Nextras\Orm\Entity\IEntity::getProperty PHP Method

    public function getProperty($name);

 protected function updateRelationshipRemove(IEntity $entity)
 {
     if (!$this->metadata->relationship->property) {
         return;
     }
     $this->updatingReverseRelationship = true;
     $entity->getProperty($this->metadata->relationship->property)->setInjectedValue(null);
     $this->updatingReverseRelationship = false;
 }