Using NHibernate Collection Filters with DDD Collections

I am trying to map a domain model to NHibernate. The domain model is implemented with what I consider to be DDD style. The mapping works mostly, but then when I try to use a collection filter on a collection, I get an exception that reads: no collection was found.

I know the problem has to do with how I implemented the collection. My question is, is it possible to use collection filters in nHibernate for collections implemented this way or should I just forget about it, i.e. NHibernate cannot work with this.

The code looks like this:

Person
{
   IList<Address> _addresses = new List<Address>();
   public string FirstName {get; set;}
   ...
   public void addAddress(Address address)
   {
      // ... do some checks or validation
      _addresses.Add(address);
   }

   public void removeAddress(Address address) {...}

   public ReadOnlyCollection<Address> Addresses 
   { 
      get { return new ReadOnlyCollection<Address>(_addresses); }
   }
}

      

        
        
        
      

    

The main problem is that I don't want to publicly post the collection of internal addresses. All that works I am using access.camelcase-underscore, so nHibernate interacts directly with the field. I worked in the book Hibernate in Action, now I'm in chapter 7 where it deals with collection filters.

Is there any way to get around this. I need to work by opening an internal collection like this:

public ReadOnlyCollection<Address> Addresses 
{ 
   get { return _addresses; }
}

      

        
        
        
      

    

but I really don't want to do that.

Help would be really appreciated.

Jide