symfony doctrine discriminator error serializer

Question

I use a platform to develop rest API, now when I have serialized data in normalize and denormalize I found an error. I use doctrine inheritance for entities, I have class person abstract class content commons attributes and I create class Partner, Participant, and declarant, all classes extend for person class, now when I add groups in Participant class I found error, the error is when I add a group in partner and declarant attributes it displays but when I add also a group in attributes class Person, attributes in class Participant is not display

Person entity:

<?php

    namespace App\Entity;

    use App\Repository\PersonRepository;
    use Doctrine\ORM\Mapping as ORM;
    use Symfony\Component\Validator\Constraints as Assert;
    use Symfony\Component\Serializer\Annotation\Groups;

    /**
     * @ORM\Entity(repositoryClass=PersonRepository::class)
     * @ORM\InheritanceType("JOINED")
     * @ORM\DiscriminatorColumn(name="discr", type="string")
     * @ORM\DiscriminatorMap({"partner" = "Partner", "supplier" = "Supplier", "declaring"= "Declaring", "particpant"= "Particpant"})
     */
    abstract class Person
    {
       use ResourceId;
       use AbstractEntity;

        /**
         * @ORM\Column(type="string", length=255)
         * @Groups({"readPartner","writePartner","readDeclaring",
         * "writeDeclaring","readSupplier","writeSupplier","readParticpant","writeParticpant"})
         */
        private $firstName;

        /**
         * @ORM\Column(type="string", length=255)
         * @Groups({"readPartner","writePartner","readDeclaring",
         * "writeDeclaring","readSupplier","writeSupplier","readParticpant","writeParticpant"})
         */
        private $lastName;

        /**
         * @ORM\Column(type="string", length=255)
         * @Groups({"readPartner","writePartner","readDeclaring",
         * "writeDeclaring","readSupplier","writeSupplier"})
         */
        private $personalPhone;

        /**
         * @ORM\Column(type="string", length=255,nullable=true)
         * @Groups({"readPartner","writePartner","readDeclaring"
         * ,"writeDeclaring","readSupplier","writeSupplier"})
         */
        private $professionalPhone;

        /**
         * @ORM\Column(type="string", length=255, nullable=true)
         * @Assert\Email(
         *     message = "The email '{{ value }}' is not a valid email."
         * )
         * @Groups({"readPartner","writePartner","readDeclaring",
         * "writeDeclaring","readSupplier","writeSupplier"})
         */
        private $email;

        /**
         * @ORM\Column(type="string", length=255)
         * @Groups({"readPartner","writePartner","readDeclaring"
         * ,"writeDeclaring","readSupplier","writeSupplier"})
         */
        private $organization;

        public function getFirstName(): ?string
        {
        return $this->firstName;
        }

        public function setFirstName(string $firstName): self
        {
        $this->firstName = $firstName;

        return $this;
        }

        public function getLastName(): ?string
        {
        return $this->lastName;
        }

        public function setLastName(string $lastName): self
        {
        $this->lastName = $lastName;

        return $this;
        }

        public function getPersonalPhone(): ?string
        {
        return $this->personalPhone;
        }

        public function setPersonalPhone(string $personalPhone): self
        {
        $this->personalPhone = $personalPhone;

        return $this;
        }

        public function getProfessionalPhone(): ?string
        {
        return $this->professionalPhone;
        }

        public function setProfessionalPhone(string $professionalPhone): self
        {
        $this->professionalPhone = $professionalPhone;

        return $this;
        }

        public function getEmail(): ?string
        {
        return $this->email;
        }

        public function setEmail(?string $email): self
        {
        $this->email = $email;

        return $this;
        }

        public function getOrganization(): ?string
        {
        return $this->organization;
        }

        public function setOrganization(string $organization): self
        {
        $this->organization = $organization;

        return $this;
        }

    }

Particpant entity:

<?php

    namespace App\Entity;

    use ApiPlatform\Core\Annotation\ApiResource;
    use App\Repository\ParticpantRepository;
    use Doctrine\ORM\Mapping as ORM;
    use Symfony\Component\Serializer\Annotation\Groups;
    /**
     * @ApiResource(
     *    normalizationContext={"groups"={"readParticpant"}},
     *    denormalizationContext={"groups"={"writeParticpant"}},
     * )
     * @ORM\Entity(repositoryClass=ParticpantRepository::class)
     */
    class Particpant extends Person
    {
       /**
        * @ORM\ManyToOne(targetEntity=Partner::class)
        * @ORM\JoinColumn(name="partner_id", referencedColumnName="id", nullable=true)
        * @Groups({"readParticpant","writeParticpant"})
        */
        protected $partner;

        /**
        * @ORM\ManyToOne(targetEntity=Declaring::class)
        * @ORM\JoinColumn(name="declaring_id", referencedColumnName="id", nullable=true)
        * @Groups({"readParticpant","writeParticpant"})
        */
        protected $declaring;


        /**
         * Get the value of partner
         */ 
        public function getPartner(): ?Partner
        {
        return $this->partner;
        }

        /**
         * Set the value of partner
         * @param Partner $partner
         * @return  self
         */ 
        public function setPartner(Partner $partner): self
        {
        $this->partner = $partner;

        return $this;
        }

        /**
         * Get the value of declaring
         */ 
        public function getDeclaring(): ?Declaring
        {
        return $this->declaring;
        }

        /**
         * Set the value of declaring
         * @param Declaring $declaring
         * @return  self
         */ 
        public function setDeclaring(Declaring $declaring): self
        {
        $this->declaring = $declaring;

        return $this;
        }
    }

how to display attributs of person entity and attribut of Participant also.. thanks for advanced

Answer 1

Even if doctrine supports inheritance very well, api-platform does not.

Deserialization ignore either parent class properties or child class properties.

The real question is why do you need inheritance?

1. to add a new entity class linked to Person?
2. to use polymorphism, like public function heal(Person $person): void {} ?
3. to gather common properties?

If it's the 1. , you're quite screwed up. For example, suppose you want to add a Dog class:

/*
 * @ApiResource
 * @ORM\Entity
 */
class Dog
{
    /*
     * @Column
     */
    private $name;

    /*
     * @var Person
     * @ManyToOne(class="Person")
     */
    private $owner;
}

Even with a concrete Person class, the serialization won't work as expected, the IRI generation does not detects the child class. You won't see several Dog instances like this:

{"name": "Bar", "owner": "/participants/1"}
{"name": "Foo", "owner": "/partners/2"}
{"name": "Dummy", "owner": "/declarants/4"}

Api-platform will try to create IRIs containing the /persons string. Fetching a /persons retrieve Person properties only.

If it's the 2. , your entities just need to implement a common interface, or you can use a visitor pattern.

If it's the 3. , the common way is to use doctrine embeddable objects . They supports the @Groups annotation.