Question

I have two entities:

public class Order:Entity
{
   public virtual User User { get; set; }
   ...
}

public class User:Entity
{
   public virtual ICollection<Order> Orders { get; set; }
   ...
}

Next, I create order:

var order = _orderService.CreateTransientOrder(orderNumbers, PcpSession.CurrentUser);
PcpSession.Order = order;

this is CreateTransientOrder. It’s only create Order, but not save into database:

public Order CreateTransientOrder(string orderNumbers, User currentUser)
{
   ...fill fields
   order.User = currentUser;
   return order;
}

Now it’s all ok. Next, I save order to the database:

_orderService.CreateOrder(PcpSession.Order);

This is CreateOrder:

public void CreateOrder(Order order)
{
    order.OrderDate = DateTime.Now;
    _repository.Save(order);
    _repository.SaveChanges();
}

This is my Save method of repository:

public void Save<T>(T entity) where T : class, IEntity
{
    _context.Set<T>().Add(entity);
}

When the SaveChanges is called in the database creates new user with new ID and order have new User_Id. In the debugger in the CreateOrder method, Id is equal current user. Where is a problem?
Thanks.

Answer 1

User is probably not being tracked by the context. When you add order to the context it also adds the related entities and then on save changes creates a new user (or attempts to). Attach() the user to the context before you call _context.Set<T>().Add(entity);.