How do I use Fluent NHibernate to configure the following joins? - fluent-nhibernate

Question

This is based on a legacy system.
I have the following tables:
CREATE TABLE a
id int
CREATE TABLE b
a_id int,
c_id int
relationshipid int -- must be IN (1, 2, 3)
CREATE TABLE c
id int
I want the following domain models
public class A
{
public int Id { get; set; }
public C entityc { get ; set; }
}
public class C
{
public int Id { get; set; }
}
Table b is set up so that for a particular defined relationshipid there is (well, should only be) one pair of ids. For other relationships, that one to one mapping through B doesn't hold true. Relationshipid can be one of a small number of values.
How do I get entity C into class A from the relationship where the relationshipid is 1 using fluent NHIbernate?
As a side question, is there a name for what I am trying to do here? The original approach was trying use a HasOne with a Join table and Filter the results, but obviously that failed miserably.
EDIT: Clarified RelationshipID and purpose.

Answer 1

I think the easiest way to map this would be to make your table b an entity and have references to both A and C within that entity and RelationshipId as the id. So your mappings would look something like this:
public class A
{
public int Id { get; set; }
public IList<B> bEntities { get; set; }
}
public class ClassAMap : ClassMap<A>
{
public AMap()
{
Table("A");
Id(x => x.Id);
HasMany(x => x.bEntities)
.KeyColumns.Add("a_id");
}
}
public class B
{
public virtual int RelationshipId { get; set; }
public virtual A InstanceA { get; set; }
public virtual C InstanceC { get; set; }
}
public class ClassBMap : ClassMap<B>
{
public BMap()
{
Table("B");
Id(x => x.RelationshipId , "relationshipid");
References(x => x.InstanceA);
References(x => x.InstanceC);
}
}
Edit:
If your wanting to filter these results for the collection of B entities in your A entity to only ones matching RelationshipId = 1 then you should take a look at this post:
Fluent NHibernate and filtering one-to-many relationship on query requiring multiple joins?
You could also do something like this in your class A:
public class A
{
public int Id { get; set; }
public IList<B> bEntities { get; set; }
public C InstanceC
{
get { return bEntities.First<B>(x => x.RelationshipId == 1).InstanceC; }
}
}