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@PostMapping("/add")
    public String add(@ModelAttribute("book")Book book, HttpServletRequest request){
        bookService.addBookWithAuthor(book, request.getParameter("author_name"), request.getParameter("author_years"));
        return "redirect:/home";
    }

@Override
    public void addBookWithAuthor(Book book, String author_name, String author_years) {
        Author author = new Author();
        author.setName(author_name);
        author.setYears(author_years);
        authorDao.saveAuthor(author);
        book.setAuthor(author);
        bookDao.addBook(book);
    }