Which entities should be Aggregate Roots?

Posted by MylesRip on Stack Overflow See other posts from Stack Overflow or by MylesRip
Published on 2010-03-17T23:22:51Z Indexed on 2010/03/17 23:31 UTC
Read the original article Hit count: 176

Filed under:

domain-driven-design

If Book aggregates Chapter which in turn aggregates Page, then what should be the aggregate root? One possibility might be:

Book is an aggregate root with Chapter as a leaf and Chapter is an aggregate with Page as a leaf.

In this scenario, Chapter is a leaf in one aggregate and a root in another. Is this okay? Would it make sense in this scenario to have two repositories, one for Book and another for Chapter? If so, then couldn't the Chapter repository be used to circumvent the fact that access to Chapter should only happen via Book? What would be the best way to handle a situation like this?

Related posts about domain-driven-design

Learn Domain-Driven Design

as seen on Johnny Coder - Search for 'Johnny Coder'
I just wrote about how I like to present on unfamiliar topics. With this said, Domain-Driven Design (DDD) is no exception. This is yet another area I knew enough about to be dangerous but I certainly was no expert. As it turns out, researching this topic wasn’t easy. I could be wrong, but it… >>> More
Value vs Entity objects (Domain Driven Design)

as seen on Stack Overflow - Search for 'Stack Overflow'
I have just started reading DDD. I am unable to completely grasp the concept of Entity vs Value objects.. Can someone please explain the problems (maintainability, performance.. etc) a system could face when a Value object is designed as a Entity object. Example would be great... Thanks >>> More
Domain driven design: Manager and service

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm creating some business logic in the application but I'm not sure how or where to encapsulate it, I've used the repository pattern for data access, I've seen some projects that use DDD that have some classes with the "Service" suffix and the "manager" suffix, what are each of this clases suppose… >>> More
Refactoring in domain driven design

as seen on Programmers - Search for 'Programmers'
I've just started working on a project and we're using domain-driven design (as defined by Eric Evans in Domain-Driven Design: Tackling Complexity in the Heart of Software. I believe that our project is certainly a candidate for this design pattern as Evans describes it in his book. I'm struggling… >>> More
Service Oriented Architecture & Domain-Driven Design

as seen on Stack Overflow - Search for 'Stack Overflow'
I've always developed code in a SOA type of way. This year I've been trying to do more DDD but I keep getting the feeling that I'm not getting it. At work our systems are load balanced and designed not to have state. The architecture is: Website ===Physical Layer== Main Service ==Physical Layer== Server… >>> More

Developer IT