PostRole.php

<?php

namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;
use ApiPlatform\Core\Annotation\ApiResource;
use App\Validator as CustomValidator;
/**
 * @ORM\Entity(repositoryClass="App\Repository\PostRepository")
 * @ApiResource(
 *     collectionOperations={"get", "post"},
 *     itemOperations={"get", "put"}
 * )
 */
class Post
{
    // Other properties
    
    /**
     * @ORM\Column(type="string", length=255)
     * 
     * Apply our constraint and pass the allowed Role
     * @CustomValidator\Role(role="ROLE_ADMIN")
     *
     */
    private $title;
    
     // Setters and Getters.