Given the classes:

public class Person
{
    public string Name { get; set; }
}

public class Student : Person
{
    public int StudentId { get; set; }
}

public class Source
{
    public Person Person { get; set; }
}

public class Dest
{
    public string PersonName { get; set; }
    public int? PersonStudentId { get; set; }
}

I want to use Automapper to map Source -> Dest.

This test obviously fails:

Mapper.CreateMap<Source, Dest>();
var source = new Source() { Person = new Student(){ Name = "J", StudentId = 5 }};

var dest = Mapper.Map<Source, Dest>(source);
Assert.AreEqual(5, dest.PersonStudentId);

What would be the best approach to mapping this given that "Person" is actually a heavily used data-type throughout our domain model.