3 namespace Drupal\Core\Validation\Plugin\Validation\Constraint;
5 use Symfony\Component\Validator\Constraint;
8 * Checks if an entity field has a unique value.
12 * label = @Translation("Unique field constraint", context = "Validation"),
15 class UniqueFieldConstraint extends Constraint {
17 public $message = 'A @entity_type with @field_name %value already exists.';
22 public function validatedBy() {
23 return '\Drupal\Core\Validation\Plugin\Validation\Constraint\UniqueFieldValueValidator';