No consigo pasar el "entity_manager" al DataTransformer

Por favor, necesito ayuda con esto. código en línea

<?php
namespace AppBundle\Form\DataTransformer;
 
use AppBundle\Entity\Content;
use Doctrine\Common\Persistence\ObjectManager;
use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Form\Exception\TransformationFailedException;
 
class ContentToNumberTransformer implements DataTransformerInterface
{
    private $om;
 
    public function __construc(ObjectManager $om){
        $this->om = $om;
    }
    /**
     * Transforma un object Content a un string: su id.
     *
     * @param  Content|null $content
     * @return string
     */
    public function transform($content){
        if (null === $content) {
            return '';
        }       
        return $content->getId();
    }
    /**
    * Transforma un string (id) en un objecto Content.
    *
    * @param  string $id
    * @return Content|null
    * @throws TransformationFailedException if object (Content) is not found.
    */
    public function reverseTransform($id){
        if (!$id) {
            return;
        }       
die(var_dump($this->om)); // AQUI OBTENGO NULL
        $content = $this->om
            ->getRepository("AppBundle:Content")->find($id);        
        if (null === $content) {
            throw new TransformationFailedException(sprintf(
                    'El Contenido con id "%s" no existe!',
                    $id
                    ));
        }       
        return $content;
    }
}
<?php
namespace AppBundle\Form;
 
use AppBundle\Form\DataTransformer\ContentToNumberTransformer;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Doctrine\Common\Persistence\ObjectManager;
use Symfony\Component\Form\Extension\Core\Type\HiddenType;
use Symfony\Component\Form\Extension\Core\Type\TextType;
 
class RelatedType extends AbstractType
{
    private $om;
 
    public function __construct(ObjectManager $om){
        $this->om = $om;
    }   
    public function buildForm(FormBuilderInterface $builder, array $options){
        $builder
        ->add('id',HiddenType::class,array('invalid_message' => 'El Contenido relacionado no es válido.'))
            ->add('title',TextType::class,array('mapped'=>false,'label'=>false));
        $builder->get('id')->addModelTransformer(new ContentToNumberTransformer($this->om));
    }
    public function configureOptions(OptionsResolver $resolver) {
        $resolver->setDefaults(array(
                'compound' => true,
        ));
    }
    public function getParent(){
        return HiddenType::class;
    }
    public function getName(){
        return 'related';
    }
}

services.yml

services:                
    app.form.type.related:
            class: AppBundle\Form\RelatedType
            arguments: ['@doctrine.orm.entity_manager']
            tags:
                - { name: form.type }

Respuestas

#1

Hola @espantaperros_

Revisa el método construc debe ser contruct()

y otra cosa es que en el servicio estás inyectando el EntityManager pero el constructor esta recibiendo el ObjectManager

Saludos.