CAllGradeBook::LessonIdByGradeBookId

static function LessonIdByGradeBookId ($certId)
{
	$rc = CGradeBook::GetByID($certId);
	if ($rc === false)
		throw new LearnException('', LearnException::EXC_ERR_ALL_GIVEUP);

	$row = $rc->Fetch();

	if ( ! isset($row['LINKED_LESSON_ID']) )
		throw new LearnException('', LearnException::EXC_ERR_ALL_GIVEUP);

	return ( (int) $row['LINKED_LESSON_ID'] );
}