I can't avois this select N+1 - nhibernate

Question

I have this mapping ( it comes from adventureworks since I used it in a demo app for an automatic paging collection )
ModelMapper mapper = new ModelMapper(new SimpleModelInspector());
mapper.Class<Contact>(
k => {
k.Id(i => i.ContactID, m => m.Generator(Generators.Native));
k.Schema("Person");
}
);
mapper.Class<Employee>(
k =>
{
k.Id(i => i.EmployeeID, m => m.Generator(Generators.Native));
k.Schema("HumanResources");
k.ManyToOne(c => c.Contact, m => m.Column("ContactID"));
}
);
mapper.Class<SalesOrderHeader>(
k =>
{
k.Id(i => i.SalesOrderID,m=>m.Generator(Generators.Native));
k.Schema("Sales");
k.ManyToOne(c => c.SalesPerson, m => m.Column("SalesPersonID"));
k.ManyToOne(c => c.Contact, m => m.Column("ContactID"));
}
);
var map = mapper.CompileMappingForAllExplicitlyAddedEntities();
cfg.AddDeserializedMapping(map,string.Empty);
and the following ( limited ) query:
var list = NHHelper.Instance.CurrentSession.Query<SalesOrderHeader>()
.Fetch(k => k.Contact)
.Fetch(k => k.SalesPerson)
.Skip(first)
.Take(count)
.ToList();
I can't remove the select N+1 caused by employee-contact, how can I do ?
Consider mapping too can be changed !
EDIT: I add the working solution by #cremor
var list = NHHelper.Instance.CurrentSession.Query<SalesOrderHeader>()
.Fetch(k => k.Contact)
.Fetch(k => k.SalesPerson).ThenFetch(k=>k.Contact)
.Skip(first)
.Take(count)
.ToList();
this will avoid the problem.

Answer 1

Adding .ThenFetch(c => c.Contact) after .Fetch(k => k.SalesPerson) should also fetch the Contact of the Employee.