ContextErrorException in Symfony 3 - image

Question

I am trying to upload images in SF3, and I have this error when I upload:
Missing argument 2 for Symfony\Component\HttpFoundation\File\UploadedFile::__construct().
This is the part of my entity where is the error is located (line 9 here):
public function preUpload()
{
// if there is no file (optional field)
if (null === $this->image) {
return;
}
// $file = new File($this->getUploadRootDir() . '/' . $this->image);
$file = new File($this->getUploadRootDir() .'/' . $this->image);
$uploadedfile = new UploadedFile($this->getUploadRootDir() .'/' . $this->image);
// the name of the file is its id, one should just store also its extension
// to make clean, we should rename this attribute to "extension" rather than "url"
$this->url = $file->guessExtension();
// and we generate the alt attribute of the <img> tag,
// the value of the file name on the user's PC
$this->alt = $uploadedfile->getClientOriginalName();
}
Then my controller :
public function mediaEditAction(Request $request)
{
$media = new Media();
$form = $this->createForm(MediaType::class, $media);
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
$file = $media->getImage();
$fileName = md5(uniqid()).'.'.$file->guessExtension();
$file->move(
$this->getParameter('images_directory'),
$fileName
);
$media->setImage($fileName);
$em = $this->getDoctrine()->getManager();
$em->persist($media);
$em->flush();
$request->getSession()->getFlashBag()->add('Notice', 'Photo added with success');
// redirection
$url = $this->generateUrl('medecin_parametre');
// permanent redirection with the status http 301
return $this->redirect($url, 301);
} else {
return $this->render('DoctixMedecinBundle:Medecin:mediaedit.html.twig', array(
'form' => $form->createView()
));
}
}

Answer 1

It seems like you are doing unnecessary work and making this a little more complicated than it probably needs to be. Have you followed this Symfony guide for How to Upload Files?
In the meantime, it seems like the image name is what is in $this->image so you can just pass that as the 2nd constructor argument.
$uploadedfile = new UploadedFile($this->getUploadRootDir().'/'.$this->image, $this->image);
However, UploadedFile should probably only come from the form submission, and in your entity you would want to use File instead - like so:
use Symfony\Component\HttpFoundation\File\File;
$uploadedfile = new File($this->getUploadRootDir() .'/' . $this->image);