public function getAuthors($blog)
    {
        $recordSet = $this->repo->findAuthorsByBlog($blog);
        $authorsIds = [];
        foreach ($recordSet as $value) {
            $authorsIds[] = $value['id'];
        }
        $authors = $this->userRepo->findBy(['id' => $authorsIds], ['lastName' => 'ASC']);
        $serializedAuthors = [];
        foreach ($authors as $author) {
            $serializedAuthors[] = $this->userSerializer->serialize($author, [Options::SERIALIZE_MINIMAL]);
        }

        return $serializedAuthors;
    }