NHibernate: HasMany Components and Where / Contains Position

I am trying to figure out how to create a query using Linq in NHibernate.

I have two classes:

public class Foo
{
    private ISet<Bar> _bars = new HashedSet<Bar>();
    public virtual ISet<Bar> Bars
    {
        get { return _bars; }
        set { _bars = value; }
    }
}

public class Bar
{
    public string Name { get; set; }
    public string Color { get; set; }
}

      

        
        
        
      

    

The Foo Bar collection appears as a set of one-to-many components.

Now I want to run a query that should look something like this:

var myBar = new Bar { Name = "test", Color = "testColor" };

var matchingFoos = Session.Linq<Foo>
                   .Where(foo => foo.Bars.Contains(myBar),
                          new BarEqualityComparer())
                   .ToList();

      

        
        
        
      

    

I'm not sure if this is correct, but whenever I run this request, I get a NullReferenceException inside the NHibernate.Linq.Visitors.WhereArgumentsVisitor.GetCollectionContainsCriteria method.

Can anyone help me with an alternative way to run this query?