NHibernate Query subquery group by join back to main entity - sql

Question

Hello i'm trying to achieve the following SQL
SELECT this_.*
FROM WorkItems this_
WHERE this_.UserId = (
SELECT this_1_.y0_ as y0_
FROM
(
SELECT top 1 this_0_.UserId as y0_, count(this_0_.UserId) as y1_
FROM WorkItems this_0_
WHERE this_0_.StateId = 1 and this_0_.Type like 'Data'
GROUP BY this_0_.UserId
ORDER BY y1_ desc
) this_1_
);
so far i have manged to produce something fairly close. I'm missing the part where i just select out the userId.
heres the query so far
var subquery = QueryOver.Of<WorkItem>().Where(w => w.State == state)
.AndRestrictionOn(w => w.Type).IsLike(type, MatchMode.Exact)
.SelectList(list =>
list.SelectGroup(w => w.UserId)
.WithAlias(() => resultAlias.userId)
.SelectCount(w => w.UserId)
.WithAlias(() => resultAlias.count))
.OrderByAlias(() => resultAlias.count)
.Desc().Take(1);
var query =
CurrentSession.QueryOver<WorkItem>()
.WithSubquery
.WhereProperty(p => p.UserId)
.Eq(subquery);

Answer 1

Try this: -
var subquery = QueryOver.Of<WorkItem>().Where(w => w.State == state)
.AndRestrictionOn(w => w.Type).IsLike(type, MatchMode.Exact)
.SelectList(list => list.SelectGroup(w => w.UserId))
.OrderBy(Projections.Count<WorkItem>(x => x.UserId))
.Desc().Take(1);
var query = CurrentSession.QueryOver<WorkItem>()
.WithSubquery
.WhereProperty(p => p.UserId)
.Eq(subquery);