private void UpdateLentBooks(LibraryDataContext dataContext, DB.Lending currentEntity, Model.Lending modifiedEntity)
{
DB.Employee currentEmployee = GetCurrentEmployee(dataContext);
var newListOfBooks = modifiedEntity.Books.ToList();
foreach (DB.LentBook book in currentEntity.Books.ToList())
{
newListOfBooks.RemoveFirst(x => x.Id == book.Id);
Model.LentBook newBook = modifiedEntity.Books.FirstOrDefault(x => x.Id == book.Id);
if (newBook == null) //removed
{
currentEntity.Books.Remove(book);
dataContext.LentBooks.Remove(book);
}
else //modified
{
UpdateSingleLentBook(book, newBook, currentEmployee);
}
}
//add new LentBooks
foreach (Model.LentBook book in newListOfBooks)
{
DB.LentBook toAdd = Mapper.Map <DB.LentBook>(book);
toAdd.Lending = currentEntity;
toAdd.ReturnEmployee = (book.ReturnDate != null) ? currentEmployee : null;
currentEntity.Books.Add(toAdd);
}
}
protected DB.Employee GetCurrentEmployee(LibraryDataContext dataContext)
{
DB.Employee emp = dataContext.Persons.OfType <DB.Employee>().FirstOrDefault(e => e.Username == _username);
if (emp == null)
{
throw new AccessException();
}
else
{
return(emp);
}
}
public void ReturnBooks(Dictionary <int, bool> bookIds, int lendingId)
{
if (bookIds == null)
{
throw new ArgumentNullException("bookIds");
}
DateTime returnDate = DateTime.Now;
using (var dataContext = GetDataContext())
{
DB.Employee currentEmployee = GetCurrentEmployee(dataContext);
//set ReturnDate and ReturnEmployee according to argument
dataContext.LentBooks
.Where(x => bookIds.Keys.Contains(x.Id))
.ForEach(lent =>
{
if (bookIds[lent.Id])
{
lent.ReturnDate = returnDate;
lent.ReturnEmployee = currentEmployee;
}
else
{
lent.ReturnDate = null;
lent.ReturnEmployee = null;
}
});
//if all books returned, set ReturnDate of whole Lending
var lending = dataContext.Lendings.FirstOrDefault(l => l.Id == lendingId);
if (lending == null)
{
throw new RecordNotFoundException();
}
if (lending.Books.All(x => x.ReturnDate.HasValue))
{
lending.ReturnDate = returnDate;
}
else
{
lending.ReturnDate = null;
}
dataContext.SaveChanges();
}
}
private void UpdateSingleLentBook(DB.LentBook dbEntity, Model.LentBook modelEntity, DB.Employee currentEmployee)
{
dbEntity.EndDate = modelEntity.EndDate;
dbEntity.ReturnDate = modelEntity.ReturnDate;
if (modelEntity.ReturnDate.HasValue)
{
if (modelEntity.ReturnEmployeeId != null)
{
dbEntity.ReturnEmployeeId = modelEntity.ReturnEmployeeId;
}
else
{
dbEntity.ReturnEmployee = currentEmployee;
}
}
else
{
dbEntity.ReturnEmployee = null;
}
}