public function setCategoryId($categoryId)
    {
        $categoryId = (int) $categoryId;

        if ($this->categoryId < 0) {
            throw new \UnderflowException('Value of "categoryId" must be greater than 0');
        }


        if ($this->exists() && $this->categoryId !== $categoryId) {
            $this->updated['categoryId'] = true;
        }

        $this->categoryId = $categoryId;

        return $this;
    }