The domain-model tag has no wiki summary.
33
votes
5answers
3k views
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 ...
8
votes
3answers
930 views
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 ...
7
votes
3answers
341 views
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 ...
7
votes
3answers
248 views
Resources for popular domain models
I have come across many situations where I had to build a system for a library or a clinic or other popular domains.
The thing is a domain model for a library was probably done 1000 times already with ...
6
votes
1answer
430 views
Definition of a 3-tier system
People often claim that they are following a '3-tier (or n-tier) architecture', and sometimes they then claim to be switching to a Domain Model. But I really never have understood what this mythical ...
6
votes
1answer
306 views
Do ORM POCOs replace domain entities?
This is somewhat similar to this question but more broad.
In general, with ORMs like EF 4.1 supporting POCOs, does it now make sense to have your domain entities be the objects that are persisted to ...
6
votes
1answer
230 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, ...
5
votes
6answers
419 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 ...
5
votes
2answers
454 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 ...
4
votes
3answers
2k views
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 ...
4
votes
4answers
143 views
Most logically consistent way to create methods of the form a affects b?
I have a common scenario where I have an object (a) that logically affects another object (b), like a makes a note on b, or a marks b as disabled (usually a is a user object of the system and b is ...
4
votes
2answers
430 views
ORM domain design pitfalls
Are there any patterns which seem sensible when designing an object oriented domain, but do not translate nicely onto a relational database schema? If so, are there standard patterns that can be used ...
4
votes
2answers
217 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 ...
4
votes
1answer
46 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 ...
3
votes
2answers
165 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 ...
3
votes
3answers
376 views
How do we handle Categories in database schema and model classes
I am trying to develop an ecommerce solution but stuck on the categories management issue and don't know how to proceed further.
See, A category will have a parent category, which in-return can also ...
3
votes
2answers
252 views
How should I include third-party models in my domain model?
I'm currently trying to design a little application using Domain Driven Design but I'm afraid I don't really get the concept yet. Let me try to explain this as clearly as possible.
public interface ...
3
votes
1answer
91 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 ...
3
votes
2answers
47 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 ...
3
votes
2answers
237 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 ...
3
votes
1answer
138 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 ...
3
votes
3answers
147 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, ...
3
votes
1answer
288 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 ...
3
votes
1answer
133 views
Integrating Domain Model Applications - Resources/Guidance
I'm struggling to find guidance on integrating various applications, usually based on a Domain Model architecture. The applications often expose and consume each others WCF services, but this tends to ...
3
votes
2answers
54 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 ...
2
votes
1answer
58 views
Is there any scenario where it's useful to keep mutable properties cached in domain objects for anything else than informational purposes?
Usually in a domain model, you'll have objects, and those objects will have properties that are mutable and properties that are immutable - for instance, a instance id/name will be immutable, while ...
2
votes
1answer
213 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 ...
2
votes
1answer
118 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. ...
2
votes
1answer
197 views
Should the domain model include all the domain entities in my project?
I have currently reading Grails and I love it. In order to get hands on experience with Grails I decided to create a web application for some Management System. Ya as you can guess there are plenty of ...
2
votes
2answers
238 views
DDD: Developing the Domain Model alone
In DDD examples it seems the common method for developing the domain model is to sit with domain experts and iterate over versions of the model, say on a whiteboard, continually modifying it and ...
1
vote
2answers
228 views
Domain model for education
Are there any domain models already created for education industry? For example we have Prima IBCS for insurance. I was looking for something along similar lines.
1
vote
1answer
37 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 ...
1
vote
1answer
211 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 ...
1
vote
2answers
318 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 ...
1
vote
1answer
363 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 ...
1
vote
2answers
1k views
Anemic Domain Model, Business Logic and DataMapper (PHP)
I've implemented a rudimentary ORM layer based on DataMapper (I don't want to use a full blown ORM like Propel/Doctrine - for anything beyond simple fetch/save ops I prefer to access the data directly ...
0
votes
1answer
41 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 ...
0
votes
1answer
66 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 ...
0
votes
0answers
64 views
Domain modelling & nested many-to-many relationships with pure ADO.NET
I am to develop a user maintenance application. Not having a whole lot of experience, I'm coming across some issues while building the service layer (WCF) regarding the architecture, domain models, ...
-1
votes
1answer
77 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 ...
