Lots of examples like order and order lines makes sense, like: Order is an AR that contains OrderLines Customer is an AR that contains Orders. Question is, what is the AR that contains Customer? ...

First of all, let me state that I am new to Command Query Responsibility Segregation and Event Sourcing (Message-Drive Architecture), but I'm already seeing some significant design benefits. Howeve...

I am using CqrsLite for a CQRS-style project. The Save method of the concrete Repository implementation looks like so (with irrelevant lines omitted). public void Save<T>(T aggregate, int? ...

Consider an aggregate with many properties. For example UserGroup. If I want to publish a UserGroupCreatedEvent I can do 2 things: duplicate the properties from the just created UserGroup to User...

In Domain-driven design if I want to use a repository I need to have an aggregate for it - as I understand. So I have a User, that has id, login, email, and password. A user is a domain Entity wi...

In "Domain Driven Design: Tackling Complexity in the Heart of Software", Evans defines An Aggregate is a cluster of associated objects that we treat as a unit for the purpose of data changes. ...

If I have a payment value object can it be shared by two different aggregate roots? or should I duplicate it? Both options feel wrong!

I am currently developing a DDD application and am confused about how to handle a scenario where it seems as if I have to access an aggregate root from another aggregate root. Here is an overview o...

I need to know about how to use shared value objects in DDD Eg? If i have two aggregates roots called Registration and Admission, both this aggregates consuming a value object called Address. even...

Take the domain proposed in Effective Aggregate Design of a Product which has multiple Releases. In this article, Vaughn arrives at the conclusion that both the Product and Release should each be t...

I am currently working through the domain driven design book by Eric Evans, and there is one concept that I am having trouble with... According to the book, all aggregates should have an aggregate...

We are using event sourcing and construct aggregates from stream of events. I have 2 aggregates - A1 and A2. A1 is used as a template in order to create A2. The size of A1 can be pretty big. The f...

In DDD the Aggregate should represent the transactional boundary. A transaction that requires the involvement of more than one aggregate is often a sign that either the model should be refined, or ...

Let's consider the typical Order and OrderItem example. Assuming that OrderItem is part of the Order Aggregate, it an only be added via Order. So, to add a new OrderItem to an Order, we have to loa...

Let's say I have two bounded contexts, the Shipping Context and the Billing Context. Each of these contexts need to know about the customer. At a data level, the customer is represented by a Custo...

How can we tell Entity Framework about Aggregates? when saving an aggregate, save entities within the aggregate when deleting an aggregate, delete entities within the aggregate raise a concurrenc...

What are aggregates and how are they used in CQRS (Command-Query-Responsibility-Segregation) and ES (Event-Sourcing)? I'm new to this kind of architecture, and I'd be really happy if someone could ...

I have an aggregate root Products which contains a list of entities Selection, which in turn contains a list of entities called Features. The aggregate root Product has an identity of just name T...

I'm having my first attempt at DDD and I'm running into a problem with aggregate design. My application contains 3 Entities; Graph, Node, Link. Each of these entities has a name property which can...

I am building an application using Domain Driven Design that is using Entity Framework. My goal is to allow my domain models (that get persisted with EF) contain some logic within them. Out of th...

I'm facing a key design question related to how to attach custom fields to entities in my system. The entities are represented in C# and persisted in RavenDB. We are roughly following tenants of Do...

I'm having some difficulty figuring out how the Aggregate Root will track changes on child entities. Let say I have an aggregate: Order (root) OrderLineItem With the Order class being the a...

Overall design: I have an aggregate class C that contains N member variables of type M_i, i = 1 ... N that each have a common write-only update() interface as well as class-specific read-only acces...

If you follow the repository pattern they... say to create a repository for each root aggregate entity. That means when I have this model: customer has orders order has products product has suppl...

I have a system where a user answers question in a form. I have objects representing this model but I am not quite sure how to organize these objects in terms of DDD. Form (has its own list of) ...