Object Relational Mapping (ORM) using NHibernate - Part 7 of 8 Completing the Ecommerce Example

using System;
using System.Collections.Generic;
using System.Linq;

namespace ECommerceSystem.Domain
{

    public class ShoppingCartSelection
    {
        public ShoppingCartSelection()
        {
            ShoppingCartSelectionId = new CompositeKey();
        }
        public ShoppingCartSelection(ProductDescription product, ShoppingCart cart,int quantity)
        {
            ShoppingCartSelectionId = new CompositeKey();
            //Set the composite keys
            ShoppingCartSelectionId.class1Key = product.ProductDescriptionId;
            ShoppingCartSelectionId.class2Key = cart.ShoppingCartId;
            //Set the associations
            product.CartSelectionsWithThisProduct.Add(this);
            cart.CartSelections.Add(this);
            CurrentProduct = product;
            ParentCart = cart;
            //SetProperty
            Quantity = quantity;
        }
        public virtual CompositeKey ShoppingCartSelectionId { get; set; }

        public virtual ProductDescription CurrentProduct { get; set; }
        
        public virtual ShoppingCart ParentCart { get; set; }

        public virtual int Quantity { get; set; }

    }
}