internship-playground/src-php/app/internship/bo/Category.php

<?php

namespace internship\bo;

use n2n\persistence\orm\attribute\ManyToMany;
use nql\bo\BlogArticle;
use n2n\reflection\ObjectAdapter;
use n2n\persistence\orm\CascadeType;

class Category extends ObjectAdapter implements \JsonSerializable {

	public int $id;

	public string $name;

	/**
	 * @var \ArrayObject<Article>
	 */
	#[ManyToMany(Article::class, cascade: CascadeType::NONE)]
	public \ArrayObject $articles;

	function __construct() {
		$this->articles = new \ArrayObject();
	}

	private function getArticleIds() {
		$articles = array();
		foreach($this->articles as $article) {
			$articles[] = $article->basicJsonSerialize();
		}
		return $articles;
	}

	function basicJsonSerialize() {
		return [
				'id' => $this->id,
				'name' => $this->name
		];
	}

	function jsonSerialize(): mixed {

		$basicJson = $this->basicJsonSerialize();

		$basicJson['articles'] = $this->getArticleIds();

		return $basicJson;
	}
}