docs: private Entity<? extends Serializable> onAfterSave(
  			Entity<? extends Serializable> entity) {
  		Class<?> cls = entity.getClass();
  		if (Treeable.class.isAssignableFrom(cls)) {
  			Treeable self = (Treeable) entity;
  			if (notNull(self.getParent())) {
  				Treeable parent = (Treeable) getCurrentSession().get(cls,
  						self.getParent());
  				self.setPath(parent.getPath() + entity.getId().toString() + "/");
  				getCurrentSession().update(self);
  			}
  		}
  		return entity;
  	}