Symfony Form CollectionType with a media field (VichUpload for example) - forms

Question

I've got a problem with my collection of object which have a media field.
Entity Section with a collection of sectionContent:
class Section
{
/**
* #var ArrayCollection|Collection|SectionContent[]
* #ORM\OneToMany(targetEntity="MyBundle\Entity\SectionContent", mappedBy="section", cascade={"persist", "remove"})
* #Groups({"section_full"})
*/
protected Collection $sectionContents;
}
Form :
->add(
'sectionContents',
CollectionType::class, [
'entry_type' => SectionContentType::class,
'required' => false,
'allow_add' => true,
'allow_delete' => true,
'by_reference' => false,
'delete_empty' => true,
]
)
SectionContent entity with a picture field
class SectionContent
{
/**
* #Groups({"section_full"})
*
* #ORM\ManyToOne(targetEntity="MyBundle\Entity\PublicMedia", cascade={"persist", "remove"})
* #ORM\JoinColumns({
* #ORM\JoinColumn(name="public_media_id", referencedColumnName="id")
* })
*
* #var PublicMedia
*/
protected $picture;
}
Form:
->add(
'picture',
SectionPictureType::class,
[
'label' => false,
'required' => false
]
)
PublicMedia entity is a Vich/Uploadable class
/**
* #ORM\MappedSuperclass
* #Vich\Uploadable
*/
abstract class PublicMedia
{
/**
* #Vich\UploadableField(mapping="public_media_uploader", fileNameProperty="filename")
*
* #var File|string
*/
private $file;
}
If I've got an Section like this :
"sections": {
"0": {
"id": 1,
"sectionContents": {
"0": {
"id": 1,
"picture": {
"id": 1,
"uuid": "uuid1",
"filename": "test_1.png"
}
},
"1": {
"id": 2,
"picture": {
"id": 2,
"uuid": "uuid2",
"filename": "test_2.png"
}
}
}
}
},
I've got two pictures test_1 and test_2 saved in a directory on my project (web/upload/section/setion_content for example), but when I delete the first one (test_1), symfony didn't delete the linked picture as I expected.
It update the first section with the data of the second so I've got:
"sections": {
"0": {
"id": 1,
"sectionContents": {
"0": {
"id": 1,
"picture": {
"id": 1,
"uuid": "uuid1",
"filename": "test_2.png"
}
}
}
}
},
As I understand, symfony update the first section data with the second and delete the second, but when it delete the second section, it delete the linked picture as well so I've got a section with test_2 picture on data and test_1 linked picture on the directory. So my sectionContent is linked to a deleted picture and I've got a picture without linked sectionContent.
Before:
[{picture: {filename: test_1}}, {picture: {filename: test_2}}] -> web/upload/.../test_1 and web/upload/.../test_2
After:
[{picture: {filename: test_2}}] -> web/upload/.../test_1
I don't know how to fix that ...
When I delete a sectionContent I want to delete the linked picture and not the last one !
Do you have some ideas please ?