You actually are using NULLS in a IDENTIFIER column?
I'd rethink your data structure honestly, this does not sound right at all.
On Thu, Mar 15, 2012 at 2:55 PM, Szymon Ząbkiewicz
<sz.zabkiew...@gmail.com>wrote:
> Hi!
> I have a situation where I have a table with 3 columns which contain
> IDs referencing defferent tables. In addition to those 3 columns I
> have a few columns with some properties.
>
> Let's say that the 3 columns are Foo, Bar, Baz. Foo is never null, and
> exactly one of Bar, Baz is null.
>
> My entity and mapping looks like this (please keep in mind that I
> wanted to keep things simple):
>
> public class FooBarBaz
> {
> public virtual Foo Foo { get; set; }
> public virtual Bar Bar { get; set; }
> public virtual Baz Baz { get; set; }
> public virtual string Prop { get; set; }
>
> public override bool Equals(Object obj)
> {
> /* checks for nulls etc. in the end
> returns Foo == obj.Foo && Bar == obj.Bar && Baz == obj.Baz */
> }
>
> public override int GetHashCode()
> {
> /* builds unique string for (Foo,Bar,Baz)
> taking nulls into account and gets it's hashcode */
> }
> }
>
> public class FooBarBazMap : ClassMap<FooBarBaz>
> {
> public FooBarBazMap()
> {
> CompositeId()
> .KeyReference(x => x.Foo, "Foo_Id")
> .KeyReference(x => x.Bar, "Bar_Id")
> .KeyReference(x => x.Baz, "Baz_Id");
> Map(x => x.Prop);
> }
> }
>
> I created manually a row where all three columns are not null, and
> this mapping works totally fine. But my application logic is based on
> the fact that always one of the two (Bar, Baz) is null and in that
> situation NHibernate returns null as FooBarBaz entity.
>
> How can I overcome this problem? Does NHibernate allow null values in
> CompositeId?
>
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