public function __construct(PageRepo $pageRepo, BookRepo $bookRepo, ChapterRepo $chapterRepo, ExportService $exportService, UserRepo $userRepo)
{
$this->pageRepo = $pageRepo;
$this->bookRepo = $bookRepo;
$this->chapterRepo = $chapterRepo;
$this->exportService = $exportService;
$this->userRepo = $userRepo;
parent::__construct();
}