Question

we have keyreference in composite id like below

table(“parent”);
compositeid()
.keyreference(e=>Obj,”sample”);

this generates separate queries for obj for each row in parent. How to solve this problem ?
Mainly how to control fetch startegies(inner join) here for keyreference ?

Please help

Answer 1

you can tweak the keyreferencemapping. the easiest would be to disable lazyloading

.KeyReference(e => e.Obj, c => c.Not.Lazy());

it will however use a select instead of join. But using a query NH uses a join

var loaded = session.Query<Parent>()
    .Fetch(c => c.Obj)
    .ToList();

Note: it seems that Linq does eager fetch while QueryOver doesn’t. this does not work

var loaded = session.QueryOver<Parent>()
    .Fetch(c => c.Obj).Eager
    .List();