iphp_file not displayed with sonata admin #46

/**
 * @ORM\Table(name="produit")
 */
class Produit
{
...

    /**
     * @var string
     *
     * @Assert\File( maxSize="20M")
     * @FileStore\UploadableField(mapping="image")
     * @ORM\Column(type="array",nullable = true)
     */
    private $image;
...
}

iphp_file_store:
    mappings:
       image:
           upload_dir:  %kernel.root_dir%/../web/files
           upload_path: /files
           delete_on_remove:     true
           overwrite_duplicates:  true
           directory_namer:
              property:
                  params: { field : "produitFolder"}
           namer:
               translit: ~
               property:
                   params: { field : id}

protected function configureFormFields(FormMapper $formMapper)
{
        $formMapper
            ->add('image', 'iphp_file')
}