I need to find the most recent report submitted by members of staff, using an NHibernate criteria query. I'm sure that I need to use projections, but I can't work out how to set it up.
A paraphrase of my domain model:
public class Employee
{
public int Id {get; set;}
public string Name {get; set;}
}
public class Report
{
public int Id {get; set;}
public DateTime? Submitted {get; set;}
public Employee Employee {get; set;}
// Other report properties omitted
}
If there were 5 members of staff, who each have 7 reports, the query should return 5 reports, one per employee, with the Submitted property being not null, and being most recent one for that employee .
I am not quite sure about this, but check it out:
var rst = session.CreateCriteria<Report>()
.SetProjection(Projections.GroupProperty("Employee"))
.SetProjection(Projections.Max("Submitted"))
.Add(NHibernate.Criterion.Expression.IsNotNull("Submitted")).List();
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