File fixture with Alice - symfony

Question

Is there a way to have a fixture with a file, with hautelook/alice-bundle ?
I'm trying to do :
App\Entity\MediaObject:
media_object_1:
file: '<file("./fixtures/files", "./public/media", true)>'
But this is not working, because the file function return a string, and not the file itself
<?php
namespace App\Entity;
use ApiPlatform\Doctrine\Orm\Filter\SearchFilter;
use ApiPlatform\Metadata\ApiFilter;
use ApiPlatform\Metadata\ApiProperty;
use ApiPlatform\Metadata\ApiResource;
use ApiPlatform\Metadata\Delete;
use ApiPlatform\Metadata\Get;
use ApiPlatform\Metadata\GetCollection;
use ApiPlatform\Metadata\Post;
use App\Controller\CreateMediaObjectAction;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\HttpFoundation\File\File;
use Symfony\Component\Serializer\Annotation\Groups;
use Symfony\Component\Validator\Constraints as Assert;
use Vich\UploaderBundle\Mapping\Annotation as Vich;
#[Vich\Uploadable]
#[ORM\Entity]
#[ApiResource(
normalizationContext: ['groups' => ['media_object:read']],
types: ['https://schema.org/MediaObject'],
operations: [
new Get(),
new GetCollection(),
new Post(
controller: CreateMediaObjectAction::class,
deserialize: false,
validationContext: ['groups' => ['Default', 'media_object_create']],
openapiContext: [
'requestBody' => [
'content' => [
'multipart/form-data' => [
'schema' => [
'type' => 'object',
'properties' => [
'file' => [
'type' => 'string',
'format' => 'binary'
]
]
]
]
]
]
]
),
new Delete()
]
)]
class MediaObject
{
#[ORM\Id, ORM\Column, ORM\GeneratedValue]
#[Groups(['media_object:read'])]
private ?int $id = null;
#[ApiProperty(types: ['https://schema.org/contentUrl'])]
#[Groups(['media_object:read'])]
public ?string $contentUrl = null;
#[Vich\UploadableField(mapping: "media_object", fileNameProperty: "filePath")]
#[Assert\NotNull(groups: ['media_object_create'])]
public ?File $file = null;
#[ORM\Column(nullable: true)]
public ?string $filePath = null;
public function getId(): ?int
{
return $this->id;
}
}
When I launch the fixture command, i got :
In HydrationExceptionFactory.php line 67:
Invalid value given for the property "file" of the object "media_object_1" (class: App\Entity\MediaObject).
In PropertyAccessor.php line 213:
Expected argument of type "?Symfony\Component\HttpFoundation\File\File", "string" given at property path "file".
In PropertyAccessor.php line 530:
Cannot assign string to property App\Entity\MediaObject::$file of type ?Symfony\Component\HttpFoundation\File\File