public BookService(
dbBooksContext _bookContext,
//BookMapper _mapper,
//DbContextOptions<dbBooksContext> _dbContextOptionns,
ILogger <BookService> _logger)
{
bookContext = _bookContext ?? throw new ArgumentNullException(nameof(bookContext));
//mapper = _mapper;
//dbContextOptions = _dbContextOptionns ?? throw new ArgumentNullException(nameof(dbContextOptions));
logger = _logger ?? throw new ArgumentNullException(nameof(logger));
}
private bool BookExists(dbBooksContext bookContext, long id) => bookContext.Books.Any(e => e.Id == id);