Neomerx\JsonApi\Schema\RelationshipObject::getData PHP Метод

    public function getData()
    {
        if ($this->isDataEvaluated === false) {
            $this->isDataEvaluated = true;
            if ($this->data instanceof Closure) {
                /** @var Closure $data */
                $data = $this->data;
                $this->data = $data();
            }
        }
        return $this->data;
    }