Symfony: How to upload multiple files - php

Question

I'm pretty new to Symfony and I'm trying to upload multiple files (images) using Symfony Forms and the Vichuploader-Bundle.
My TestObjectType looks like this, which should hold a collection of Image objects:
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('images', CollectionType::class, array(
'entry_type' => new ImageFormType(),
));
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(array(
'data_class' => TestObject::class
));
}
ImageFormType:
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('imageFile', VichImageType::class, array(
'required' => false,
));
}
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(array(
'data_class' => Image::class
));
}
Part of the controller code:
public function newAction(Request $request)
$form = $this->createForm(TestObjectType::class, $testObject);
$form->handleRequest($request);
if ($form->isValid()) {
$em = $this->getDoctrine()->getManager();
$em->persist($testObject);
$em->flush();
return $this->redirectToRoute("home");
}
}
I get the following error while submitting:
Neither the property "imageFile" nor one of the methods "getImageFile()", "imageFile()", "isImageFile()", "hasImageFile()", "__get()" exist and have public access in class "TestBundle\Entity\TestObject".
My TestObject does not have an imageFile property, however my Image object does. So what is missing here? Why is the imageFile property of the Image object not used? I've already read How to Upload Files and CollectionType Field but it did not helped much.
EDIT
Maybe a snippet of my entities could be useful:
TestObject
/**
* #ORM\OneToMany(targetEntity="TestBundle\Entity\Image", mappedBy="testObject")
*/
private $images;
Image
/**
* NOTE: This is not a mapped field of entity metadata, just a simple property.
*
* #Vich\UploadableField(mapping="product_image", fileNameProperty="imageName")
*
* #var File|\Symfony\Component\HttpFoundation\File\UploadedFile $image
*/
private $imageFile;
/**
* #ORM\Column(type="string", length=255)
*
* #var string
*/
private $imageName;
/**
* #ORM\ManyToOne(targetEntity="TestBundle\Entity\TestObject", inversedBy="images")
* #ORM\JoinColumn(name="test_object_id", referencedColumnName="id")
*/
private $testObject;

Answer 1

I think I found the solution: Symfony`s cache make me angry! A simple
php app/console cache:clear
did the trick! Argh, that took me hours!