如何在LINQ中将两个查询联合到流畅的NHibernate？

Question

How to Union two Queries in LINQ to Fluent NHibernate?

They return the same type but the queries are over separate entities:

IQueryable<Event> eventQuery1 = session.Query<Event>().Where(e => e.EventType.Id == eventTypeId);

IQueryable<Event> eventQuery2 = session.Query<Nomination>().Select(n => n.Event).Distinct();

I tried the Union() and Concat() methods but they failed:

eventQuery1 = eventQuery1.Union(eventQuery2);

The UnionResultOperator result operator is not current supported

I don't want to load the objects from database then apply the concat, I'd like it to be done before the objects are returned from database so that I can apply some Fetches on the final list from the union.

Answer 1

Not sure if it works with NHibernate LINQ, but a work-around is:

IQueryable<Event> eventQuery =
     session.Query<Event>()
            .Where(e => e.EventType.Id == eventTypeId
                     || session.Query<Nomination>()
                               .Select(n => n.Event.Id)
                               .Contains(e.Id))