Fluent Nhibernate Many to Many Mapping Way - fluent-nhibernate

Question

I have two classes Order and Items
I want a method like this
class Order
{
public virtual IList<Item> GetItems(Order order)
{
//get items for that order.
}
}
class Item
{
public virtual IList<Order> GetOrders(Item item)
{
//get all the orders in which that items is present.
}
}
Is it write to create a method like this or instead should I create a property
public virtual IList<Item> Items { get; set; }
And how should I do the mapping for this is nhibernate??

Answer 1

Apparently you have a many-to-many relationship: An order can have many items and an item can belong to many orders. In a relational database you need to express this with a separate table which I presume you have - let's assume this table is called OrdersItems.
Following the Store/Product example from the Fluent NHibernate documentation you would create an Items property in an Order and an Orders property in Item:
class Order
{
public virtual IList<Item> Items { get; protected set; }
}
class Item
{
public virtual IList<Order> Orders { get; protected set; }
}
And the mappings:
public class OrderMap : ClassMap<Order>
{
public OrderMap()
{
HasManyToMany(x => x.Items)
.Cascade.All()
.Table("OrdersItems");
}
}
public class ItemMap : ClassMap<Item>
{
public ItemMap()
{
HasManyToMany(x => x.Orders)
.Cascade.All()
.Inverse()
.Table("OrdersItems");
}
}