Help with QueryOver and WhereExists

Question

I have a problem. I have Persons and Cats. Each Person has some Cats (there is a foreign key in Cats that points to the primary key in Persons). Each Cat has an Age. I want to s

Answer 1

Example taken from this page and adapted (tested with my own classes):

The trick seems to be using an alias.

Person personAlias = null;

IList persons = 
        session.QueryOver(() => personAlias).WithSubquery
          .WhereExists(QueryOver.Of()
             .Where(c => c.Age > 5)
             .And(c => c.Owner.Id == personAlias.Id)
             .Select(c => c.Owner))
          .List();