nhibernate queryover how to select an alias column? - nhibernate

Question

Assuming I have three simple tables
schedule
{
Student student { get; set;}
Teacher teacher { get; set;}
bool Deleted { get; set; }
}
Student
{
string Name { get; set; }
IList<schedule> TeacherMeetings {get; set; }
}
and assume teacher has the same thing, name and list of student schedules.
I want to select, from schedule, the list of all student names for a particular teacher. I can write the query for conditions and everything, but having trouble selecting just the student names.
Here is my current query:
DetachedCriteria dc = QueryOver.Of<Schedule>(() => sAlias)
.JoinAlias(() => sAlias.student, () => studentAlias)
.JoinAlias(() => sAlias.teacher, () => teacherAlias)
.Where(() => teacherAlias.MembershipGuid == teacherGuid)
.AndNot(() => sAlias.isDeleted)
//.Select(() => studentAlias.Name)
.SelectList(list => list
.SelectGroup(x => x.student.Name).WithAlias(() => studentAlias.Name))
.DetachedCriteria
;
If I comment out all select, profiler shows the query being generated as the right one, with right joins on right tables, only, it selects all columns on all tables.
I can't seem to get the select right, I only need the student.Name only.
How do I write this please? I've been at this for over an hour trying out different things but it is always the select that errors out, saying NHibernate.QueryException: could not resolve property and that studentName isn't recognizable.
thanks.

Answer 1

If you just want a list of strings, you shouldn't need to use WithAlias. WithAlias is used to project that column into a member on a result object.
Something like this should work:
DetachedCriteria dc = QueryOver.Of<Schedule>(() => sAlias)
.JoinAlias(() => sAlias.student, () => studentAlias)
.JoinAlias(() => sAlias.teacher, () => teacherAlias)
.Where(() => teacherAlias.MembershipGuid == teacherGuid)
.AndNot(() => sAlias.isDeleted)
.SelectList(list => list
.Select(() => studentAlias.Name))
.DetachedCriteria;
So the following should get you a list of strings:
IList<string> names = dc.GetExecutableCriteria(session)
.List<string>();
Update (per comment). Here's how you would order by student name, descending:
DetachedCriteria dc = QueryOver.Of<Schedule>(() => sAlias)
.JoinAlias(() => sAlias.student, () => studentAlias)
.JoinAlias(() => sAlias.teacher, () => teacherAlias)
.Where(() => teacherAlias.MembershipGuid == teacherGuid)
.AndNot(() => sAlias.isDeleted)
.SelectList(list => list
.Select(() => studentAlias.Name))
.OrderBy(() => studentAlias.Name).Desc()
.DetachedCriteria;