Storm\Core\Object\IEntityProperty::IsOptional PHP Метод

    public function IsOptional();

 public function __construct(Object\IEntityProperty $EntityProperty, Relational\IToOneRelation $ToOneRelation)
 {
     if ($EntityProperty->IsOptional()) {
         throw MappingException::OptionalEntityInLazyContext($ToOneRelation);
     }
     parent::__construct($EntityProperty, $ToOneRelation);
 }