EntityTestUuidId.php

<?php

declare (strict_types=1);
namespace Drupal\entity_test\Entity;

use Drupal\Component\Uuid\UuidInterface;
use Drupal\Core\Entity\Attribute\ContentEntityType;
use Drupal\Core\Entity\Routing\DefaultHtmlRouteProvider;
use Drupal\Core\Field\BaseFieldDefinition;
use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\entity_test\EntityTestAccessControlHandler;
use Drupal\entity_test\EntityTestForm;

/**
 * Defines a test entity class with UUIDs as IDs.
 */
class EntityTestUuidId extends EntityTest {
  
  /**
   * {@inheritdoc}
   */
  public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
    $fields = parent::baseFieldDefinitions($entity_type);
    // Configure a string field to match the UUID field configuration and use it
    // for both the ID and the UUID key. The UUID field type cannot be used
    // because it would add a unique key to the data table.
    $fields[$entity_type->getKey('uuid')] = BaseFieldDefinition::create('string')->setLabel(new TranslatableMarkup('UUID'))
      ->setSetting('max_length', 128)
      ->setSetting('is_ascii', TRUE)
      ->setDefaultValueCallback(static::class . '::generateUuid');
    return $fields;
  }
  
  /**
   * Statically generates a UUID.
   *
   * @return string
   *   A newly generated UUID.
   */
  public static function generateUuid() : string {
    $uuid = \Drupal::service('uuid');
    assert($uuid instanceof UuidInterface);
    return $uuid->generate();
  }

}