NHibernate PropertyRef fluent mapping

Question

Is there any way to make query over joins on different nullable foreign key?

Release notes: https://github.com/nhibernate/nhibernate-core/blob/5.2.4/releasenotes.txt#L103

• A collection mapped with a property-ref will no more support being accessed when the referenced property is null. It will throw. Previously, the collection was not throwing but was always loaded empty.

HasMany(m => m.SomeChildrenList).PropertyRef("Property"); => exception is thrown since Property can be null in database.

Answer 1

I think you're not using the correct syntax to describe your navigation property.

HasMany(m => m.SomeChildrenList).KeyColumn("Property");

Using .PropertyRef("...") throws an exception because there are no properties with this name in your entity class.