A domain model is composed of the objects, behavior, relationships, and attributes that make up the industry that is the focus of development.

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Cascading deletes from an aggregate root through out the entire aggregate doesn't make sense

Based on the same example for this question. Within the Pro ASP.Net MVC 4 by Adam Freeman, there is a discussion on aggregates and aggregate roots with a simple auction system. There are members who ...
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323 views

DDD - Business rule that depends on a service

I got confused about if a domain is required to access an external service in some state of it's life cycle. The business rule is this : If an Employee is accepting a JobSeeker's JobApplication, ...
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183 views

Rich domain model and container services

I have a long experience in programming Java EE projects, but as I noticed most of the job I have done was with Transaction Script (anti)pattern. So I want to learn using a rich domain model, but ...
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198 views

Choosing an ubiquitous language across different bounded contexts

If my domain has several Bounded Contexts, but only ONE team will work on all contexts, should I develop an Ubiquitous language for each context? or should I have only one and force to into all ...
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633 views

ID properties on Domain objects in DDD

In my domain I have an Account object. e.g. class Account { public string Number; public string SortCode; } Within the context of DDD, should this account object have an ID property? The ...
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4answers
327 views

In MV* pattern where does non-business model goes?

I am passing Menu items to View from ViewModel. My menu definition is a model with properties title, image, hasChildren and isEnabled. But this model is meant for UI unlike business domain models like ...
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How do I make a domain model that doesn't violate OOP?

My game reads a number of JSON files, deserializes them, and hands the resulting objects off to the classes that need them. These deserialized objects, which can be thought of as the domain model, are ...
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DDD: Domain Model Factory Design

I am trying to understand how and where to implement domain model factories. I have included my Company aggregate as a demo of how I have done it. I have included my design decisions at the end - I ...
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161 views

Handling “unspecified” values in software

So I'm working on a software product where we have a number of fields that the customer can leave blank, some of which are numeric. To persist these in the database we use nullable columns. Easy ...
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687 views

Ensuring transactional consistency with DDD

I am starting out with DDD and understand that aggregate roots are used to ensure transnational consistency. We should not modify multiple aggregates in one application service. I would like to know ...
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117 views

How does one design his various architecture/business models?

I'm currently learning about various application design approaches and there's one thing I can't really get my head around. Let's say I have a physical device in my network, an IP surveillance ...
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How to isolate a massive and changeable web service [duplicate]

I am trying to come up with a way to wrap a very large web service that changes very frequently. There are 400+ types and each type has 20 to 300 attributes. The service is a SalesForce.com ...
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168 views

Several interdependent models, each with several data sources — how to avoid hell and nightmare

I'm currently working on a project that requires a complicated model structure and I'm struggling with picking the right architecture. First of all, there are several interdependent models. Change in ...
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226 views

Why aren't Entities allowed to reference other entities inside an aggregate except the root?

I have read in several places this following rule concerning Aggregates: Entities in one aggregate can hold references to any other Aggregate Root, but never to an Entity or Value Object inside ...
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1answer
136 views

Aggregate Boundary repository/service design

I am trying to apply DDD to the design of a Release Management system. Domain Entities Project: The project/product/system. ProjectEnvironment: The environments (Test, Staging, Prod) that exist ...
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402 views

Does current evidence support the adoption of Contextual over Canonical Data Models?

The "canonical" idea is pervasive in software; patterns like Canonical Model, Canonical Schema, Canonical Data Model and so on, seem to come up again and again in development. Like many developers, ...
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478 views

Web application / Domain model integration using JSON capable DTOs

I'm a bit confused about architectural choices for the web-applications/java/python world. For c/c++ world the available (open source) choices to implement web applications is pretty limited to zero, ...
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1k views

How do you formulate the Domain Model in Domain Driven Design properly (Bounded Contexts, Domains)?

Say you have a few applications which deal with a few different Core Domains. The examples are made up and it's hard to put a real example with meaningful data together (concisely). In Domain Driven ...
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DDD with ORM where should the business logic go?

I have used an MDA (model driven architecture) tool in the past where we modeled via UML and this generated the business entities (our domain model) and the ORM (mapping etc) amongst other things. A ...
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2answers
104 views

How to deal with data on the model specific to the technology being used?

There are some cases where some of the data on a class of the domain model of an application seems to be dependent on the technology being used. One example of this is the following: suppose we are ...
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3answers
420 views

Architecting multi-model multi-DB ASP.NET MVC solution

I have an ASP.NET MVC 4 solution that I'm putting together, leveraging IoC and the repository pattern using Entity Framework 5. I have a new requirement to be able to pull data from a second database ...
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2answers
1k views

Validation and data persistence in a domain model

My (first and current) workplace (a .NET shop) suffers from an over-abundance of anemic domain models, to the extent that I don't really know how validation and data persistence should be handled in a ...
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529 views

Exposing domain models over API

I'm building a simple RESTful API for a web-based application I'm working on, and I'm wondering about the best way to go about exposing my domain models. Let's say I have a User class and I want to ...
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3answers
290 views

Does an in-code enumeration provide a stronger domain model than a static table?

Does an in-code enumeration provide a stronger domain model than a static database table? As an example, say I have an Marble entity, with a Color attribute. The color attribute has a finite set of ...
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2k views

Auto - incremental ID in Domain Object

I read a lot about auto-incremental id (guid, interlocked.increment, ObjectIdGenerator...) but don't find nothing for my situation. In my domain model user ask to have an automatic progressive ...
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583 views

NHibernate and complex domain model against a legacy database

I'm trying to refactor (actually, rewrite) an application which currently uses only stored procedures to access the database (hundreds of SPs). My goal is to use Nhibernate and follow a good design as ...
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Do MVC web frameworks favor anemic domain model in order to avoid duplication?

Binding directly the form to your model helps a lot to get rid of boiler plate code, but that means that your model must have a getter/setter for each property otherwise it wouldn't be possible. ...
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Accessing Repositories from Domain

Say we have a task logging system, when a task is logged, the user specifies a category and the task defaults to a status of 'Outstanding'. Assume in this instance that Category and Status have to be ...
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171 views

How to salvage a business model from a mismatched database?

There is an application that involves billing enterprise customers for the services their customers utilize. The database schema does not properly reflect the business model. For instance, on a given ...
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1answer
193 views

What is the best way to represent quantity in stock in domain model?

A Transaction contains one or more LineItem. One LineItem has a relation with an Item. Every Item has a number field that represent quantity in stock. Using this approach, every Transaction ...
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342 views

Single Responsibility principle VS KISS principle

Let's assume the modeling of User model in a context of a social network. User concept is composed of two notions: Authentication elements like userName/Password/Email etc... Extra data information ...
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126 views

Extending Composite Structure model generally/in Enterprise Architect

I'm currently on a project, which integrates domain specific techniques in the modelling tool Enterprise Architect through UML Profiles. The domain specfic model almost matches the structure of the ...
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1answer
97 views

Way to allow inspection of java data model after exporting to file

I've refactored a program to remove its dependency on an sql database by storing all the state in a memory model. However the manager liked the ability to easily inspect the domain state just by ...
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60 views

How to model and query spatial responsibilites of company local branches

what are best practices, to model and query spatial responsibilities of company local branches? My company has many local branches which are all in general responsible for 1 city. This is the easiest ...
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362 views

Are factors such as Intellisense support and strong typing enough to justify the use of an 'Anaemic Domain Model'?

It's easy to accept that objects should be used in all layers except a layer nominated as a data layer. However, it's just as easy to end-up with an 'anaemic domain model' that is just an object ...
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124 views

Representing domain objects

This is related to my recent question regarding naming awkward domain objects. A number of answers indicated I was using the wrong representation for the domain objects. To summarize, I chose to use ...
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61 views

Should I use structure from a core library graphic toolkit in my domain?

In java (and many other programming language), there are often structure to deal with graphic element : Colour, Shape, etc. Those are most often in a UI toolkit and thus have a relatively strong ...
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478 views

DDD Model Design and Repository Persistence Performance Considerations

So I have been reading about DDD for some time and trying to figure out the best approach on several issues. I tend to agree that I should design my model in a persistent agnostic manner. And that ...
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626 views

Sample domain model for online store

We are a group of 4 software development students currently studying at the Cape Peninsula University of Technology. Currently, we are tasked with developing a web application that functions as a ...
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548 views

Should a domain expert make class diagrams?

The domain expert in our team uses UML class diagrams to model the domain model. As a result, the class diagrams are more of technical models rather than domain models (it serves of some sort of ...
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2answers
730 views

Can the following Domain Entity contain logic for creating/deleting other entities?

a) As far as I understand it, in most cases Domain Model DM doesn't contain code for creating/deleting domain entities, but instead it is the job of layers ( ie service layer or UI layer ) on top of ...
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86 views

Resources on securing domain models? [closed]

I'm have good resources on both security, domain modelling, and architecture patterns. I've noticed a distinct lack of any suggestion of how and where to integrate security into the systems I build. I ...
3
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1answer
784 views

Domain Models (PHP)

I have been programming in PHP for several years and have, in the past, adopted methods of my own to handle data within my applications. I have built my own MVC, in the past, and have a reasonable ...
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2answers
762 views

Justification for bidirectional relationship

I typically try and avoid bidirectional relationships at all costs. Recently I've been trying to follow a more domain centric design philosophy and I'm looking for advice in the best way to solve a ...
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1k views

Are Persistence-Ignorant objects able to implement lazy loading?

Persistence Ignorance is an application of single responsibility principle, which in practice means that Domain Objects (DO) shouldn't contain code related to persistence, instead they should only ...
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1answer
987 views

Modular Database Structures

I have been examining the code base we use in work and I am worried about the size the packages have grown to. The actual code is modular, procedures have been broken down into small functional (and ...
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1answer
171 views

How do you map members and their responsibilities to an organization? [closed]

I'm working on a Django project that tracks arts-related activities, and I'm stuck on the human-resources part of things. (code below) I have a class Ensemble that subclasses Organization. ...
3
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1answer
163 views

Data/Object Design Problem

Goal: I'm trying to figure out the best way to model/design and then implement a "user" feature in a system. Background: I am designing an on-line access request system, so our company can use a ...
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3answers
267 views

What are the pros and cons of implementing this requirement in different layers?

I have a CRUD app for <DomainObject>s. They are persisted in a database. There is a new requirement: keep track of the <DomainObject>s that have been created since the app was opened, ...
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Are Domain Objects in Domain Driven Design only supposed to be write-only?

I've been reading about Domain Driven Design for almost two years and have been cautiously been introducing some concepts in to my daily work or at least making plans for how things I do regularly ...