A series of simple Aggregate Root questions (Domain Driven Design)

Posted by Robert on Stack Overflow See other posts from Stack Overflow or by Robert
Published on 2010-05-17T09:49:35Z Indexed on 2010/05/20 5:10 UTC
Read the original article Hit count: 281

Filed under:

aggregate

|

root

|

ddd

I have a few (hopefully) simple questions about aggregate roots in domain driven design:

Is it okay to have an aggregate root as a property of another aggregate root?
Is it okay to have a given entity inside two or more aggregate roots?

My final question is a bit more involved. I have a website that has a few entities that really belong to a "website" aggregate root. They are 'News', 'Products', and 'Users'. There isn't a 'Website' table in the database, but a 'Website' seems like a good aggregate root for these three entities. How is this usually achieved?

Thanks!

© Stack Overflow or respective owner

Related posts about aggregate

Error in running script [closed]

as seen on Programmers - Search for 'Programmers'
I'm trying to run heathusf_v1.1.0.tar.gz found here I installed tcsh to make build_heathusf work. But, when I run ./build_heathusf, I get the following (I'm running that on a Fedora Linux system from Terminal): $ ./build_heathusf Compiling programs to build a library of image processing functions… >>> More
Semi-complex aggregate select statement confusion

as seen on Stack Overflow - Search for 'Stack Overflow'
Alright, this problem is a little complicated, so bear with me. I have a table full of data. One of the table columns is an EntryDate. There can be multiple entries per day. However, I want to select all rows that are the latest entry on their respective days, and I want to select all the columns… >>> More
Simple LINQ Aggregate Query

as seen on Stack Overflow - Search for 'Stack Overflow'
What is the vb.net equivalent of the following psuedo-code using LINQ? select min(credits) minCredits, max(credits) maxCredits, min(dollars) minDollars, max(dollars) maxDollars from players minCredits_lbl.Text = minCredits ... maxDollars_lbl.Text = maxDollars I have the following, but… >>> More
How to aggregate over few types with linq?

as seen on Stack Overflow - Search for 'Stack Overflow'
Can someone help me translate the following to one liner: Dim items As New List(Of Object) For Each c In ph.Contacts items.Add(New With {.Type = "Contact", .Id = c.ContactId, .Title = c.Title}) Next For Each c In ph.Persons items.Add(New With {.Type = "Person", .Id = c.PersonId, .Title =… >>> More
ORM Persistence by Reachability violates Aggregate Root Boundaries?

as seen on Stack Overflow - Search for 'Stack Overflow'
Most common ORMs implement persistence by reachability, either as the default object graph change tracking mechanism or an optional. Persistence by reachability means the ORM will check the aggregate roots object graph and determines wether any objects are (also indirectly) reachable that are not… >>> More

Related posts about root

High CPU usage with Team Speak 3.0.0-rc2

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
The CPU usage is always around 40 percent. I use push-to-talk and I had uninstalled pulseaudio. Now I use Alsa. I don't even have to connect to a Server. By simply starting TS the cpu usage goes up 40 percent and stays there. The CPU usage of 3.0.0-rc1 [Build: 14468] is constantly 14 percent. This… >>> More
How to mount a blu-ray drive?

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
Maybe it is for the best to close this question. This has nothing to do with a bluray drive in general anymore. Probably a hardware defect. I will try to test it with a windows system and different cables again... Thx so far. I have a bluray/dvd/cdrom drive with SATA. Ubuntu wont find it under /dev/sd wodim… >>> More
Problems installing Memcache (PECL extension)

as seen on Server Fault - Search for 'Server Fault'
I have installed memcached fine, and now I will need to install PECL extension memcache. Im running RedHat x86_64 es5. The installation gives me this: downloading memcache-2.2.6.tgz ... Starting to download memcache-2.2.6.tgz (35,957 bytes) ..........done: 35,957 bytes 11 source files, building running:… >>> More
High Linux loads on low CPU/memory usage

as seen on Server Fault - Search for 'Server Fault'
Hi. I have quite strange situation, where my CentOS 5.5 box loads are high, but the CPU and memory used are pretty low: top - 20:41:38 up 42 days, 6:14, 2 users, load average: 19.79, 21.25, 18.87 Tasks: 254 total, 1 running, 253 sleeping, 0 stopped, 0 zombie Cpu(s): 3.8%us, 0.3%sy, 0… >>> More
Ubuntu: Move fsbackup backups to Amazon S3

as seen on Server Fault - Search for 'Server Fault'
I have a legacy server (Ubuntu 9.10 Karmic x86), where previous admin set up backups with fsbackup. This server lives in a VPS (under some kind of Xen), and it is low on HDD space (16 GB total). Now it came to a point, where fsbackup backups take more space than the rest of data in the system. The… >>> More