ajax_mentors_students.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * @package    block_fn_mentor
 * @copyright  Michael Gardener <mgardener@cissq.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

define('AJAX_SCRIPT', true);

require_once('../../config.php');
require_once('lib.php');
require_once($CFG->dirroot.'/blocks/fn_mentor/filters/lib.php');

$action   = optional_param('action', false, PARAM_TEXT);
$mentorid = optional_param('mentorid', 0, PARAM_INT);
$groupid = optional_param('groupid', 0, PARAM_INT);
$filter   = optional_param('filter', '', PARAM_TEXT);
$sessionfilter   = optional_param('sessionfilter', false, PARAM_BOOL);

$PAGE->set_context(context_system::instance());

confirm_sesskey();

require_login(null, false);
$records = null;
$data = array();
$selectoptions = array();

$idfield = array(
    'all_users' => 'id',
    'all_mentors' => 'id',
    'mentors_without_mentee' => 'id',
    'mentors_without_groups' => 'id',
    'all_students' => 'id',
    'all_mentees' => 'id',
    'students_without_mentor' => 'id',
    'mentees_without_mentor' => 'id',
    'get_mentees' => 'studentid',
    'get_group_mentees' => 'studentid'
);

// PERMISSION.
if ( has_capability('block/fn_mentor:assignmentor', context_system::instance(), $USER->id)) {

    switch ($action) {
        case 'all_users':
            $records = block_fn_mentor_get_all_users($filter);
            break;
        case 'all_mentors':
            $records = block_fn_mentor_get_all_mentors($filter);
            break;

        case 'mentors_without_mentee':
            $records = block_fn_mentor_get_mentors_without_mentee($filter);
            break;

        case 'mentors_without_groups':
            $records = block_fn_mentor_get_mentors_without_groups($filter);
            break;

        case 'all_mentees':
            $records = block_fn_mentor_get_all_students($filter, false, $sessionfilter);
            break;

        case 'mentees_without_mentor':
            $records = block_fn_mentor_get_students_without_mentor($filter);
            break;

        case 'get_mentees':
            $records = block_fn_mentor_get_mentees($mentorid, 0, '', 0, $sessionfilter);
            break;

        case 'get_group_mentees':
            $records = block_fn_mentor_get_group_mentees($mentorid, $groupid);
            break;
    }

    if ($records) {
        $i = 0;
        foreach ($records as $record) {
            $i++;
            $selectoptions[$i]['id'] = $record->{$idfield[$action]};
            $selectoptions[$i]['label'] = $record->firstname.' '.$record->lastname;
        }
        $data['success'] = true;
        $data['message'] = '';
    } else {
        $data['success'] = true;
        $data['message'] = get_string('not_found', 'block_fn_mentor');
    }

} else {
    $data['success'] = false;
    $data['message'] = get_string('permission_error', 'block_fn_mentor');
}

$data['options'] = $selectoptions;

echo json_encode($data);