public static function add_competency_to_course($courseid, $competencyid) {
        static::require_enabled();
        // Check the user have access to the course.
        self::validate_course($courseid);

        // First we do a permissions check.
        $context = context_course::instance($courseid);

        require_capability('moodle/competency:coursecompetencymanage', $context);

        $record = new stdClass();
        $record->courseid = $courseid;
        $record->competencyid = $competencyid;

        $competency = new competency($competencyid);

        // Can not add a competency that belong to a hidden framework.
        if ($competency->get_framework()->get('visible') == false) {
            throw new coding_exception('A competency belonging to hidden framework can not be linked to course');
        }

        $coursecompetency = new course_competency();
        $exists = $coursecompetency->get_records(array('courseid' => $courseid, 'competencyid' => $competencyid));
        if (!$exists) {
            $coursecompetency->from_record($record);
            if ($coursecompetency->create()) {
                return true;
            }
        }
        return false;
    }