Cascade Saves with Fluent NHibernate AutoMapping

Question

How do I "turn on" cascading saves using AutoMap Persistence Model with Fluent NHibernate?

As in:

I Save the Person and the Arm should also be saved. Currently I get

"object references an unsaved transient instance - save the transient instance before flushing"

public class Person : DomainEntity
{
  public virtual Arm LeftArm { get; set; }
}

public class Arm : DomainEntity
{
  public virtual int Size { get; set; }
}

I found an article on this topic, but it seems to be outdated.

Answer 1

You can also make cascading the default convention for all types. For example (using the article you linked to as a starting point):

autoMappings.WithConvention(c =>  
  {  
    // our conventions
    c.OneToOneConvention = o => o.Cascade.All();
    c.OneToManyConvention = o => o.Cascade.All();
    c.ManyToOneConvention = o => o.Cascade.All();
  });

Answer 2

This works with the new configuration bits. For more information, see http://wiki.fluentnhibernate.org/show/ConvertingToNewStyleConventions

//hanging off of AutoPersistenceModel    
.ConventionDiscovery.AddFromAssemblyOf<CascadeAll>()


public class CascadeAll : IHasOneConvention, IHasManyConvention, IReferenceConvention
{
    public bool Accept( IOneToOnePart target )
    {
        return true;
    }

    public void Apply( IOneToOnePart target )
    {
        target.Cascade.All();
    }

    public bool Accept( IOneToManyPart target )
    {
        return true;
    }

    public void Apply( IOneToManyPart target )
    {
        target.Cascade.All();
    }

    public bool Accept( IManyToOnePart target )
    {
        return true;
    }

    public void Apply( IManyToOnePart target )
    {
        target.Cascade.All();
    }
}

Answer 3

The Convention Method Signatures have changed. For the new answer that does exactly what this question asks see THIS QUESTION.

Answer 4

Updated for use with the the current version:

public class CascadeAll : IHasOneConvention, IHasManyConvention, IReferenceConvention
{
    public void Apply(IOneToOneInstance instance)
    {
        instance.Cascade.All();
    }

    public void Apply(IOneToManyCollectionInstance instance)
    {
        instance.Cascade.All();
    }

    public void Apply(IManyToOneInstance instance)
    {
        instance.Cascade.All();
    }
}