Domain-driven design (DDD) is an approach to develop software for complex needs by connecting the implementation to an evolving model.

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What is business logic code and what is data access code, and what's the difference?

I ask this because it seems people usually consider the code that goes into a DAO or Repository implementation as "data access code", while the code that directly uses these DAOs/Repositories as ...
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1answer
298 views

Separation of concerns between repository and service in DDD with complex entities

This probably seems as an example of opinion-based question, but I'm actually looking for rationale on how to decide correctly, I believe there is a correct solution that can be backed by solid ...
3
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1answer
727 views

How Add/Create* commands should be handled in CQRS + Event Sourcing architecture

I want to implement my first application using CQRS pattern along with Event Sourcing. I am wondering how creation of aggregate roots should be handled properly. Let's say someone sends CreateItem ...
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342 views

How does a search functionality fit in DDD with CQRS?

In Vaughn Vernon's book Implementing domain driven design and the accompanying sample application I found that he implemented a CQRS approach to the iddd_collaboration bounded context. He presents ...
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2answers
191 views

Is this too much work for a Gateway to do?

I'm writing a Gateway class that wraps access to a web service which provides information about a player's item inventory in a video game. This web service returns a variety of information, however I ...
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1answer
153 views

Single source of truth within an enterprise distributed system

Within an enterprise distributed system I have many services - an ecommerce service, a CRM, support desk, finance, billing. Many of these services share common data, such as Customer data. These ...
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4answers
102 views

Handling DomainExceptions using REST endpoint

Suppose I'm doing some DDD. Now, I have a microservice reflecting a bounded context/a part of a bounded context. Now, suppose there is a REST endpoint: '/somedomainmodel/someaction' My API user is ...
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2answers
336 views

What is the best way to create DTOs from entities and update entities from DTOs in a layered architecture?

Option 1: At first I would make a call to my service layer, which served as an API for my core domain, to get a domain object or a list of domain objects and then pass them into the assembler which ...
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48 views

A layer of abstraction too far?

Using an enterprise service bus, a message translator pulls a message off the queue ready to be consumed by a service. The translator picks up the message in a canonical data model (CDM) form and ...
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25 views

DDD Request Validation Handling

I stuck somewhere that I can't find a solution! There are plenty of validation questions here, but as far as I see, most of them were asking about entity validation. But what about request validation? ...
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2answers
249 views

Should a domain object wrap/contain a DTO interface?

Using .NET - I have an interface IPerson. This interface is implemented by classes in multiple, separate repositories, e.g. EF6 (EfPerson), custom SQL (SqlPerson), or even custom assembly connecting ...
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1answer
125 views

DDD Architecture in a MVC web application

I am putting together a web application using DDD however am strugleing to put the text book DDD model into a real world MVC application. I currently have these layers: Controllers > ...
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34 views

DDD: Put logic in service or aggregate root?

Let's say we are building a document management system. One project has many documents. I decide to make projects as aggregate root. If the logic to add one document into project is complicated, I ...
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3answers
106 views

Design ideas - validation based on conditions outside of the domain

I am facing a very interesting problem here, and I'd like to see some design ideas from domain driven design perspective. To make it easier to express what I need I have following hypothetical ...
4
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1answer
62 views

DDD – duplicity between Aggregates – should I use one table?

I understand that there exists duplicity of data between Bounded Contexts. The thing is that I'm not really sure about duplicity of data between Aggregate roots. Example: I have product in Product ...
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1answer
192 views

DDD Validation best practice: entity containing data dosen't have the context to validate before data is set. Where should set function be?

I am pretty new to DDD, so bear with me. I have a Chat room and people in the Chat room. The people in the chat room need to propose a date they would like a webinar to be on. we have a bussiness ...
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2answers
62 views

Models, types, different views and meta data

We have a software which purpose is to be used to help users build their own applications. It has to be very loose coupled with the infrastructure: for example, I can imagine users running it on MySQL ...
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3answers
332 views

Repository matrix pattern?

I'm trying really hard to refactor some of my legacy code in the project using best practices and design patterns + DDD so I'd love some feedback on an issue I'm currently having. Let's assume that I ...
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2answers
129 views

Object Oriented Analysis and Design and DDD together

I fear this question seems to broad, so I'll try to explain what I mean with some detail. I couldn't, however, find a way to divide it into other questions. If that's really the case, I gladly accept ...
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1answer
241 views

Domain Driven Design - designing Aggregate Roots

Imagine you're designing an application for organizing Workshops. Workshop itself is quite complicated - it acts as a state machine with multiple possible states and transitions between them. We're ...
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2answers
141 views

Domain driven design, can two aggregates have the same root?

For the purpose of separating different functionality into different classes, I have two following Aggregates: ActiveEmployee AssignTask () ReassignManager () Deactivate (string reason) ...
2
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2answers
672 views

Repository pattern implementation that knows nothing about the database table and column names

I've seen around the Internet and Github, implementations for the design pattern Repository that knows about database table and column names. I was think, if I want to work with the database as a ...
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2answers
369 views

Conceptual mismatch between DDD Application Services and REST API

I'm trying to design an application that has a complex business domain and a requirement to support a REST API (not strictly REST, but resource-oriented). I have some trouble coming up with a way to ...
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2answers
100 views

DDD using an ORM and a Active Directory Server for Persistence

With Domain Driven Design one would model out the domain. One would then use an ORM of some sort to take care of the persistence. Say you have a Product entity which has a Name, SKU and an Owner. This ...
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Controlled access to list of entities vs get/set access in domain model

When designing a domain, either way of following approaches can be used to access list of child entities inside a parent entity. 1. Get/Set Following approach is straight forward and simple to ...
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1answer
58 views

DDD - map or object

What is correct by DDD - should I create map of two objects eg Map or should i use more meaningfull object that will contain this pair MoreMeaningfullName{Obj1, Obj2} ? If using first approach, I ...
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2answers
121 views

How to use DDD to solve a common address situation?

This is a simple example to show a situation that I find hard to solve with DDD. Consider this: - A property (e.g. a house) has an Address. - An address can be complete or partial (country only; ...
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311 views

taxonomy of software project resourcing models

I would like to understand the impact of different resourcing models for software projects. First, I would like to identify the different resourcing approaches that are used to resource software ...
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1answer
253 views

Doubts about architectural pattern for customizable standard enterprise application [duplicate]

My company needs to build an application to be rolled out for a lot of clients. This software will have many modules and functionalities, but some of these will need specific adjustments for some ...
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21 views

What is the best way to create DTOs from entities and update entities from DTOs in a layered architecture? [duplicate]

Option 1: At first I would make a call to my service layer, which served as an API for my core domain, to get a domain object or a list of domain objects and then pass them into the assembler which ...
3
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3answers
127 views

Approach to designing a workflow web app that contains some automation

I have been tasked with creating a web application which will provide end-users with a self help workflow, asking them questions and skipping to another part of the workflow depending upon the ...
4
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2answers
234 views

When is it appropriate to map a DTO back to its Entity counterpart

From what I've read and implemented, DTO is the object that hold a subset of value from a Data model, in most cases these are immutable objects. What about the case where I need to pass either new ...
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2answers
392 views

How do you handle shared concepts in a microservice architecture?

I am researching architectural patterns for an application I'm developing and a microservice approach seems like it would be a good choice but I am not sure how to handle interactions between the ...
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1answer
129 views

DDD - Effective Aggregate Design Questions

I just read Effective Aggregate Design, by Vaughn Vernon. Summarizing the takeaway: Model true invariants Design small aggregates Reference other aggregates by identity Use eventual consistency ...
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175 views

Implementing an anti-corruption layer with domain logic

I'm building an application that compiles a single PDF document from multiple source PDF documents as follows: it takes the first page of each source document, stamps certain information on top of ...
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5answers
514 views

Is DDD not appropriate for my website or should I introduce a Query Layer?

I have inherited an ASP.NET website application and the previous developer has used what I believe are some DDD concepts. I am new to DDD and I have to admit I am struggling with the practical side of ...
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4answers
139 views

Design: How to handle user permissions across a system

My team is currently working on a massive refactor of a medium-sized application in PHP. We are doing our best to refactor our code on a module (Orders, Users, Products) basis. The issue that I am ...
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2answers
52 views

Is it normal for service methods to correlate to your views?

I've been working on learning how to implement domain services and view models in my project and have noticed a suspicious trend: When obtaining data for views from my controllers, if my domain ...
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2answers
206 views

DDD - Aggregate root with large number of children

I'll preface this question by saying I am relatively new to DDD so I may be making some fundamental mistakes here! I working on a project which involves the concepts of Accounts and Transactions (in ...
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2answers
58 views

Domain Modeling - Offerings vs. Usages

I have a question about an issue I always seem to run into when building a domain model. The issue comes up whenever a domain object is used in what I am calling an "offering" scenario and in a ...
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2answers
53 views

What layer generates commands for dependent services?

Our business works with truck drivers making pickups/deliveries of containers. The location of containers needs to be tracked. The drivers use mobile devices to generate a "DriverReport" (a log of ...
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2answers
974 views

DDD and the persistence of value objects; must we denormalize?

I've been reading up a lot on Domain-Driven Development, and I came to the question of how to preserve lack of distinct identity with value objects (VOs). While in the DDD world, this is a requirement ...
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1answer
52 views

domain driven design value object behavior

I recently finished Steve Smith and Julie Lerman's excellent Pluralsight course on Domain Driven Design, and I'm applying the training to a project. I have what I think is a good candidate for a value ...
3
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1answer
85 views

How does this kind of application and DDD relate?

In Domain-Driven Design the application is divided, as I understand, into four layers: Presentation Layer Application Layer Domain Layer Infrastructure Layer I understand this well, for instance, ...
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1answer
147 views

DDD friendly N-Tier alternatives

In Eric Evans book on DDD in the Modules section he says, [tiered design] is attempting to address two legitimate issues. One is the logical division of concerns: One object has responsibility ...
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5answers
6k views

Are DDD Aggregates really a good idea in a Web Application?

I'm diving in to Domain Driven Design and some of the concepts i'm coming across make a lot of sense on the surface, but when I think about them more I have to wonder if that's really a good idea. ...
2
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1answer
41 views

When there's no 1-1 mapping between subdomains and bounded contexts?

Reading this question and the accepted answer we see that although we would expect subdomains and bounded contexts to match that's not always the case. The person who wrote the accepted answer states ...
2
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3answers
126 views

Enterprise application object oriented modeling for user and role

Generally in the Enterprise Applications like ERP or ERM, CRM, BP etc. we see two things a lot, one of them is Role and the other one is User. What happens is that in the real world we have some ...
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1answer
147 views

What are subdomains, really?

In studying domain-driven design (DDD), I've come across the concept of subdomain, but I think I don't get it yet. My first understanding of this was that a subdomain is a subset of the domain of the ...
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1answer
259 views

Should I be using separate 'domain' layer?

I have been reading a lot about domain layer and DDD. However I am still confused about it. To me they seem to be a fancy name for business classes however more modelled towards your application ...