/**
* Fetches Batch Id of a Student,
* Member_id must be set before calling this function
* @return int the Batch_id of student
*/
public function fetchBatchId()
{
$member_id = $this->getMember_id(true);
$student_class_object = new Acad_Model_StudentClass();
$student_class_object->setMember_id($member_id);
$batch_identifier_class_id = $student_class_object->fetchBatchIdentifierClassId();
$class_object = new Acad_Model_Class();
$class_object->setClass_id($batch_identifier_class_id);
$class_object->fetchInfo();
$batch_id = $class_object->getBatch_id();
return $batch_id;
}