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

    protected function isValidCode()
    {
        $parent = $this->parent;
        if (!$parent) {
            return true;
        }
        $find = $parent->getChildren()->where(["code" => $this->code, 'pid' => $this->pid]);
        if (!$this->isNewRecord) {
            $find->andWhere(["!=", 'id', $this->id]);
        }
        if ($find->one()) {
            return false;
        }
        return true;
    }