Comments on: Strengthening your domain: a primer

By: bogardj

bogardj — Mon, 29 Mar 2010 12:20:34 +0000

@Matt

Check out this post from Greg Young:

http://codebetter.com/blogs/gregyoung/archive/2009/05/22/always-valid.aspx

By: Matt Slay

Matt Slay — Sat, 27 Mar 2010 12:36:28 +0000

I followed eveything except all the mentions about “invariants”. You never defined what that is or gave a link to learn more about.

By: Andriy Buday

Andriy Buday — Sat, 06 Feb 2010 16:18:57 +0000

I have following questions:

1) In .NET world how should I indicate Aggregate Roots in my solutions? Should this be Modules (folders, namespaces) or it should be something else?

2) And what if my functionality need to work with one table but it has two points of view on this table. For one point of view it should be “Visit” entity and for other it looks like “Appointment” entity (data scope is bit different). Should I have one Entity with whole bulk of data or should I have two entities with two Aggregate roots and if yes… how should I be save with this?

By: bogardj

bogardj — Thu, 04 Feb 2010 20:09:16 +0000

@Bill

It’s not that the code is unclear, it’s that it doesn’t tell the whole story. It tells us “what” but not “why”. Not only that, but if you have 80 entities, but 5 of them are critically important, they’re never sorted in order of criticality in my IDE. It’s just alphabetical.

I’m all for self-documenting code, but it’s not a manual.

By: Bill Sorensen

Bill Sorensen — Thu, 04 Feb 2010 19:02:00 +0000

“The last true DDD system I handed off to another team, they would have been at a loss if I just gave them software to look at.”

Isn’t that a potential area of concern? If you’re doing the simplest thing that could possibly work and programming by intention, why is the code unclear?

By: Sean Gough

Sean Gough — Thu, 04 Feb 2010 14:26:38 +0000

Great post, really looking forward to the next few!