wont save to database with guid as id- fluent-nhiberate

Question

i got problems with saving when i use Guid as identifier. can anybody se what i am missing here? i create my own guid so i dont want it to be generated by database.

NOTE: i have tried the guid.combo in mapping to without any success.

public class Order
{
    public virtual Guid Id { get; set; }
    public virtual ICollection<OrderItem> OrderItems { get; set; }
    public virtual User User { get; set; }
    public virtual DateTime? CreateDate { get; set; }
    public virtual DateTime? ShippedDate { get; set; }
    public virtual string OrderStatus { get; set; }

    public Order()
    {
        OrderItems = new Collection<OrderItem>();
    }

    public virtual void AddOrderItems(OrderItem orderItem)
    {
        orderItem.Order = this;
        OrderItems.Add(orderItem);
    }
}

OrderMap:

public OrderMap()
    {
        Id(x => x.Id).ColumnName("Id").GeneratedBy.Guid();

        Map(x => x.CreateDate);
        Map(x => x.ShippedDate);
        Map(x => x.OrderStatus);

        References(x => x.User);
        HasMany(x => x.OrderItems).Cascade.All().Inverse().LazyLoad();
    } 

Answer 1

Id(x => x.Id).ColumnName("Id").GeneratedBy.Assigned()

Also .WithUnsavedValue(Guid.Empty) might be needed but I'm not sure. You'll probably need to tell NHibernate to use Save or Update (not SaveOrUpdate) each time, anyway. Not a big expert here... but you need to use .Assigned() for sure.