skeeks\cms\models\Tree::getDescendants PHP Method

    public function getDescendants()
    {
        $pidsAll = implode("/", $this->pids) . "/" . $this->id . "/%";
        $expression = new Expression("`pids` LIKE '{$pidsAll}'");
        $query = static::find()->andWhere(['or', $expression, ['pid' => $this->id]])->orderBy(["level" => SORT_ASC, "priority" => SORT_ASC]);
        //$query->primaryModel = $this;
        $query->multiple = true;
        return $query;
    }