Do DDD and SOA really play well together?

Question

Please let me know, ever so gently, if I am totally mangling the DDD concept, but here is my dilemma.

Let\'s say I have the following domain model:

Teach         


        

Answer 1

You are thinking about performance, but you will be surprised. In my SOA web services I use such complete object graphs and performance is well within acceptable limits. I would suggest to use business objects and business web methods like SaveTeacher(Teacher t) unless absolutely required to use DTOs for performance reason and associated CRUD web methods like AddStudent(long teacherId, Student student)
But even if using the later you can apply the DDD concept by loading the teacher from your persistence store given the teacherId, attaching the student and saving the teacher back to persistence store.