public async Task <IActionResult> PutBooksShelf(int id, BooksShelf booksshelf)
        {
            if (id != booksshelf.Id)
            {
                return(BadRequest());
            }

            _context.Entry(booksshelf).State = EntityState.Modified;

            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!BooksShelfExists(id))
                {
                    return(NotFound());
                }
                else
                {
                    throw;
                }
            }

            return(NoContent());
        }
        public async Task <ActionResult <BooksShelf> > PostBooksShelf(BooksShelf booksshelf)
        {
            _context.BooksShelfs.Add(booksshelf);
            await _context.SaveChangesAsync();

            return(CreatedAtAction(nameof(GetBooksShelf), new { id = booksshelf.Id }, booksshelf));

            // return CreatedAtAction("GetBook", new { id = book.Id }, book);
        }