public ActionResult Index(int bookId, string category, string searchString, int resultsPerPage = 10, int page = 1)
{
var book = db.Books.Single(b => b.ID == bookId);
BookCard bc;
bool conflict = false;
//no one is reading it? borrow!
if (book.Reader == null)
{
bc = new BookCard
{
BookID = bookId,
BorrowDate = DateTime.Now,
Reader = User.Identity.Name
};
book.Reader = User.Identity.Name;
db.Cards.Add(bc);
db.Entry(book).State = EntityState.Modified;
}
//user is the reader? return!
else if (book.Reader == User.Identity.Name)
{
bc = db.Cards.Single(c => c.BookID == bookId && c.ReturnDate == null);
bc.ReturnDate = DateTime.Now;
book.Reader = null;
db.Entry(bc).State = EntityState.Modified;
db.Entry(book).State = EntityState.Modified;
}
else //this will probably only happen if the book was borrowed by someone else
//after the page was loaded but before the button click
{
conflict = true;
}
db.SaveChanges();
if (Request.IsAjaxRequest())
{
return(Content((HtmlHelpers.GetButton(bookId, book.Reader, User.Identity.Name, conflict)).ToHtmlString()));
}
var books = db.Books.Where(b => b.Status == true).ToList();
var model = BuildIndexViewModel(category, searchString, resultsPerPage, page, books);
return(View(model));
}