/**
* Delete an instructor class instance assignment
*
* @param object $record One record of import data
* @param string $filename The import file name, used for logging
* @param string $idnumber The idnumber of the class instance
*
* @return boolean true on success, otherwise false
* @uses $CFG
* @uses $DB
*/
function class_enrolment_delete_instructor($record, $filename, $idnumber)
{
global $CFG, $DB;
require_once $CFG->dirroot . '/local/elisprogram/lib/setup.php';
require_once elispm::lib('data/pmclass.class.php');
require_once elispm::lib('data/instructor.class.php');
require_once elispm::lib('data/user.class.php');
if (!($crsid = $DB->get_field(pmclass::TABLE, 'id', array('idnumber' => $idnumber)))) {
$this->fslogger->log_failure("instance value of \"{$idnumber}\" does not refer to a valid instance of a class context.", 0, $filename, $this->linenumber, $record, "enrolment");
return false;
}
$userid = $this->get_userid_from_record($record, $filename);
// string to describe the user
$user_descriptor = $this->get_user_descriptor($record, false, 'user_');
if (!$DB->record_exists(instructor::TABLE, array('classid' => $crsid, 'userid' => $userid))) {
$this->fslogger->log_failure("User with {$user_descriptor} is not enrolled in " . "class instance \"{$idnumber}\" as instructor.", 0, $filename, $this->linenumber, $record, "enrolment");
return false;
}
if (!$this->validate_class_enrolment_data('delete', $record, $filename)) {
return false;
}
// obtain the cluster / userset id
$classid = $DB->get_field(pmclass::TABLE, 'id', array('idnumber' => $idnumber));
// delete the association
$studentid = $DB->get_field(instructor::TABLE, 'id', array('userid' => $userid, 'classid' => $classid));
$instructor = new instructor($studentid);
$instructor->load();
$instructor->delete();
// log success
$success_message = "User with {$user_descriptor} successfully unenrolled from class instance \"{$idnumber}\" as an instructor.";
$this->fslogger->log_success($success_message, 0, $filename, $this->linenumber);
return true;
}