UniqueBirthLogConstraintValidator.php in farmOS 2.x

Namespace

Drupal\farm_birth\Plugin\Validation\Constraint

File

modules/log/birth/src/Plugin/Validation/Constraint/UniqueBirthLogConstraintValidator.php

<?php

namespace Drupal\farm_birth\Plugin\Validation\Constraint;

use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;

/**
 * Validates the UniqueBirthLog constraint.
 */
class UniqueBirthLogConstraintValidator extends ConstraintValidator implements ContainerInjectionInterface {

  /**
   * The entity type manager.
   *
   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
   */
  protected $entityTypeManager;

  /**
   * Constructs a UniqueBirthLogConstraintValidator object.
   *
   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
   *   The entity type manager.
   */
  public function __construct(EntityTypeManagerInterface $entity_type_manager) {
    $this->entityTypeManager = $entity_type_manager;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container
      ->get('entity_type.manager'));
  }

  /**
   * {@inheritdoc}
   */
  public function validate($value, Constraint $constraint) {

    /** @var \Drupal\Core\Field\EntityReferenceFieldItemList $value */

    /** @var \Drupal\farm_birth\Plugin\Validation\Constraint\UniqueBirthLogConstraint $constraint */

    // Only continue if this is a birth log.

    /** @var \Drupal\log\Entity\LogInterface $log */
    $log = $value
      ->getParent()
      ->getValue();
    if (!empty($log) && $log
      ->bundle() != 'birth') {
      return;
    }

    // Iterate through referenced entities.
    foreach ($value
      ->referencedEntities() as $delta => $asset) {

      // If the log is not new, skip validation.
      // A birth log exits so there is no need to check if one can be created.

      /** @var \Drupal\log\Entity\LogInterface $log */
      $log = $value
        ->getParent()
        ->getValue();
      if (!$log
        ->isNew()) {
        return;
      }

      // Query the number of birth logs that reference the asset.
      // We do not check access to ensure that all matching logs are found.
      $count = $this->entityTypeManager
        ->getStorage('log')
        ->getAggregateQuery()
        ->accessCheck(FALSE)
        ->condition('type', 'birth')
        ->condition('asset', $asset
        ->id())
        ->count()
        ->execute();

      // If more than 0 birth logs reference the asset, add a violation.
      if ($count > 0) {
        $this->context
          ->buildViolation($constraint->message, [
          '%child' => $asset
            ->label(),
        ])
          ->atPath((string) $delta . '.target_id')
          ->setInvalidValue($asset
          ->id())
          ->addViolation();
      }
    }
  }

}

Classes

Name	Description
UniqueBirthLogConstraintValidator	Validates the UniqueBirthLog constraint.