Map a column multiple times - nhibernate

Question

I have a rather odd requirement in my fluent hibernate maps. I have an table(A) which has a compound foreign key relationship with another table(B). In the mapping for table A I would like to have both the object created from table B and access to the individual attributes of A which define the key. Is there any way to do that? I seem to get index out of range exceptions if I map the column twice.
I cannot just explore B for the attributes because the row in table B may not exist. I am painfully aware that there are some significant smells in the structure with which I'm dealing. Such is the fate of those who deal with legacy systems.

Answer 1

It's kinda possible, by hacking around a little.
We're going to define a domain that with a fake collection that we'll use to retrieve the single related element, if found:
public class Foo
{
public virtual BarKey BarKey { get; set; }
public virtual Bar Bar { get { return Bars.SingleOrDefault(); } }
protected virtual ICollection<Bar> Bars { get; set; }
}
public class Bar
{
public virtual BarKey Id { get; set; }
}
//this class must override Equals and GetHashcode. Implementation not shown.
public class BarKey
{
public virtual int X { get; set; }
public virtual int Y { get; set; }
}
The BarKey component contains the properties that are part of the key.
Now, the mapping:
<class name="Foo">
<id ...><generator .../></id>
<component name="BarKey">
<property name="X" />
<property name="Y" />
</component>
<bag name="Bars" inverse="true">
<key property-ref="BarKey">
<column name="X"/>
<column name="Y"/>
</key>
<one-to-many class="Bar"/>
</bag>
</class>
<class name="Bar">
<composite-id name="Id">
<key-property name="X" />
<key-property name="Y" />
</composite-id>
</class>
The property-ref attribute there tells NH to match those columns in Bar against the BarKey property of Foo instead of its Id.