Questions tagged [ddd]
Domain driven design (abbreviated as DDD) is a design methodology that focuses on the domain. What is an object and what is an attribute is determined by their place in the real world.
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Knowledge-based authentication using Domain-driven Design in C# [closed]
As part of an insurance claims system we have created, the claims managers can log incoming telephone calls relating to a claim.
The claims manager must validate the caller by asking a number of '...
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First domain-driven User entity class
I'm still learning about domain driven design, and I have created my first entity class User.
Is this fully compliant with the DDD principles? Particularly my ...
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Logging strategy setup
I finally set up my logging infrastructure to work as desired, however I feel like I had to do quite a lot things just to fulfill a few requirements. Now I'm worried if my approach has major drawbacks,...
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DDD Architecture for an e-commerce website (uploading images)
Problem Description
I am working on an e-commerce website, when a user wants to sell a product, he would open the product page and he can upload up to 12 photos:
Image Upload Process
This is the ...
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Domain driven designed game to play with city names
I am building a game where two players have to pronounce name of a city. The main rule is better to explain with the following example:
computer starts with "New York"
player tells "Kopenhagen", as ...
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Representing a property with a non-nullable getter & a nullable setter
I have a class as follows, where I want the user of the class to know that setting the Slug property to null is supported, and its getter will still return a valid value:
...
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Implementing a domain model
My domain model consists mostly of simple DTOs, i.e. 'Data Transfer Objects' which this article distinguishes from 'Plain Old C# Objects', like this one:
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Value Object encapsulating different units of measure
I have a situation where I need to use person's height in different units. Some parts of the system use Inches/Feet some Meters/Centimeters.
I was thinking of a Height value object which would ...
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Event sourcing using functional programming
Is this a satisfactory implementation of event sourcing using functional programming?
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Web-app for tracking containers
Nowadays I am learning Domain Driven Design intensively. I am reading the book called Domain Driven Design by Eric Evans, and at the same time I try to apply the knowledge on a real life project I ...
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UnitOfWork for sending mail
Topic is about a LoB web application written in C# for ASP.Net Core. We're following the blue book DDD architecture. We're using SimpleInjector as dependency injection container. Every request opens a ...
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Using a Generic Value Object in a DDD application
I am writing this question in the context of a DDD application. I found this code online on a number of blogs etc e.g. here and here.
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Is there a better way to unit test a repository for a large aggregate root?
In our project we use domain-driven design and our customer aggregate root is large. The unit tests for the aggregate root itself are simple (~50 or so tests), but I am struggling with the repository ...
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Condition class
Up-to-date version: Countable and uncountable sets in .NET (IEnumerable and Predicate).
Here is my own predicate class; it is equipped with some operators. Demo:
...
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2
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Countable and uncountable sets in .NET (IEnumerable and Predicate)
There is a full featured support of countable sets in .NET: IEnumerable<T>. What about uncountable sets; sets defined by predicate? How can they be ...
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1
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Querying the Google ads API
I have a method which relies heavily on object supplied by third party APIs. Below is my working code, is there any scope of improvement?
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1
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Grouping low-level services together into a high-level service
I am working on an e-commerce website. What I need to do is to save an advertisement. The ad has some properties and some photos... properties should be save to DB and photos should be saved to file ...
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Designing domain models for hierarchical data (in DDD)
It is my first attempt in DDD and I'm trying to wrap my head about this concept. In my examples a lot of validation is omitted for simplicity. I have two types of InterfaceConfigurations:
VistaLink: ...
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DDD - Interaction between 2 entities
I've been taking a crack at Domain Driven Design, SOLID principles, and unit tests to write more maintainable code in the future.
Though I tend to run into the same issue: While I have many classes/...
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1
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Countable and uncountable sets in .NET (clean version)
Sorry, it used to be some retired garbage in Countable and uncountable sets. Now and here it is clean.
P.S. I would not like to say that this stuff is about to replace functional programming :) No, ...
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DDD architecture pattern
I'm trying to understand the DDD architecture pattern. I wrote a simple project in which I tried to use DDD arch. Here are my doubts after implementing it:
Does it make sense to use an ORM for a DDD ...
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Replacing an application service class with multiple command handlers
I have a Controller which uses an application service to accomplish its tasks. The service class is starting to grow big and developing multiple dependencies. So I am thinking of replacing the single ...
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Service for querying resource availability, following DDD
I'm writing a service (asp.net core) in charge of determining availabilities of resources (rooms, desks...). I'm also trying to stick to the DDD principles to improve the quality of my code.
I have ...
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A Stateless Immutable Event-Driven DDD Pattern in Kotlin
I've been interested in making fully repeatable, reproducible game states. This led me into the world of DDD, and specifically, the concept of Aggregates + Event Sourcing (although that's not ...
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Simple REST web service
I am a young computer science student programming mainly in Java.
I wrote a simple RESTful web service using Spring Boot Framework and the DDD architecture pattern. The project is a library ...
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1
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OOP at the boundary
I'm trying to implement a simple service in the true OOP way. This means for me that the domain objects has no technical or non-business-related methods (in practice no getters/setters).
Here are the ...
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DDD modeling for a User Voice-like system
I've taken on the challenge of modeling a simple User Voice-like system. High-level description:
It's a portal for some SaaS users;
They come and leave feature requests, suggestions, etc.;
They ...
2
votes
1
answer
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DDD model of a purchase in NodeJS
I already have some experience with Java and I'm used to modeling with a DDD approach. Therefore, now I'm beginning with JS and NodeJS and I'd like to know which is the best practice to design with a ...
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Class that calls initiates the validation of itself and then initiates the assignment of offers
Please see the code below:
...
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1
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DDD Domain Objects, Factories, and Presenters
Aloha,
I am working to understand some of the different pieces of domain driven design. In this particular case, I have a NameFactory that builds a Name domain object. I also have a NamePresenter ...
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votes
1
answer
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IEnumerable and Predicate sets in .NET
GitHub Repository
Previously: Countable and uncountable sets in .NET (clean version).
Thesis
There is a full featured support of countable sets in .NET: ...
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0
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Best approach to parse data from multiple APIs to Entities in PHP
I built an application that extracts and updates data from multiple ecommerces websites. Each eCommerce is either built using platforms/frameworks such as Shopify, Prestashop or WooCommerce. This ...
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Business Rule DSL for Values in Domain-Driven Design
Following the patterns from the book Domain Modeling Made Functional, I am implementing a single-case union for the simple values in my domain model instead of using primitives. The union cases have ...
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Centralized static factory methods with dependency injection
I am trying to make a small e-commerce backend in php. I centralized all the static factory methods in a class called EntityFactory. The main reason for that was to ...
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Countable and uncountable sets in .NET (set operators, demo)
Up-to-date version: IEnumerable and Predicate Sets in .NET (Complete, Explained).
Previously: Countable and uncountable sets in .NET (clean version).
Disclaimer: Please do not interpret my attempts ...
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2
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DDD: interaction between 2 objects in a RPG-game
Context
PlayerHouse is a place where the Player (the game character) can refill its health, store its inventory, etc. like in a RPG-game. The user can upgrade it for example to refill player's health ...
user244597
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2
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Check repository for a nested entity
I have a Product entity and a ProductCategory entity. Given the Product entity, my ...
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Specification pattern vs Always valid domain model [closed]
Let's say we have two aggregates:
...
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DDD design: Tracking price calculation progress and fallback price calculation
I am pretty new to DDD, so any help/ideas will be appreciated. I will explain my initial design and problem below.
The user can ask the system to generate products proposal, proposal is basically ...
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0
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Design Web API with Command Handler
I'm setting up new API to Setup LocalAccounts and need your advice on how to design the API with CQS
some background :
LocalAccount Is Account that related to ...
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0
answers
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Modeling the Aggregates in the following Bounded Context - Domain Driven Design
I'm currently developing an application in ASP.NET Core 2.2 with Domain Driven Design. What you see in here is a Unit Creation page.
A Unit is composed of competences. A unit must have at least one ...
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Modeling domain layer for basic workflow system
As so far I've been mostly developing existing products and doing maintenance/engineering I feel in need to model something from time to time for fun and for self educational purposes.
Attached code ...
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Is it fine to use my domain model as DTO (Entity Framework Core)? [closed]
I was reading about anemic data models and rich domain models in DDD. I don't want to follow DDD completely but take rather pragmatic approach and just take some concepts out of it because clean ddd ...
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A simple event sourcing application using postgres and kafka as an event store
I am creating a simple banking application using event sourcing and CQRS. The application uses postgres and kafka as an event store. The source code can be found at source. Currently, the application ...
