public void LendBook(ObjectId userId, ObjectId bookId, DateTime startDateUtc, DateTime endDateUtc)
{
// Check if dates are logical.
if (startDateUtc > endDateUtc)
{
return;
}
// Check if lending time is not exceeding maximum.
var lendTime = endDateUtc.Subtract(startDateUtc);
if (lendTime.TotalDays > _maximumLendingTimeInDays)
{
return;
}
// Check if book exists.
if (_database.FindOneById <Book>(Book.CollectionName, bookId) == null)
{
return;
}
// Check if book is currently lent out.
if (GetCurrentLendingBook(bookId) != null)
{
return;
}
// Create a new lending.
var lending = new Lending(userId, bookId, startDateUtc, endDateUtc);
_database.Create(lending, Lending.CollectionName);
}
public ActionResult Details(string id)
{
var objectId = new ObjectId(id);
var book = _database.FindOneById <Book>(Book.CollectionName, objectId);
return(View(new BookViewModel {
Id = book.Id.ToString(), Author = book.Author, Title = book.Title
}));
}
// TODO: return position.
public void CreateReservation(ObjectId userId, ObjectId bookId)
{
// Check if book exists.
if (_database.FindOneById <Book>(Book.CollectionName, bookId) == null)
{
return;
}
// Check for active lending.
var lending = _lendService.GetCurrentLendingBook(bookId);
if (lending == null)
{
// Book can be lend, so no need to create reservation.
// TODO: Maybe return useful message?
return;
}
var reservation = new Reservation(userId, bookId, DateTime.UtcNow);
_database.Create(reservation, Reservation.CollectionName);
}