public function delStudentsFromClassDetail($classId, $classDetailId, $studentIds)
{
try {
$tId = session('instId');
//students
$students = explode('|', $studentIds);
$class = new \Home\Model\ClassModel();
$class->startTrans();
//save students that join this class
for ($i; $i < count($students); $i++) {
$class->delClassDetailAndStudentRela($classDetailId, $students[$i], $tId);
}
$class->commit();
} catch (Exception $e) {
$class->rollback();
}
}
