Symfony2數據轉換器不能轉換

Question

嗨，大家好我試圖讓FloorType窗體有一個隱藏的對象域（我正在建設），我不能轉換對象實體我有使用轉換代碼從食譜。

http://symfony.com/doc/2.7/cookbook/form/data_transformers.html

下面是代碼：

變壓器

namespace George\FloorBundle\Form\DataTransformer; 

use George\ObjectsBundle\Entity\Object; 
use Doctrine\Common\Persistence\ObjectManager; 
use Symfony\Component\Form\DataTransformerInterface; 
use Symfony\Component\Form\Exception\TransformationFailedException; 

class ObjectToNumberTransformer implements DataTransformerInterface 
{ 
private $manager; 

public function __construct(ObjectManager $manager) 
{ 
    $this->manager = $manager; 
} 

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

    return $object->getId(); 
} 

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

    $object= $this->manager 
     ->getRepository('ObjectsBundle:Object') 
     // query for the issue with this id 
     ->find($objectNumber) 
    ; 

    if (null === $object) { 
     // causes a validation error 
     // this message is not shown to the user 
     // see the invalid_message option 
     throw new TransformationFailedException(sprintf(
      'An issue with number "%s" does not exist!', 
      $objectNumber 
     )); 
    } 

    return $object; 
} 
} 

落地式

namespace George\FloorBundle\Form; 

use Symfony\Component\Form\AbstractType; 
use Symfony\Component\Form\FormBuilderInterface; 
use Symfony\Component\OptionsResolver\OptionsResolverInterface; 
use George\FloorBundle\Form\DataTransformer\ObjectToNumberTransformer; 
use Doctrine\Common\Persistence\ObjectManager; 

class FloorType extends AbstractType 
{ 
private $manager; 

public function __construct(ObjectManager $manager) 
{ 
    $this->manager = $manager; 
} 
/** 
* @param FormBuilderInterface $builder 
* @param array $options 
*/ 
public function buildForm(FormBuilderInterface $builder, array $options) 
{ 

    $builder 
     ->add('translations', 'a2lix_translations',array(
      'required_locales' => array('bg','en') 
     )) 
    ->add('object')->addModelTransformer(new ObjectToNumberTransformer($this->manager)); 
} 

/** 
* @param OptionsResolverInterface $resolver 
*/ 
public function setDefaultOptions(OptionsResolverInterface $resolver) 
{ 
    $resolver->setDefaults(array(
     'data_class' => 'George\FloorBundle\Entity\Floor' 
    )); 
} 

/** 
* @return string 
*/ 
public function getName() 
{ 
    return 'george_floorbundle_floor'; 
} 
} 

CreateCreteForm

private function createCreateForm(Floor $entity) 
{ 
    $manager = $this->getDoctrine()->getManager(); 
    $form = $this->createForm(new FloorType($manager), $entity, array(
     'action' => $this->generateUrl('admin_floor_create'), 
     'method' => 'POST', 
    )); 

    $form->add('submit', 'submit', array('label' => 'Create')); 

    return $form; 
} 

服務

<services> 
    <service id="app.form.type.task" class="George\FloorBundle\Form\FloorType"> 
     <tag name="form.type" /> 
     <argument type="service" id="doctrine.orm.entity_manager"></argument> 
    </service> 
</services> 

而大胖子的錯誤是：

Catchable Fatal Error: Object of class George\ObjectsBundle\Entity\Object could not be converted to string 

有意思的是，該服務沒有工作，我需要把在創建形成經理：

$manager = $this->getDoctrine()->getManager(); 

讓我明白了變壓器失敗，但我看不到的地方......有人可以幫我這個轉變？

Answer 1

你的語法是關閉的只是一個位。 $ builder-> add實際上會返回一個構建器對象，而不是添加的表單對象。書中顯示：

$builder->add(
    $builder->create('description', 'textarea') 
    ->addModelTransformer(...) 
); 

在你的情況下，它會是這樣的：

$builder 
    ->add('translations', 'a2lix_translations',array(
     'required_locales' => array('bg','en') 
)) 
    ->add(
    $builder->create('object','text') 
     ->addModelTransformer(new ObjectToNumberTransformer($this->manager)) 
)); 

可能具有括號搞砸了，但你的想法。

Answer 2

關於第二個問題的解決辦法是在服務中使用別名：

<services> 
    <service id="app.form.type.floor" class="George\FloorBundle\Form\FloorType"> 
     <tag name="form.type" alias="george_floorbundle_floor" /> 
     <argument type="service" id="doctrine.orm.entity_manager"></argument> 
    </service> 
</services> 

而且在那裏我創建的形式：

$form = $this->createForm('george_floorbundle_floor', $entity, array(
    'action' => $this->generateUrl('admin_floor_update', array('id' => $entity->getId())), 
    'method' => 'PUT', 
    )); 

Answer 3

你應該使用這個

$builder 
    ->add('translations', 'a2lix_translations',array(
     'required_locales' => array('bg','en') 
    )) 
->add('object'); 
$builder->get('object')->addModelTransformer(new ObjectToNumberTransformer($this->manager)); 

而不是

$builder 
     ->add('translations', 'a2lix_translations',array(
      'required_locales' => array('bg','en') 
     )) 
     ->add('object')->addModelTransformer(new ObjectToNumberTransformer($this->manager)); 

希望它有幫助！