NHibernate JoinQueryOver query in Orchard - nhibernate

Question

I have an Orchard website. There are two connected entities: agencies (AgencyPartRecord ) and facilities (FacilityPartRecord), they are connected n-to-n with AgencyFacilitiesPartRecord. Here are the corresponding records:
public class AgencyPartRecord : ContentPartRecord
{
...
public virtual IList<AgencyFacilitiesPartRecord> AgencyFacilitiesPartRecords { get; set; }
...
}
public class AgencyFacilitiesPartRecord
{
public virtual int Id { get; set; }
public virtual AgencyPartRecord AgencyPartRecord { get; set; }
public virtual FacilityPartRecord FacilityPartRecord { get; set; }
}
public class FacilityPartRecord : ContentPartRecord
{
public virtual string Name { get; set; }
public virtual string Description { get; set; }
}
Now I need to filter out agencies by the set of facilities, so that only agencies having all the facilities in list should by selected.
In the end I want to get SQL like this:
SELECT *
FROM AgencyPartRecord
WHERE Id IN
(
SELECT a.AgencyPartRecord_Id
FROM AgencyFacilitiesPartRecord a
WHERE a.FacilityPartRecord_Id IN (... filter values here ...)
GROUP BY a.AgencyPartRecord
HAVING COUNT(a.Id) = <number of filter values>
)
I have written the following query (filter.Facilities is of type List<int>):
IQueryOver<AgencyPartRecord, AgencyPartRecord> agencies = ... // apply other filters
AgencyFacilitiesPartRecord facility = null;
var fsub = QueryOver.Of<AgencyFacilitiesPartRecord>(() => facility)
.WhereRestrictionOn(r => r.FacilityPartRecord.Id).IsIn(filter.Facilities)
.SelectList(list =>
list
.SelectGroup(a => a.AgencyPartRecord.Id)
.SelectCount(a => a.FacilityPartRecord.Id))
.Where(Restrictions.Eq(
Projections.Count(
Projections.Property(() => facility.FacilityPartRecord.Id)), filter.Facilities.Count))
.SelectList(list => list.Select(a => a.AgencyPartRecord.Id));
agencies = agencies
.WithSubquery.WhereProperty(a => a.Id).In(fsub);
The problem is this query does not produce GROUP BY clause in SQL:
SELECT ...
FROM AgencyPartRecord this_
WHERE ...
and this_.Id in
(
SELECT this_0_.AgencyPartRecord_id as y0_
FROM AgencyFacilitiesPartRecord this_0_
WHERE this_0_.FacilityPartRecord_id in (#p2, #p3)
HAVING count(this_0_.FacilityPartRecord_id) = #p4
)
What am I doing wrong?
Thanks!

Answer 1

I finally got it! :)
The right code is:
AgencyFacilitiesPartRecord facility = null;
var fsub = QueryOver.Of<AgencyFacilitiesPartRecord>(() => facility)
.WhereRestrictionOn(r => r.FacilityPartRecord.Id).IsIn(filter.Facilities)
.SelectList(list => list
.SelectGroup(r => r.AgencyPartRecord.Id)
)
.Where(Restrictions.Eq(
Projections.Count(Projections.Property(() => facility.FacilityPartRecord.Id)), filter.Facilities.Count));
agencies = agencies.WithSubquery.WhereProperty(a => a.Id).In(fsub);
Andrew, thanks again for your QueryOver series (http://blog.andrewawhitaker.com/queryover-series/)!