public async Task <Result <Unit> > Handle(Command request, CancellationToken cancellationToken)
{
var book = await _context.Books
.Include(a => a.Attendees).ThenInclude(u => u.AppUser)
.SingleOrDefaultAsync(x => x.Id == request.Id);
if (book == null)
{
return(null);
}
var user = await _context.Users.FirstOrDefaultAsync(x => x.UserName == _userAccessor.GetUsername());
if (user == null)
{
return(null);
}
var hostUsername = book.Attendees.FirstOrDefault(x => x.IsHost)?.AppUser?.UserName;
var attendance = book.Attendees.FirstOrDefault(x => x.AppUser.UserName == user.UserName);
if (attendance != null && hostUsername == user.UserName)
{
book.IsCancelled = !book.IsCancelled;
}
if (attendance != null && hostUsername != user.UserName)
{
book.Attendees.Remove(attendance);
}
if (attendance == null)
{
attendance = new BookAttendee
{
AppUser = user,
Book = book,
IsHost = false
};
book.Attendees.Add(attendance);
}
var result = await _context.SaveChangesAsync() > 0;
return(result ? Result <Unit> .Success(Unit.Value) : Result <Unit> .Failure("Problem updating attendance"));
}
public async Task <Result <Unit> > Handle(Command request, CancellationToken cancellationToken)
{
var user = await _context.Users.FirstOrDefaultAsync(x => x.UserName == _userAccessor.GetUsername());
var attendee = new BookAttendee
{
AppUser = user,
Book = request.Book,
IsHost = true
};
request.Book.Attendees.Add(attendee);
_context.Books.Add(request.Book);
var result = await _context.SaveChangesAsync() > 0;
if (!result)
{
return(Result <Unit> .Failure("Failed to create book"));
}
return(Result <Unit> .Success(Unit.Value));
}
