prepareMainVariantData example

if (!$detail) {
            $detail = new Detail();
            $detail->setKind(1);
            $detail->setArticle($article);
            $article->setMainDetail($detail);
        }

        if (empty($data['mainDetail'])) {
            $data['mainDetail'] = [];
        }

        $data['mainDetail'] = $this->getVariantResource()->prepareMainVariantData($data['mainDetail'], $article, $detail);

        return $data;
    }

    /** * Short method to completely generate all images from a product, main images and variant images * * @param bool $force Force all images to be regenerated * * @see Article::generateMainThumbnails * @see Article::generateVariantImages */