Mapping one source class to multiple derived classes with automapper

Question

Suppose i have a source class:

public class Source
{
    //Several properties that can be mapped to DerivedBase and its subclasses
}

And some d

Answer 1

Include derived mappings into base mapping:

Mapper.CreateMap()
    .ForMember(d => d.Id, op => op.MapFrom(s => s.Id)) // you can remove this
    .Include()
    .Include();

Mapper.CreateMap()
    .ForMember(d => d.Name, op => op.MapFrom(s => s.Text))
    .ForMember(d => d.Value2, op => op.MapFrom(s => s.Amount));

Mapper.CreateMap()
    .ForMember(d => d.Value, op => op.MapFrom(s => s.Amount));

Usage:

Mapper.AssertConfigurationIsValid();
var s = new Source() { Id = 2, Amount = 10M, Text = "foo" };
var d1 = Mapper.Map(s);
var d2 = Mapper.Map(s);

See Mapping inheritance on AutoMapper wiki.

---

UPDATE: Here is full code of classes which works as it should.

public class Source
{
    public int Id { get; set; }
    public string Text { get; set; }
    public decimal Amount { get; set; }
}

public class DestinationBase
{
    public int Id { get; set; }
}

public class DestinationDerived1 : DestinationBase
{
    public string Name { get; set; }
    public decimal Value2 { get; set; }
}

public class DestinationDerived2 : DestinationBase
{
    public decimal Value { get; set; }
}

---

UPDATE (workaround of AutoMapper bug):

public static class Extensions
{
    public static IMappingExpression MapBase(
        this IMappingExpression mapping)
        where TDestination: DestinationBase
    {
        // all base class mappings goes here
        return mapping.ForMember(d => d.Test3, e => e.MapFrom(s => s.Test));
    }
}

And all mappings:

    Mapper.CreateMap()
          .Include()
          .Include()
          .MapBase();

    Mapper.CreateMap()
          .MapBase()
          .ForMember(d => d.Test4, e => e.MapFrom(s => s.Test2));

    Mapper.CreateMap()
          .MapBase()
          .ForMember(d => d.Test5, e => e.MapFrom(s => s.Test2));