As I understand, there is a 1-1 relation between a Repository and a AggregationRoot. Suppose I have an AggregationRoot_A with an attribute holding an id for an AggregationRoot_B. I will have Reposi...

Here is a quote from Mockito unit testing framework: Don't mock value objects Why one would even want to do that? Because instantiating the object is too painful !? => not a valid reason...

Should Use Cases or Application Services have interfaces and implementations when following a hexagonal architecture with ddd principles? For example, the use case "delete a video", shoul...

I am trying to implement domain driven design in my project. Here is my base Aggregate class: public abstract class UUIDAggregate { private final DomainEventPublisher domainEventPublisher; prot...

I am running into an issue with proper architecture when using gRPC. In a traditional DDD approach, the core project (i.e. innermost layer / domain layer) has no references to the outside layer and...

I have an issue that I am not sure how to solve when DDD is assumed and using C#/EF Core. Simplified situation: We have 2 aggregates - Item and Warehouse. Each of them has its identity by External...

How do I persist value objects in Entity Framework without polluting my domain model? EF (well, relational DBs in general) require me to define a key - which my value objects don't have out of the ...

Domain events are well known in DDD, which can be published in Aggregate Roots or in Domain Services. My question here is, Can domain events be published in application services/use cases? For exam...

I am using EF Core/.NET Core 2.1, and following DDD. I need to implement an audit log of all changes to my entities, and have done so using code from this blog post (relevant code from this post in...

I'm looking for an advice related to the proper way of implementing a rollback feature in a CQRS/event-sourcing application. This application allows to a group of editors to edit and update some ed...

Let's use the classic example of blog context. In our domain we have the following scenarios: Users can write Posts. Posts must be cataloged at least in one Category. Posts can be described using T...

I'm a little bit confused. I just watched Julie Lerman's Pluralsight video on DDD and here's the confusion I have: Having a simple online store example with: Purchase Orders with Items for Supplier...

I'm trying to use Domain Driven Design (DDD) in a Python project, but it looks like a lot of boilerplate code. I think I'm on the wrong path. I've three files, all defining the item for each...

I am writing an application that I wish to follow the DDD patterns, a typical entity class looks like this: @Entity @Table(name = "mydomain_persons") class Person { @Id @GeneratedValue(strategy...

Building a time tracking application I am trying to determine the best way to design the aggregate roots. The basic core entities are Client, Project, Employee, ProjectAssignment, Department, Time...

I have this entity: public int Id { get; private set; } public string Name { get; private set; } public Behavior Behavior { get; private set; } public Product(int id, string name, Behavior b...

After reading lot of posts, I realised if an aggregate root exists for a concept/context, we need to have a single repository for that whole concept/context. If thats the case, I see there won't b...

I have two "big" entites or aggregates, which have their own business logic - they are saved, updated and destroyed in separate transactions. They have their own child entities, which are manipulat...

Historically I have performed validation of my objects within their constructors and thrown an exception when validation fails. For example: class Name { const MIN_LENGTH = 1; const MAX_LENGTH ...

I'm working on Vue project and it's getting bigger, so I rewrite whole project and apply MVVM and DDD like architecture like below. UI layer (MVVM ViewModel=vue/Model=Vuex) Domain layer Server la...

Consider the following class. It tries to protect the access to the _assignedTrays. Actually, it works perfectly, since EF automatically links the backing field _assignedTrays to the property Assi...

I have a question regarding what best practice is when it comes to verifying existence of entities across bounded contexts. Is this even a valid approach in DDD? BC are supposed to be self-containe...

I have not found concrete examples of this. I know that each bounded context has its own versions of entities and you should not share entities across contexts. But how do I manage this in relation...

As I read, there are two patterns to define one microservice, by business capability and by subdomain. But I still find it very ambiguous. I get confused how these two patterns differentiate from e...

I am quit new to DDD. I have checked the responses for: Can a repository access another by DDD? prior to asking, but could not find any relevant information. In my application, I have an object wh...