public function UniqueFieldValueValidator::validate in Drupal 8

Same name and namespace in other branches

1. 9 core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/UniqueFieldValueValidator.php \Drupal\Core\Validation\Plugin\Validation\Constraint\UniqueFieldValueValidator::validate()

File

core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/UniqueFieldValueValidator.php, line 16

Class

UniqueFieldValueValidator

Validates that a field is unique for the given entity type.

Namespace

Drupal\Core\Validation\Plugin\Validation\Constraint

Code

public function validate($items, Constraint $constraint) {
  if (!($item = $items
    ->first())) {
    return;
  }
  $field_name = $items
    ->getFieldDefinition()
    ->getName();

  /** @var \Drupal\Core\Entity\EntityInterface $entity */
  $entity = $items
    ->getEntity();
  $entity_type_id = $entity
    ->getEntityTypeId();
  $id_key = $entity
    ->getEntityType()
    ->getKey('id');
  $query = \Drupal::entityQuery($entity_type_id);
  $entity_id = $entity
    ->id();

  // Using isset() instead of !empty() as 0 and '0' are valid ID values for
  // entity types using string IDs.
  if (isset($entity_id)) {
    $query
      ->condition($id_key, $entity_id, '<>');
  }
  $value_taken = (bool) $query
    ->condition($field_name, $item->value)
    ->range(0, 1)
    ->count()
    ->execute();
  if ($value_taken) {
    $this->context
      ->addViolation($constraint->message, [
      '%value' => $item->value,
      '@entity_type' => $entity
        ->getEntityType()
        ->getSingularLabel(),
      '@field_name' => mb_strtolower($items
        ->getFieldDefinition()
        ->getLabel()),
    ]);
  }
}