$context = get_context_instance(CONTEXT_COURSE, $params["enc_course_id"]);
$adminUsers = get_users_by_capability($context, 'mod/voiceboard:presenter');
$allUsers = get_users_by_capability($context, 'moodle/course:view');
//$users also contain the users which have this capabilities at the system level
$students = array_diff_assoc($allUsers, $adminUsers);
//we get the student by getting the diff of the two arrays
$users_key = array_keys($students);
$vtAction = new vtAction($session->getEmail(), $params);
$resource = $vtAction->getResource($resource_id);
if ($resource === false) {
//problem to get the grade
redirection($redirectionUrl . '&error=problem_vt');
}
$options = $resource->getOptions();
$isAverageMethodAvailable = true;
$arrayAverageLength = $vtAction->getAverageMessageLengthPerUser($resource_id);
if ($arrayAverageLength == "not_implemented") {
$isAverageMethodAvailable = false;
}
$arrayNbMessage = $vtAction->getNbMessagePerUser($resource_id);
$urlParams = 'resource_id=' . $resource_id . '&type=board&id=' . $params["enc_course_id"] . '&' . voiceboard_get_url_params($params["enc_course_id"]) . '&time=' . $session->timeOfLoad;
$previousGrade = grade_get_grades($params["enc_course_id"], "mod", "voiceboard", $params["gradeId"], $users_key);
if (!empty($previousGrade) && isset($previousGrade->items[0])) {
//extract only the grade information from the object that we get
//we take the items 0 because we ask only for one grade item
$previousGrade = $previousGrade->items[0]->grades;
}
?>
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