Symfony same #groups between two table with ManyToMany relations - symfony

Question

I want to have the same #groups between two table with ManyToMany relations: When i get on API Platform .../api/tags/1, I recieve only that without "tag".
{
"id": 1,
"title": "A ce monde que tu fais"
}
App\Entity\Song
/**
* #Groups({"song:read", "song:write"})
* #ORM\ManyToMany(targetEntity=Tag::class, inversedBy="songs", cascade={"persist"})
* #ORM\JoinTable(
* name="song_tag",
* joinColumns={
* #ORM\JoinColumn(name="song_id", referencedColumnName="id")
* },
* inverseJoinColumns={
* #ORM\JoinColumn(name="tag_id", referencedColumnName="id")
* })
*
*/
private $tags;
App\Entity\Tag
/**
* #Groups({"song:read", "song:write"})
* #ORM\ManyToMany(targetEntity=Song::class, mappedBy="tags")
*/
private $songs;
I think it's the join table between the two, it doesn't have a defined group. Can you help me?
Thanks

Answer 1

What do you mean by:
When i get on API Platform .../api/tags/1, I recieve only that without "tag".
From what I understand, your problem is likely the result of missing normalization context configuration. Tag endpoints, such as /api/tags/1, are not configured to apply the song:read and song:write serialization groups by default, resulting in these Tag fields being excluded in the response payload.
Consider adding song:read and song:write as default serialization groups for the Tag endpoints. Or preferably, specify tag:read and tag:write serialization groups and add them to the Song serialization groups. A simple example:
<?php declare(strict_types = 1);
namespace App\Entity;
use ApiPlatform\Core\Annotation\ApiResource;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity
* #ApiResource(
* itemOperations={
* "get"={
* "normalization_context"={
* "groups"={
* "song:read",
* },
* },
* },
* },
* )
*/
class Song
{
/**
* #Groups({
* "song:read",
* "tag:read",
* })
*/
private Collection $tags;
}
/**
* #ORM\Entity
* #ApiResource(
* itemOperations={
* "get"={
* "normalization_context"={
* "groups"={
* "tag:read",
* },
* },
* },
* },
* )
*/
class Tag
{
/**
* #Groups({
* "tag:read",
* "song:read",
* })
*/
private Collection $songs;
}
PS: Consider that the above example establishes a circular reference.

Answer 2

by
When i get on API Platform .../api/tags/1, I recieve only that without "tag".
I mean that when I make a request, I want to get the tags back. I've already tried it and it works with the oneToMany and the oneToOne but not for the ManyToMany.
I want
{
"id": 1,
"title": "world",
"category": {"id":54, "name":"hello"},
"tags": [{"id":12, "name":"city"}, {...}]
}
and I have only
{
"id": 1,
"title": "world",
"category": {"id":54, "name":"hello"},
}
I think it's really the join table between the two, it doesn't have a defined group because symfony did not create an entity and therefore no group...