Cannot use NHibernate Code Mapping for a private field

Question

What is the equivalent NHibernate Code Mapping for the following Fluent NHibernate code:

Map(x => x.Orders).Access.CamelCaseField(Prefix.Underscore);
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Answer 1

You have a couple of options to map a non-visible field by code.

Here are some, please note that I haven't tested them yet as written, but should help you anyways:

// Option 1:
public class CustomerMap : ClassMapping
{
    public CustomerMap()
    {
        // ...

        Bag("_orders", collectionMapping =>
        {
            //...
        },
        map => map.ManyToMany(p => p.Column("OrderId")));
    }
}

// Option 2: No strings, but I'm not sure if this one would really work as is.
public class CustomerMap : ClassMapping
{
    public CustomerMap()
    {
        // ...

        Bag(x => x.Orders, collectionMapping =>
        {
            collectionMapping.Access(Accessor.Field),

            //...
        },
        map => map.ManyToMany(p => p.Column("OrderId")));
    }
}

// Option 3: No strings, but more convoluted.
public class Customer
{
    internal class PrivatePropertyAccessors
    {
        public static Expression>> OrdersProperty = c => c._orders;
    }

    private readonly IList _orders = new List();

    public IEnumerable Orders
    {
        get { foreach (var order in _orders) yield return order; }
    }
}

public class CustomerMap : ClassMapping
{
    public CustomerMap()
    {
        // ...

        Bag(Customer.PrivatePropertyAccessors.OrdersProperty, collectionMapping =>
        {
            //...
        },
        map => map.ManyToMany(p => p.Column("OrderId")));
    }
}