Fluent NHibernate - joined subclass ForeignKey Name - nhibernate

Question

I am looking at moving to Fluent NHibernate - the only issue I have encounter so far is that you can not specify a foreign key name on a joined sub class mapping.
Has anyone got a solution for this, or a workaround?
I found this post but the suggestion clearly was not added to the code.
I would like to avoid customising the code myself if possible.
Any help would be great...
Example:
public class Product
{
public string Name { get; set; }
}
public class Hammer : Product
{
public string Description { get; set; }
}
public class ProductMap : ClassMap<Product, long>
{
public ProductMap()
{
Polymorphism.Implicit();
Map(x => x.Name);
}
}
public class HammerMap : SubclassMap<Hammer>
{
public HammerMap()
{
Extends<Product>();
}
}
This generates something like:
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" default-access="field.camelcase-underscore" auto-import="false" default-cascade="none" default-lazy="true">
<class xmlns="urn:nhibernate-mapping-2.2" dynamic-insert="true" dynamic-update="true" mutable="true" polymorphism="implicit" optimistic-lock="version" name="Domain.Product, Domain" table="Product">
<id name="Id" type="System.Int64">
<column name="Id" />
<generator class="native">
<param name="sequence">ProductId</param>
</generator>
</id>
<property name="Name" type="System.String">
<column name="Name" />
</property>
<joined-subclass name="Domain.Hammer, Domain" table="Hammer">
<key>
<column name="Product_Id" />
</key>
<property name="Description" type="System.String">
<column name="Description" />
</property>
</joined-subclass>
</class>
</hibernate-mapping>
Note that there is no foreign key name specified in the mapping hbm file - as in:
<joined-subclass name="Domain.Hammer, Domain" table="Hammer">
<key column="Product_Id" foreign-key="FK_Hammer_Product"/>
</joined-subclass>

Answer 1

Try something like this
public class JoinedSubclassForeignKeyConvention : IJoinedSubclassConvention
{
public void Apply(IJoinedSubclassInstance instance)
{
instance.Key.ForeignKey(string.Format("FK_{0}_{1}",
instance.EntityType.Name, instance.Type.Name));
}
}