getExistingCmsBlocks example

private readonly EntityRepository $cmsBlockRepository,
        private readonly AbstractBlockTemplateLoader $blockTemplateLoader,
    ) {
    }

    public function updateCmsBlocks(
        CmsExtensions $cmsExtensions,
        string $appId,
        string $defaultLocale,
        Context $context
    ): void {
        $existingCmsBlocks = $this->getExistingCmsBlocks($appId, $context);

        $cmsBlocks = $cmsExtensions->getBlocks() !== null ? $cmsExtensions->getBlocks()->getBlocks() : [];
        $upserts = [];
        foreach ($cmsBlocks as $cmsBlock) {
            $payload = $cmsBlock->toEntityArray($appId, $defaultLocale);

            $template = $this->blockTemplateLoader->getTemplateForBlock($cmsExtensions, $cmsBlock->getName());

            $payload['template'] = $template;
            $payload['styles'] = $this->blockTemplateLoader->getStylesForBlock($cmsExtensions, $cmsBlock->getName());