prepareMediaDataForSaving example

        $params['displayDate'] = $params['displayDate'] . ' ' . $params['displayTime'];

        if (!$params['shopIds']) {
            $params['shopIds'] = null;
        }

        $this->prepareTagAssociatedData($params, $blogModel);
        $params = $this->prepareAssignedArticlesAssociatedData($params);
        $params = $this->prepareAuthorAssociatedData($params);

        unset($params['tags']);
        $params['media'] = $this->prepareMediaDataForSaving($params['media']);

        $blogModel->fromArray($params);

        try {
            $this->getManager()->persist($blogModel);
            $this->getManager()->flush();

            $repository = $this->getManager()->getRepository(Blog::class);

            $filter = [['property' => 'id', 'value' => $blogModel->getId()]];
            $dataQuery = $repository->getBackendDetailQuery($filter);