Error with array collection with a one to many relation - arrays

Question

I have a problem with a OneToMany relation and "array collection" between my entity CV and my entities, Formation, Skills and Experiences. A CV can have several formation, experiences or skills.
Even with Symfony documentation, I'm not even sure to get the issues.
Here is my Skills entity (formation and experiences are the same)
<?php
namespace App\Entity;
use ApiPlatform\Core\Annotation\ApiResource;
use App\Repository\SkillsRepository;
use Doctrine\ORM\Mapping as ORM;
/**
* #ApiResource()
* #ORM\Entity(repositoryClass=SkillsRepository::class)
*/
class Skills
{
/**
* #ORM\Id
* #ORM\GeneratedValue
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\Column(type="string", length=255)
*/
private $type;
/**
* #ORM\Column(type="string", length=255)
*/
private $title;
/**
* #ORM\Column(type="string", length=255)
*/
private $level;
/**
* #ORM\ManyToOne(targetEntity=Cv::class, inversedBy="id_skills")
* #ORM\JoinColumn(nullable=false)
*/
private $id_cv;
public function getId(): ?int
{
return $this->id;
}
public function getType(): ?string
{
return $this->type;
}
public function setType(string $type): self
{
$this->type = $type;
return $this;
}
public function getTitle(): ?string
{
return $this->title;
}
public function setTitle(string $title): self
{
$this->title = $title;
return $this;
}
public function getLevel(): ?string
{
return $this->level;
}
public function setLevel(string $level): self
{
$this->level = $level;
return $this;
}
public function getIdCv(): ?Cv
{
return $this->id_cv;
}
public function setIdCv(?Cv $id_cv): self
{
$this->id_cv = $id_cv;
return $this;
}
}
And my CV entity:
<?php
namespace App\Entity;
use ApiPlatform\Core\Annotation\ApiResource;
use App\Repository\CvRepository;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
/**
* #ApiResource()
* #ORM\Entity(repositoryClass=CvRepository::class)
*/
class Cv
{
/**
* #ORM\Id
* #ORM\GeneratedValue
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\OneToMany(targetEntity=Formation::class, mappedBy="id_cv", orphanRemoval=true)
*/
private $id_formation;
/**
* #ORM\OneToMany(targetEntity=Experiences::class, mappedBy="id_cv", orphanRemoval=true)
*/
private $id_experiences;
/**
* #ORM\OneToMany(targetEntity=Skills::class, mappedBy="id_cv", orphanRemoval=true)
*/
private $id_skills;
/**
* #ORM\Column(type="string", length=255)
*/
private $title;
/**
* #ORM\Column(type="string", length=255)
*/
private $url_perso;
/**
* #ORM\Column(type="string", length=255)
*/
private $video;
/**
* #ORM\OneToOne(targetEntity=Candidate::class, mappedBy="id_cv", cascade={"persist", "remove"})
*/
private $id_candidate;
public function __construct()
{
$this->id_formation = new ArrayCollection();
$this->id_experiences = new ArrayCollection();
$this->id_skills = new ArrayCollection();
}
public function getId(): ?int
{
return $this->id;
}
/**
* #return Collection|Formation[]
*/
public function getIdFormation(): Collection
{
return $this->id_formation;
}
public function addIdFormation(Formation $id_cv): self
{
if (!$this->id_formation->contains($id_cv)) {
$this->id_formation[] = $id_cv;
$id_cv->setIdCv($this);
}
return $this;
}
public function removeIdFormation(Formation $id_cv): self
{
if ($this->id_formation->removeElement($id_cv)) {
// set the owning side to null (unless already changed)
if ($id_cv->getIdCv() === $this) {
$id_cv->setIdCv(null);
}
}
return $this;
}
/**
* #return Collection|Experiences[]
*/
public function getIdExperiences(): Collection
{
return $this->id_experiences;
}
public function addIdExperience(Experiences $idExperience): self
{
if (!$this->id_experiences->contains($idExperience)) {
$this->id_experiences[] = $idExperience;
$idExperience->setIdCv($this);
}
return $this;
}
public function removeIdExperience(Experiences $idExperience): self
{
if ($this->id_experiences->removeElement($idExperience)) {
// set the owning side to null (unless already changed)
if ($idExperience->getIdCv() === $this) {
$idExperience->setIdCv(null);
}
}
return $this;
}
/**
* #return Collection|Skills[]
*/
public function getIdSkills(): Collection
{
return $this->id_skills;
}
public function addIdSkill(Skills $idSkill): self
{
if (!$this->id_skills->contains($idSkill)) {
$this->id_skills[] = $idSkill;
$idSkill->setIdCv($this);
}
return $this;
}
public function removeIdSkill(Skills $idSkill): self
{
if ($this->id_skills->removeElement($idSkill)) {
// set the owning side to null (unless already changed)
if ($idSkill->getIdCv() === $this) {
$idSkill->setIdCv(null);
}
}
return $this;
}
public function getTitle(): ?string
{
return $this->title;
}
public function setTitle(string $title): self
{
$this->title = $title;
return $this;
}
public function getUrlPerso(): ?string
{
return $this->url_perso;
}
public function setUrlPerso(string $url_perso): self
{
$this->url_perso = $url_perso;
return $this;
}
public function getVideo(): ?string
{
return $this->video;
}
public function setVideo(string $video): self
{
$this->video = $video;
return $this;
}
public function getIdCandidate(): ?Candidate
{
return $this->id_candidate;
}
public function setIdCandidate(?Candidate $id_candidate): self
{
// unset the owning side of the relation if necessary
if ($id_candidate === null && $this->id_candidate !== null) {
$this->id_candidate->setIdCv(null);
}
// set the owning side of the relation if necessary
if ($id_candidate !== null && $id_candidate->getIdCv() !== $this) {
$id_candidate->setIdCv($this);
}
$this->id_candidate = $id_candidate;
return $this;
}
}
In my CV entity, array collection and collection are underlined in red.I try to create my REST API.
When I do a post to create a CV, I have this error message:
Could not denormalize object of type
"Doctrine\Common\Collections\Collection", no supporting
normalizer found.
Do you have a clue about what's wrong?