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

    public function getRoot()
    {
        $tableName = $this->tableName();
        $id = $this->getParentsIds();
        if ($id && is_array($id)) {
            $id = $id[0];
        }
        $query = $this->find()->andWhere(["{$tableName}.[[" . $this->primaryKey()[0] . "]]" => $id]);
        $query->multiple = false;
        return $query;
    }