farm-2.x-dev/modules/asset/group/src/Plugin/Validation/Constraint/CircularGroupMembershipConstraint.php
modules/asset/group/src/Plugin/Validation/Constraint/CircularGroupMembershipConstraint.php
<?php namespace Drupal\farm_group\Plugin\Validation\Constraint; use Symfony\Component\Validator\Constraint; /** * Checks that a log is not creating a circular group membership. * * @Constraint( * id = "CircularGroupMembership", * label = @Translation("Circular group membership", context = "Validation"), * ) */ class CircularGroupMembershipConstraint extends Constraint { /** * The default violation message. * * @var string */ public $message = '%asset cannot be a member of itself.'; }