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);
}
}
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;
}
}
