DDD: entity's collection and repositories

Question

Suppose I have

public class Product: Entity
{
   public IList Items { get; set; }
}

Suppose I want to find an item with max someth

Answer 1

Remember that NHibernate is a mapper between the database and your objects. Your issue appears to me that your object model is not a viable relational model, and that's ok, but you need to embrace that.

Why not map another collection to your Product entity that uses the power of your relational model to load in an efficient manner. Am I right in assuming that the logic to select this special collection is not rocket science and could easily be implemented in filtered NHibernate mapped collection?

I know my answer has been vague, but I only understand your question in general terms. My point is that you will have problems if you treat your relational database in an object oriented manner. Tools like NHibernate exist to bridge the gap between them, not to treat them in the same way. Feel free to ask me to clarify any points I didn't make clear.