def post(self): """Post method to allow addition of book""" add_book_args = add_book_parser.parse_args() book_title = add_book_args['book_title'].strip().title() authors = add_book_args['authors'].strip().title() year = add_book_args['year'].strip() edition = add_book_args['edition'] city_published = add_book_args['city_published'].strip().title() book_isnb = add_book_args['book_isnb'].strip() publisher = add_book_args['publisher'].strip().title() copies = add_book_args['copies'] available_by_isnb = Book.query.filter_by(book_isnb=book_isnb).first() available_by_author_title = Book.query.filter_by( book_title=book_title, authors=authors).first() if available_by_isnb: return { "message": "This book's id is {}. Please update it.".format( available_by_isnb.book_id) }, 409 if available_by_author_title: return { "message": "This book's is {}. Please update it.".format( available_by_author_title.book_id) }, 409 new_book = Book(book_id=random.randint(1111, 9999), book_title=book_title, authors=authors, edition=edition, city_published=city_published, book_isnb=book_isnb, publisher=publisher, year=year, copies=copies) new_book.save_book() return { "message": "The book was added successfully.", "book_added": new_book.book_serializer() }, 201