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<?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/>.
/**
* Course completion target.
*
* @package core_course
* @copyright 2019 Victor Deniz <victor@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace core_course\analytics\target;
defined('MOODLE_INTERNAL') || die();
require_once($CFG->dirroot . '/course/lib.php');
require_once($CFG->dirroot . '/lib/completionlib.php');
require_once($CFG->dirroot . '/completion/completion_completion.php');
/**
* Course completion target.
*
* @package core_course
* @copyright 2019 Victor Deniz <victor@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class course_completion extends course_enrolments {
/**
* Returns the name.
*
* If there is a corresponding '_help' string this will be shown as well.
*
* @return \lang_string
*/
public static function get_name() : \lang_string {
return new \lang_string('target:coursecompletion', 'course');
}
/**
* Returns descriptions for each of the values the target calculation can return.
*
* @return string[]
*/
protected static function classes_description() {
return array(
get_string('targetlabelstudentcompletionno', 'course'),
get_string('targetlabelstudentcompletionyes', 'course')
);
}
/**
* Discards courses that are not yet ready to be used for training or prediction.
*
* @param \core_analytics\analysable $course
* @param bool $fortraining
* @return true|string
*/
public function is_valid_analysable(\core_analytics\analysable $course, $fortraining = true) {
$isvalid = parent::is_valid_analysable($course, $fortraining);
if (is_string($isvalid)) {
return $isvalid;
}
// Not a valid target if completion is not enabled or there are not completion criteria defined.
$completion = new \completion_info($course->get_course_data());
if (!$completion->is_enabled() || !$completion->has_criteria()) {
return get_string('completionnotenabledforcourse', 'completion');
}
return true;
}
/**
* Course completion sets the target value.
*
* @param int $sampleid
* @param \core_analytics\analysable $course
* @param int $starttime
* @param int $endtime
* @return float|null 0 -> course not completed, 1 -> course completed
*/
protected function calculate_sample($sampleid, \core_analytics\analysable $course, $starttime = false, $endtime = false) {
if (!$this->enrolment_active_during_analysis_time($sampleid, $starttime, $endtime)) {
// We should not use this sample as the analysis results could be misleading.
return null;
}
$userenrol = $this->retrieve('user_enrolments', $sampleid);
// We use completion as a success metric.
$ccompletion = new \completion_completion(array('userid' => $userenrol->userid, 'course' => $course->get_id()));
if ($ccompletion->is_complete()) {
return 0;
} else {
return 1;
}
}
}