public async Task <int> Update(BookItemDto entity)
        {
            var book = await _context.BookItems.FindAsync(entity);

            this._context.Entry(book).CurrentValues.SetValues(entity);
            return(1);
        }
        public async Task <IActionResult> PutBookItem(int id, BookItemDto bookItemDto)
        {
            if (id != bookItemDto.Id)
            {
                return(BadRequest());
            }
            await this._mediator.Send(new UpdateBookCommand(bookItemDto));

            return(NoContent());
        }
        public async Task <int> Add(BookItemDto entity)
        {
            await _context.BookItems.AddAsync(entity);

            return(1);
        }
        public async Task <ActionResult <BookItemDto> > PostBookItem(BookItemDto bookItemDto)
        {
            await this._mediator.Send(new AddBookCommand(bookItemDto));

            return(Ok(new BookItemDto()));
        }