Question

I currently have this code.

                    tableB = new TableB
                    {
                        TableA = tableA,
                    };

                    List<TableC> tableC = locations.Select(location => new TableC
                    {
                        TableB = tableB
                    }).ToList();

                    tableB.TableC = tableC;

                    tableA.TableB.Add(tableB);
nhibernate.Create(a);
nhibernate.Commit();

The above code works but I find it kinda weird that I have do it like this.

I would like to do something like

  tableB = new TableB
                        {
                            TableA = tableA,
                            TableC = MakeAllTableCs()
                        };

                        tableA.TableB.Add(tableB);
    nhibernate.Create(a);
    nhibernate.Commit();

The collection of tableC’s is being made in memory and and when I try to do a create I get

not-null property references a null or transient value

It seems that it want’s a reference to TableB for each one in the collection of TableC. It seems kinda odd to do this seeing that I am sticking in the TableB object. I would have hoped that it would have figured that out and used it as a reference.

Is there anyway that I can do it so I don’t need to have a reference of TableB in each of my TableC objects?

Edit Mapping

     public class TableAMap : ClassMap<TableA>
        {
            public TableAMap()
            {

                Id(x => x.Id).GeneratedBy.GuidComb();
                HasMany(x => x.).Cascade.All().Inverse();
            }
        }


 public class TableBMap : ClassMap<TableB>
    {
        public TableBMap ()
        {

            Id(x => x.Id).GeneratedBy.GuidComb();
      References(x => x.TableA).Not.Nullable();
            HasMany(x => x.TableC).Cascade.All().Inverse();

        }

    }

  public class TableCMap : ClassMap<TableC>
    {
        public TableCMap ()
        {
            Id(x => x.Id).GeneratedBy.GuidComb();
           References(x => x.TableB).Not.Nullable();
        }
    }

Answer 1

Hard to say without your mappings and real NHibernate code (where you call session.Save()) but most likely you are not saving the new TableB objects and also don’t have any cascade setting on TableA.b (you need one of those).