symfony - Could not determine access type for property "file"

Question

I have a little problem with my image upload, can u help me please:

Could not determine access type for property "file".

Controller

/**
 * Creates a new Produits entity.
 *
 */
public function createAction(Request $request)
{
    $entity = new Produits();
    $form = $this->createCreateForm($entity);
    $form->handleRequest($request);

    if ($form->isValid()) {
        $em = $this->getDoctrine()->getManager();
        $em->persist($entity);
        $em->flush();

        return $this->redirect($this->generateUrl('adminProduits_show', array('id' => $entity->getId())));
    }

    return $this->render('EcommerceBundle:Administration:Produits/layout/new.html.twig', array(
        'entity' => $entity,
        'form'   => $form->createView(),
    ));
}

/**
 * Creates a form to create a Produits entity.
 *
 * @param Produits $entity The entity
 *
 * @return SymfonyComponentFormForm The form
 */
private function createCreateForm(Produits $entity)
{
    $form = $this->createForm(ProduitsType::class, $entity);

    $form->add('submit', SubmitType::class, array('label' => 'Ajouter'));

    return $form;
}

/**
 * Displays a form to create a new Produits entity.
 *
 */
public function newAction()
{
    $entity = new Produits();
    $form   = $this->createCreateForm($entity);

    return $this->render('EcommerceBundle:Administration:Produits/layout/new.html.twig', array(
        'entity' => $entity,
        'form'   => $form->createView(),
    ));
}

Form

/**
 * @param FormBuilderInterface $builder
 * @param array $options
 */
public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
    ->add('file', FileType::class, array('data_class' => null))
    ->add('name', TextType::class)
    ;
}

/**
 * @param OptionsResolver $resolver
 */
public function configureOptions(OptionsResolver $resolver)
{
    $resolver->setDefaults(array(
        'data_class' => 'EcommerceEcommerceBundleEntityMedia'
    ));
}
/**
 * @return string
 */
public function getName()
{
    return 'ecommerce_ecommercebundle_media';
}

Entity

    /**
 * @ORMColumn(name="name",type="string",length=255)
 * @AssertNotBlank()
 */
private $name;

/**
 * @ORMColumn(type="string",length=255, nullable=true)
 */
private $path;

/**
 * @AssertFile(
 *     maxSize = "1024k",
 *     mimeTypes = {"image/png", "image/jpg", "image/bmp"},
 *     mimeTypesMessage = "Please upload a valid PDF"
 * )
 */
public $file;

public function getUploadRootDir()
{
    return __dir__.'/../../../../web/uploads';
}

public function getAbsolutePath()
{
    return null === $this->path ? null : $this->getUploadRootDir().'/'.$this->path;
}

public function getAssetPath()
{
    return 'uploads/'.$this->path;
}

/**
 * @ORMPrePersist()
 * @ORMPreUpdate()
 */
public function preUpload()
{
    $this->tempFile = $this->getAbsolutePath();
    $this->oldFile = $this->getPath();
    $this->updateAt = new DateTime();

    if (null !== $this->file)
        $this->path = sha1(uniqid(mt_rand(),true)).'.'.$this->file->guessExtension();
}

/**
 * @ORMPostPersist()
 * @ORMPostUpdate()
 */
public function upload()
{
    if (null !== $this->file) {
        $this->file->move($this->getUploadRootDir(),$this->path);
        unset($this->file);

        if ($this->oldFile != null) unlink($this->tempFile);
    }
}

/**
 * @ORMPreRemove()
 */
public function preRemoveUpload()
{
    $this->tempFile = $this->getAbsolutePath();
}

/**
 * @ORMPostRemove()
 */
public function removeUpload()
{
    if (file_exists($this->tempFile)) unlink($this->tempFile);
}

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

public function getPath()
{
    return $this->path;
}

public function getName()
{
    return $this->name;
}

public function getFile()
{
    return $this->file;
}

/**
 * Set path
 *
 * @param string $path
 * @return String
 */
public function setPath($path)
{
    $this->path = $path;
    return $this;
}

/**
 * Set alt
 *
 * @param string $alt
 * @return String
 */
public function setAlt($alt)
{
    $this->alt = $alt;
    return $this;
}

/**
 * Set name
 *
 * @param string $name
 * @return String
 */
public function setName($name)
{
    $this->name = $name;
    return $this;
}

/**
 * Set updateAt
 *
 * @param DateTime $updateAt
 *
 * @return Media
 */
public function setUpdateAt($updateAt)
{
    $this->updateAt = $updateAt;

    return $this;
}

/**
 * Get updateAt
 *
 * @return DateTime
 */
public function getUpdateAt()
{
    return $this->updateAt;
}

Thanks for your help guys :)

Answer 1

Please add "'mapped' => false," to form builder.

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
   ->add('file', FileType::class, 
     array(
        'data_class' => null,
        'mapped' => false,            
    ))
    ->add('name', TextType::class)
    ;
 }

Those who say that it is wrong to dissolve, see the test there. I'm not the one who made it wrong.

Test code: https://github.com/symfony/property-access/blob/master/Tests/PropertyAccessorCollectionTest.php#L151

A second solution is to add function setXxx to the property that gives an error in class Entity.

public $xxx;

public function setXxx(Array $xxx)
{
    $this->xxx = $xxx;
}

Or

public function __construct()
{
    $this->xxx = new ArrayCollection();
}

Video Link: https://knpuniversity.com/screencast/doctrine-relations/create-genus-note

My English is bad, I can tell you.