Questions tagged [domain-driven-design]

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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207
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10answers
26k views

Why do we need so many classes in design patterns?

I am junior developer among seniors and am struggling a lot with understanding their thinking, reasoning. I am reading Domain-Driven Design (DDD) and can't understand why we need to create so many ...
104
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6answers
17k views

What is a domain?

I see this term a lot in the context of software architecture ("domain-model", "domain-driven-design" etc.). I have googled it, but I get tons of different definitions. So what is it really?
90
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5answers
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With all of these services, how can I not be anemic?

Where do we draw the line between delegation and encapsulation of business logic? It seems to me that the more we delegate, the more anemic we become. However, delegation also promotes reuse and the ...
84
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4answers
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Rich Domain Models — how, exactly, does behavior fit in?

In the debate of Rich vs. Anemic domain models, the internet is full of philosophical advice but short on authoritative examples. The objective of this question is to find definitive guidelines and ...
64
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4answers
4k views

Programming and Ubiquitous Language (DDD) in a non-English domain

I know there are some questions already here that are closely related to this subject but none of them take Ubiquitous Language as the starting point so I think that justifies this question. For ...
58
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6answers
90k views

Difference between a service class and a Helper class [closed]

I would like to know what differentiates a Service class from a utility class or a helper class? A class only with underlying methods calls the dao's is a service? Doesn't the usage of Helper ...
50
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5answers
1k views

How far should we rename code and data when end users nomenclatures change?

A long time ago we added a feature where our users could "Accept" an image after it was added to a workflow queue. Turns out, we used the wrong term, and users actually "Approve" the image. Changing ...
44
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7answers
6k views

Can a system be 100% Data Driven?

My new boss has been working on this project for many years. I've only been here a few weeks, but I am not sure it's possible. He would like to design a system that is "100% data driven". So if we ...
44
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11answers
22k views

Best practice or design patterns for retrieval of data for reporting and dashboards in a domain-rich application

First, I want to say this seems to be a neglected question/area, so if this question needs improvement, help me make this a great question that can benefit others! I'm looking for advice and help from ...
43
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8answers
8k views

Is domain driven design an anti-SQL pattern?

I am diving in the domain driven design (DDD) and while I go more deeply in it there are some things that I don't get. As I understand it, a main point is to split the Domain Logic (Business Logic) ...
43
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7answers
57k views

Application layer vs domain layer?

I am reading Domain-Driven Design by Evans and I am at the part discussing the layered architecture. I just realized that application and domain layers are different and should be separate. In the ...
40
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6answers
16k 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. ...
40
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3answers
18k views

What, in reference to DDD, is a bounded context?

When working through the book "Implementing Domain Driven Design" by Vaughn Vernon, I have been unable to gain a good grasp on what a bounded context actually is. The book defines a bounded context ...
38
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4answers
17k views

Where we should put validation for domain model

I still looking best practice for domain model validation. Is that good to put the validation in constructor of domain model ? my domain model validation example as follows: public class Order { ...
38
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2answers
10k 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 ...
35
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5answers
4k views

Is it still valid to speak about anemic model in the context of functional programming?

Most of DDD tactical design patterns belong to object-oriented paradigm, and anemic model describes the situation when all business logic is put into services rather than objects thus making them a ...
34
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7answers
8k views

Do RESTful APIs tend to encourage anemic domain models?

I'm working on a project in which we are trying to apply both domain-driven design and REST to a service-oriented architecture. We aren't worrying about 100% REST compliance; it would probably be ...
33
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1answer
28k views

Why database as queue so bad? [closed]

I've just read this article, and I'm confused. Let's imagine 1 webapp and 1 distinct application acting as "worker", both sharing the same database. Oh, I said "sharing"..but what does the article ...
31
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10answers
27k views

Using a GUID as a Primary Key

I generally use auto increment IDs as Primary Keys in databases. I am trying to learn the benefits of using GUIDs. I have read this article: https://betterexplained.com/articles/the-quick-guide-to-...
28
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2answers
18k views

DDD repositories in application or domain service

I m studying DDD these days, and I m having some questions concerning how to manage repositories with DDD. Actually, I have met two possibilies : First one The first way of manage services I've ...
27
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2answers
3k views

Is a Unit test considered brittle if it fails when the business logic changes?

Please see the code below; it tests to see if a person with Gender of female is eligible for offer1: [Fact] public void ReturnsFalseWhenGivenAPersonWithAGenderOfFemale() { var personId = Guid....
27
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2answers
12k views

DDD - Does an aggregate root's repository handle saving aggregates?

I am using a DDD-like approach for a greenfield module of an existing application; it's not 100% DDD due to architecture but I'm trying to use some DDD concepts. I have a bounded context (I think ...
27
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1answer
7k views

How to choose between using a Domain Event, or letting the application layer orchestrate everything

I'm setting my first steps into domain driven design, bought the blue book and all, and I find myself seeing three ways to implement a certain solution. For the record: I'm not using CQRS or Event ...
25
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5answers
29k views

Is it good practice to use entity objects as data transfer objects?

I am wondering because if it is, why does Entity Framework not offer logic to create a new object with the same properties to transfer data between layers? I use the entity objects that I generate ...
25
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4answers
11k views

In DDD, is validation application logic, or domain logic?

Suppose that we are modelling a form using DDD; the form may have certain kind of business rules associated with it - perhaps you will need to specify an income if you are not a student, and you are ...
24
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3answers
11k views

What is Domain Driven Development in practical terms? [closed]

I heard about Domain Driven Development from a developer in the area. He talked it up like it was just about the silver bullet to changing requirements. I read the wiki. Still not too clear. What ...
23
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2answers
5k views

Best practices for serialization of DDD aggregates

According to DDD domain logic should not be polluted with technical concerns like serialization, object-relational mapping, etc. So how do you serialize or map the aggregates' state without publicly ...
22
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8answers
6k views

When is primitive obsession not a code smell?

I have read plenty of articles recently that describe primitive obsession as a code smell. There are two benefits of avoiding primitive obsession: It makes the domain model more explicit. For ...
22
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2answers
7k views

How exactly should a CQRS Command be validated and transformed to a domain object?

I have been adapting poor-man's CQRS1 for quite some time now because I love its flexibility to have granular data in one data store, providing great possibilities for analysis and thus increasing ...
22
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5answers
6k views

Unit Testing in a “no setter” world

I do not consider myself a DDD expert but, as a solution architect, do try to apply best practices whenever possible. I know there is a lot of discussion around the pro's and con's of the no (public) ...
22
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2answers
5k views

Domain-Driven-Design - external dependencies in the Entity problem

I'd like to start Domain-Driven-Design, but there are several problems I'd like to solve before starting :) Let's imagine I have a Groups and Users and when user wants to join a group, I'm calling ...
21
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5answers
3k views

Do ORMs enable the creation of rich domain models?

After using Hibernate on most of my projects for about 8 years, I've landed on a company that discourages its use and wants applications to only interact with the DB through stored procedures. After ...
21
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5answers
15k views

How does a REST API fit for a command/action based domain?

In this article the author claims that Sometimes, it is required to expose an operation in the API that inherently is non RESTful. and that If an API has too many actions, then that’s an ...
19
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2answers
582 views

Anemic domain models and domain services injection

The anemic domain model is described as an anti-pattern in domain driven design by Martin Fowler. To have business logic on the domain models often domain services are used. But injecting domain ...
19
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3answers
876 views

Relational databases and iterative development

In many approaches to software development like agile methodologies, Domain-Driven Design and Object Oriented Analysis and Design, we are encouraged to take one iterative approach to development. So ...
19
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3answers
4k 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 ...
18
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8answers
4k views

Do immutable objects and DDD go together?

Consider a system that uses DDD (as well: any system that uses an ORM). The point of any system realistically, in nearly every use case, will be to manipulate those domain objects. Otherwise there's ...
18
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4answers
3k views

How does persistence fit into a purely functional language?

How does the pattern of using command handlers to deal with persistence fit into a purely functional language, where we want to make IO-related code as thin as possible? When implementing Domain-...
17
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5answers
9k views

Is it bad practice for services to share a database in SOA?

I have recently been reading Hohpe and Woolf's Enterprise Integration Patterns, some of Thomas Erl's books on SOA and watching various videos and podcasts by Udi Dahan et al. on CQRS and Event Driven ...
17
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2answers
1k views

Is DDD-Lite a pattern language for dependency injection?

I stumbled upon Greg Young's talk 7 Reasons why DDD Projects Fail where he mentions something he calls DDD-Lite at 7:20. Summarizing, he basically says some use DDD as a pattern languages (entities, ...
17
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3answers
11k views

MVVM, DDD, and WPF Layered Application Project Structure Guidance

I am trying to setup my application's structure in VS and I want to "try" and future proof it to a reasonable level. This application will be a WPF re-write of an old Winform app that had followed no ...
16
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2answers
6k views

DDD Bounded Contexts & Domains?

I've been working in a relatively complex application with 10's of database tables (Aggregates, Entities/Value Objects) and applying DDD. At this point it appears to be basically DDD-Lite meaning that ...
16
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1answer
2k views

Is Domain Driven Design useful / productive for not so complex domains?

When assessing a potential project at work, I suggested that it might be advantageous to use a domain driven design approach to its object model. The project does not have an excessively complex ...
16
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3answers
4k views

How to handle post-validation errors in command (DDD + CQRS)

For example, when you submit a Register form, you have to check in the Domain Model (WriteModel in CQRS) that it is in a valid state (example, email address syntax, age, etc). Then you create a ...
15
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3answers
4k views

When using DDD and CRQS, should be exactly one event per command?

I am looking for a way to design a ddd application with convention over configuration. Say an aggregate "Client" has a command defined "FillProfile". It will logically raise an event "ProfileFilled". ...
15
votes
7answers
2k views

What is the best practice for gathering requirements when a customer does not know what he wants? [duplicate]

Possible Duplicate: How do you deal with changing requirements? This question must have been asked a thousand times but there seems to be little progress in this area: I have asked the customer ...
15
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2answers
16k views

Is this a good Visual Studio solution structure for a domain driven design RESTful web service?

I am building a .NET 4.5 C# Web API RESTful solution and I would like someone to tell me if my project solution is correct and/or wise(-enough?) for a solution designed using Domain Driven Design, ...
15
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3answers
5k views

When should an Aggregate Root contain another AR (and when should it not)

Let me begin by first apologizing for the length of the post, but I really wanted to convey as much detail up-front so I don't take your time going back and forth in comments. I am designing an ...
15
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6answers
2k views

Autonomous Microservices, event queues and service discovery

I've been reading a lot about micro-services lately, and here are some of the conclusions I got so far (please correct me if I'm wrong at any point). Micro-services architecture goes well with domain ...
14
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5answers
8k views

How to combine strict TDD and DDD?

TDD is about designing code, guided by tests. Thus, typical layers aren't usually built upfront; they should slightly appear through refactoring steps. Domain-driven design involves a lot of ...