Question

I am trying to apply conditions on foreign key of customer entity i.e Orders, I want to load only the orders whose IsCancelFlag is false.(The result will be of type customer i.e Customer object, and it conatins a set of Order objects) But while iterating through the returned results, I can see all the orders under the customer, irrespective of whether its cancelled or not. Is it possible to apply conditions on foreign key in nhibernate

        ICriteria _criteria= session.CreateCriteria<Customer>();
        _criteria.Add(Expression.Eq("CustomerId", 12));
        _criteria.CreateAlias("FKorders","FKorders");
        _criteria.Add(Expression.Eq("FKorders.IsCancelFlag", false));
        return _criteria.UniqueResult<Customer>();

Answer 1

your Property names seems weired but maybe you want

var query =
    from c in session.Query<Customer>()
    from o in c.Orders
    where o.IsCanceled
    select new { Customer = c, Order = o }

var results = query.AsEnumerable()
    .ToLookup(a => a.Customer, a => a.Order);

this will return a ILookup<Customer, Orders>. NHibernate won’t return a Customer with partially initialised Orders since this will be a broken model and change tracking would be broken.