public function getJson() {
        return [
            'id' => $this->id,
            'groupId' => $this->groupId,
            'itemLabel' => $this->itemLabel,
            'itemQuantity' => $this->itemQuantity,
            'priceModifier' => $this->priceModifier,
            'position' => $this->position,
            'createdAt' => $this->createdAt,
            'updatedAt' => $this->updatedAt,
        ];
    }