Api plateform denormalization on custom operation problem - symfony

Question

I have an entity Voucher that contain a custom operation name add_voucher:
<?php
/**
* #ApiResource(
* collectionOperations={
* "add_voucher"={
* "access_control"="is_granted('ROLE_COMMERCIAL')",
* "method"="POST",
* "path"="/vouchers/add-new",
* "controller"=AddVoucherAction::class,
* "denormalization_context"={
* "groups"={"add_new_voucher"}
* },
* "validation_groups"={"Default", "add_voucher_validation"}
* },
* }
* )
* #ORM\Entity(repositoryClass="App\Repository\VoucherRepository", repositoryClass=VoucherRepository::class)
*/
class Voucher
{
/**
* #ORM\Id()
* #ORM\GeneratedValue()
* #ORM\Column(type="integer")
*/
private $id;
/**
* #Groups("add_new_voucher")
* #ORM\Column(type="string", length=255, unique=true)
*/
private $code;
/**
* #Groups("add_new_voucher")
* #ORM\Column(type="integer")
*/
private $discount;
/**
* #Groups("add_new_voucher")
* #ORM\Column(type="datetime")
*/
private $starts_at;
public function getDiscount()
{
return $this->discount;
}
public function setDiscount($discount): void
{
$this->discount = $discount;
}
public function getId(): ?int
{
return $this->id;
}
public function getCode(): ?string
{
return $this->code;
}
public function setCode(string $code): self
{
$this->code = $code;
return $this;
}
public function getStartsAt(): ?\DateTimeInterface
{
return $this->starts_at;
}
public function setStartsAt(\DateTimeInterface $starts_at): self
{
$this->starts_at = $starts_at;
return $this;
}
}
I added the denormalization group to code,discount,starts_at, I Later to validate this columns in operations to do so I need to add it first in the denormalization context but in the swagger it show only
the code and discount properties

Answer 1

It is because of the spelling combination of your $starts_at property and getStartsAt() getter. Basically, Symfony serializer use yours getters to access private properties.
Just replace either your property by $starstAt or add an underscore to your getter.
Take a look at this;