public bool Add(Book book) { var bookId = _bookRepository.Add(new BookDto() { Name = book.Name, Description = book.Description, ReleaseDate = book.ReleaseDate, Image = book.Image }); var isBookAdded = _goodRepository.AddGood(new GoodDto() { BookId = bookId, Count = book.Count, Price = book.Price }); _authorRepository.DeleteBookAuthorByBookId(bookId); _genreRepository.DeleteBookGenreByBookId(bookId); book.AuthorIds.ForEach(authorId => { _authorRepository.AddBookAuthor(new BookAuthorDto() { BookId = bookId, AuthorId = authorId }); }); book.GenreIds.ForEach(genreId => { _genreRepository.AddBookGenre(new BookGenreDto() { BookId = bookId, GenreId = genreId }); }); return(isBookAdded); }