Question

What is the correct translation of this LINQ to SQL query in NHibernate using the Criteria API?

var result = from e in Employees
    where e.WorkTimeEntries.Any(t => t.DateTime >= new DateTime(2012, 3, 1))
    select e;

I have tried:

var employees       = Session.QueryOver<Employee>();
var timeWorkedAlias = new HashedSet<WorkTimeEntry>();
var timeWorked      = employees.Left.JoinQueryOver(e => e.WorkTimes,
                                                        () => timeWorkedAlias);
timeWorkedAlias.Where (wa => wa.DateTime >= new DateTime(2012,3,1));
// How do to include the timeWorkedAlias 'filter' in the  query?

var result = employees.List();

I am missing a couple of steps to include the date filter to be included in the query.

Answer 1

I think I manage to find the answer (with help from Andre)

This seems to work:

var result = Session.QueryOver<Employee>()
 .JoinQueryOver<WorkTimeEntry>(e => e.WorkTimes)
 .Where(t => t.DateTime > new DateTime(2012,3,1))
 .List();

The trick is to specify JoinQueryOver<WorkTimeEntry>

According to QueryOver in NH 3.0

Note, the overload for JoinQueryOver takes an IEnumerable, and the
C# compiler infers the type from that. If your collection type is not
IEnumerable, then you need to qualify the type of the sub-criteria: