Fluent-Nhibernate References and PropertyRef Doing a Select With Lazy Load

Question

I am using PropertyRef for one of my References properties. With LazyLoad() it still does a Select and loads the User ent

Answer 1

Has to do with property-ref see NHibernate creates proxy via session.Load(), but not via Linq or Criteria API

And not that you asked, but also consider that many-to-one with proxy does not allow you to do type-checking if you subclass User, see http://ayende.com/Blog/archive/2010/01/28/nhibernate-new-feature-no-proxy-associations.aspx

Answer 2

I don't think this is a bug in NHibernate. It depends on your mapping.

First, remember that the reference map will join the key (primary key and foreign key) between 2 mapping tables. To prevent SELECT + 1, just ignore the key joint.

References(x => x.SalesPerson)
                    .LazyLoad()
                    .PropertyRef(x => x.Username)
                    WithForeignKeyName("none") //disable key join.