private 'owner' => 
            &object(Proxies\__CG__\DefaultBundle\Entity\Client)[788]
          private 'association' => 
            array (size=15)
              ...
          private 'em' => 
            object(Doctrine\ORM\EntityManager)[151]
              ...
          private 'backRefFieldName' => string 'client' (length=6)
          private 'typeClass' => 
            object(Doctrine\ORM\Mapping\ClassMetadata)[465]
              ...
          private 'isDirty' => boolean false
          protected 'collection' => 
            object(Doctrine\Common\Collections\ArrayCollection)[801]
              ...
          protected 'initialized' => boolean false
      protected 'name' => string 'Jose Manuel Fernandez Fernandez' (length=31)
      protected 'nif' => string '03113434P' (length=9)
      protected 'address' => string 'Bulevar' (length=39)
      protected 'phone' => string '633553423' (length=9)
      protected 'email' => string 'me@gmail.com' (length=21)
  protected 'numberPlate' => string 'fasdfdasf' (length=9)
  protected 'createdAt' => 
    object(DateTime)[453]
      public 'date' => string '2016-02-28 00:00:00.000000' (length=26)
      public 'timezone_type' => int 3
      public 'timezone' => string 'Europe/Madrid' (length=13)
  protected 'serialNumber' => string '5' (length=1)
  private 'servicesPerformed' => 
    array (size=1)
      0 => 
        array (size=4)
          'description' => string 'fasdf' (length=5)
          'quantity' => string '4234' (length=4)
          'unitPrice' => float 4234
          'price' => float 17926756
  protected 'subtotal' => null
  protected 'taxRate' => float 0.21
  protected 'tax' => float 3764618.76
  protected 'total' => float 21691374.76

这里有实体和表单类型：

class BillType extends AbstractType
{
    /**
     * @param FormBuilderInterface $builder
     * @param array $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $em = $options['em'];

        $builder
            ->add('serialNumber', TextType::class, array(
                'label' => 'Nº serie',
                'attr' => array('readonly' => true),
            ))
            ->add('createdAt', DateType::class, array(
                'label' => 'Fecha',
                'data' => new \DateTime("today"),
            ))
            ->add('client', null, array('label' => 'Cliente'))
            ->add('numberPlate', null, array(
                'label' => 'Número matrícula',
        //'data' => 'prueba'
        ))
            ->add('servicesPerformed', CollectionType::class, array(
                 'label' => false,
                 'entry_type' => ServicePerformedType::class,
                 'allow_add' => true,
                 'allow_delete' => true, 
                 'attr' => array('data-prototype' => 'jander'),
            ))
            ->add('subtotal', MoneyType::class, array(
                'attr' => array('readonly' => true),
                //'grouping' => true
            ))
            ->addModelTransformer(new CallbackTransformer(
                // transform <br/> to \n so the textarea reads easier
                function ($originalDescription) {
                    return $originalDescription;
                },
                function ($submittedDescription) {
var_dump($submittedDescription);
die("jlfs");
                    // remove most HTML tags (but not br,p)
                    $cleaned = strip_tags($submittedDescription, '<br><br/><p>');

                    // transform any \n to real <br/>
                    return str_replace("\n", '<br/>', $cleaned);
                }
            ))
            ->add('tax', MoneyType::class, array(
                'label' => 'I.V.A.',
                'attr' => array('readonly' => true),
                'grouping' => true
            ))
            ->add('total', MoneyType::class, array(
                'label' => 'Total',
                'attr' => array('readonly' => true),
                'grouping' => true
        ))
            ->add('Guardar', SubmitType::class)
        ->addEventListener(FormEvents::PRE_SET_DATA,
                function (FormEvent $event) use ($em) {
                    $repository = $em->getRepository('DefaultBundle:Bill');
                    $result = count($repository->findAll()) + 1; 

            $form = $event->getForm();  
            $data = $event->getData();  

                    if (!$data) {
                      $form->add('serialNumber', TextType::Class, array(
                          'data' => $result, 
                          'label' => 'Nº serie',
                          'attr' => array('readonly' => true)
                      )); 
                    } else { 
                      $form->add('serialNumber', TextType::Class, array(
                          'label' => 'Nº serie',
                          'attr' => array('readonly' => true)
                      )); 
                    }
            }
            )
        ;
    }




    /**
     * @param OptionsResolver $resolver
     */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'DefaultBundle\Entity\Bill',
            'em' => ''
        ));
    }
}



/**
 * DefaultBundle\Entity\Bill
 *
 * @ORM\Table
 * @ORM\Entity
 * @ORM\HasLifecycleCallbacks
 */
class Bill
{
     /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id; 

    /**
     * @ORM\ManyToOne(targetEntity="Client", inversedBy="bills")
     * @ORM\JoinColumn(name="client_id", referencedColumnName="id", nullable=false)
     **/
    private $client;

    /**
    * @ORM\Column(type="string")
    */
    protected $numberPlate;

    /**
    * @ORM\Column(type="date")
    */
    protected $createdAt;

    /**
    * @ORM\Column(type="string")
    */
    protected $serialNumber;

    /**
     * Features of the product.
     * Associative array, the key is the name/type of the feature, and the value the data.
     * Example:<pre>array(
     *     'size' => '13cm x 15cm x 6cm',
     *     'bluetooth' => '4.1'
     * )</pre>.
     *
     * @var array
     * @ORM\Column(type="array")
     */
    private $servicesPerformed = array();

    /**
    * @ORM\Column(type="float")
    */
    protected $subtotal;

    /**
    * @ORM\Column(type="float")
    */
    protected $taxRate = TaxRate::TAX_RATE;

    /**
    * @ORM\Column(type="float")
    */
    protected $tax;

    /**
    * @ORM\Column(type="float")
    */
    protected $total;

    public function __toString() 
    {
        return $this->numberPlate;
    }

    /**
     * Get id
     *
     * @return integer
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set numberPlate
     *
     * @param string $numberPlate
     *
     * @return Bill
     */
    public function setNumberPlate($numberPlate)
    {
        $this->numberPlate = $numberPlate;

        return $this;
    }

    /**
     * Get numberPlate
     *
     * @return string
     */
    public function getNumberPlate()
    {
        return $this->numberPlate;
    }

    /**
     * Set servicesPerformed
     *
     * @param array $servicesPerformed
     *
     * @return Bill
     */
    public function setServicesPerformed($servicesPerformed)
    {
        $this->servicesPerformed = $servicesPerformed;

        return $this;
    }

    /**
     * Get servicesPerformed
     *
     * @return array
     */
    public function getServicesPerformed()
    {
        return $this->servicesPerformed;
    }

    /**
     * Set subtotal
     *
     * @param string $subtotal
     *
     * @return Bill
     */
    public function setSubtotal($subtotal)
    {
        $this->subtotal = $subtotal;

        return $this;
    }

    /**
     * Get subtotal
     *
     * @return string
     */
    public function getSubtotal()
    {
        return $this->subtotal;
    }

    /**
     * Set taxRate
     *
     * @param string $taxRate
     *
     * @return Bill
     */
    public function setTaxRate($taxRate)
    {
        $this->taxRate = $taxRate;

        return $this;
    }

    /**
     * Get taxRate
     *
     * @return string
     */
    public function getTaxRate()
    {
        return $this->taxRate;
    }

    /**
     * Set tax
     *
     * @param string $tax
     *
     * @return Bill
     */
    public function setTax($tax)
    {
        $this->tax = $tax;

        return $this;
    }

    /**
     * Get tax
     *
     * @return string
     */
    public function getTax()
    {
        return $this->tax;
    }

    /**
     * Set total
     *
     * @param string $total
     *
     * @return Bill
     */
    public function setTotal($total)
    {
        $this->total = $total;

        return $this;
    }

    /**
     * Get total
     *
     * @return string
     */
    public function getTotal()
    {
        return $this->total;
    }

    /**
     * Set client
     *
     * @param \DefaultBundle\Entity\Client $client
     *
     * @return Bill
     */
    public function setClient(\DefaultBundle\Entity\Client $client)
    {
        $this->client = $client;

        return $this;
    }

    /**
     * Get client
     *
     * @return \DefaultBundle\Entity\Client
     */
    public function getClient()
    {
        return $this->client;
    }

    /**
     * Set createdAt
     *
     * @param \DateTime $createdAt
     *
     * @return Bill
     */
    public function setCreatedAt($createdAt)
    {
        $this->createdAt = $createdAt;

        return $this;
    }

    /**
     * Get createdAt
     *
     * @return \DateTime
     */
    public function getCreatedAt()
    {
        return $this->createdAt;
    }

    /**
     * Set serialNumber
     *
     * @param string $serialNumber
     *
     * @return Bill
     */
    public function setSerialNumber($serialNumber)
    {
        $this->serialNumber = $serialNumber;

        return $this;
    }

    /**
     * Get serialNumber
     *
     * @return string
     */
    public function getSerialNumber()
    {
        return $this->serialNumber;
    }
}

编辑：在@ejuhjav的答案之后，这是我的buildForm()函数：

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $em = $options['em'];

        $builder
            ->add('serialNumber', TextType::class, array(
                'label' => 'Nº serie',
                'attr' => array('readonly' => true),
                'data' => 6
            ))
            ->add('createdAt', DateType::class, array(
                'label' => 'Fecha',
                'data' => new \DateTime("today"),
            ))
            ->add('client', null, array('label' => 'Cliente'))
            ->add('numberPlate', null, array(
                'label' => 'Número matrícula',
        //'data' => 'prueba'
        ))
            ->add('servicesPerformed', CollectionType::class, array(
                 'label' => false,
                 'entry_type' => ServicePerformedType::class,
                 'allow_add' => true,
                 'allow_delete' => true, 
                 'attr' => array('data-prototype' => 'jander'),
            ))
            ->add('subtotal', MoneyType::class, array(
                'attr' => array('readonly' => true),
                'data' => 6
            ))
            ->add('tax', MoneyType::class, array(
                'label' => 'I.V.A.',
                'attr' => array('readonly' => true),
                'grouping' => true,
                'data' => 6
            ))
            ->add('total', MoneyType::class, array(
                'label' => 'Total',
                'attr' => array('readonly' => true),
                'grouping' => true,
                'data' => 6
        ))
            ->add('Guardar', SubmitType::class)
        ;

        $builder->get('subtotal')
            ->addModelTransformer(new CallbackTransformer(
                // transform <br/> to \n so the textarea reads easier
                function ($originalDescription) {
                    return $originalDescription;
                },
                function ($submittedDescription) {
                    //var_dump($submittedDescription);
                    die("IT IS _NOT_ ENTERING HERE!!! :)");
                    // remove most HTML tags (but not br,p)
                    $cleaned = strip_tags($submittedDescription, '<br><br/><p>');

                    // transform any \n to real <br/>
                    return str_replace("\n", '<br/>', $cleaned);
                }
            ));
    }

Answer 1

您正在将模型转换器连接到整个表单。要将变换器添加到单个字段，请使用（来自引用的文档）：

$builder->add('description', TextareaType::class);

$builder->get('description')
        ->addModelTransformer(new CallbackTransformer(
...

或

$builder->add(
    $builder->create('description', TextareaType::class)
        ->addModelTransformer(...)
);