Linq for NHibernate and fetch mode of eager loading

Question

Is there a way to set the fetchmode to eager for more than one object using linq for nhibernate. There seems to be an expand method which only allows me to set one object. However I need to set it for more than one object. Is this possible? Thanks

Answer 1

just use it more then once.

IList<Entity> GetDataFromDatabase()
{
    var query = session.Linq<Entity>();
    query.Expand("Property1");
    query.Expand("Property2");
    return query.ToList();
}

Answer 2

The new Linq provider does it a little differently:

var customers = session.Query<Customer>().Fetch(c => c.Orders).ToList();

More here: http://mikehadlow.blogspot.com/2010/08/nhibernate-linq-eager-fetching.html

Answer 3

As far as I can see, this is not equivalent: SetFetchMode hydrates an objects tree and the Expand method retrieves a cartesian product.

Answer 4

In contiune to @Mike Hadlow answer, fetching next level (grandchildren) you need to do:

var customers = session.Query<Customer>() .FetchMany(c => c.Orders) .ThenFetchMany(o => o.OrderLines).ToList();