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9
votes
3answers
352 views

Is that good idea to add ViewModel exactly same as Model

I have following layers in my solution: App.Domain App.Service App.Core (maybe you call this one App.DataLayer) App.Web Software design pattern is not my question, I have following Model in Domain ...
7
votes
2answers
154 views

How much should a view know about model?

I am building an application in python with a python wrapper for WPF and with DAG support. I am currently at a point where I have to decide a consistent way of interacting between the data and the ...
6
votes
4answers
1k views

Advantages of using business logic in model

In an MVC framework i have often heard that use business logic in a model. But i think using the business logic in controller would run faster as view is directly connected to controller. I want to ...
6
votes
4answers
597 views

Achieving decoupling in Model classes

I am trying to test-drive (or at least write unit tests) my Model classes but I noticed that my classes end up being too coupled. Since I can't break this coupling, writing unit tests is becoming ...
6
votes
1answer
5k views

Can someone explain the V Model process? Why is it different than the Waterfall model?

It seems the V Model is just the Waterfall Model with the bottom half of the Waterfall bent upwards to form a V. I don't see how it adds anything new. From the diagrams, I also don't understand the ...
6
votes
3answers
559 views

Drawing the line between models & libraries?

As my webapps increase in size, so does the complexity. In order to keep my classes & files structured and easy-to-access, I am starting to get more and more confused: I have some very clearly ...
5
votes
2answers
2k views

How can I design a model layer without ORM, and when should I use it?

I'm a PHP developer who started with CodeIgniter. In it, designing models was easy: it seemed like each method defined in models was the equivalent of static methods in a normal, objected-oriented ...
5
votes
2answers
416 views

MVC two models required?

I've been doing software for a long time, but almost all of it has been back-end centric. I recently decided to learn Swing and tried to apply MVC principles. I realize that in Swing the View is ...
4
votes
3answers
7k views

Mapping between 4+1 architectural view model & UML

I'm a bit confused about how the 4+1 architectural view model maps to UML. Wikipedia gives the following mapping: Logical view: Class diagram, Communication diagram, Sequence diagram. Development ...
4
votes
2answers
245 views

Breaking Up A Model Class - MVC

I am not sure whether there is a 'right' or 'wrong' answer to this one, but I was curious about the general consensus. I have a User model that currently performs user functions (such as retrieving ...
4
votes
1answer
201 views

Is there an industry standard for systems registered user permissions in terms of database model?

I developed many applications with registered user access for my enterprise clients. In many years I have changed my way of doing it, specially because I used many programming languages and database ...
4
votes
1answer
244 views

Are Session implicit objects examples of Models in MVC?

I have read that the Model is responsible for maintaining state among HTTP requests, for example in this article: The Model is responsible for maintaining state between HTTP requests. ...
3
votes
3answers
544 views

How does accumulating large amounts of business logic on the model objects make building strong service contracts harder?

I heard a couple of times that putting business logic in database models is bad down the road. I just read this in blog of a Rackspace employee: The Django ORM also tended to have us accumulate large ...
3
votes
2answers
171 views

Why is the Document Object Model the view?

I was told by a Javascript programmer not to do DOM manipulation in model code. I also remember hearing a snazzy tune for a JS framework (I forget which one): "Get your models out of the DOM". This ...
3
votes
1answer
186 views

Model of simple traffic simulation [closed]

I want to write a simple traffic simulation with one road intersection. First I thought of a cellular automata in the model but it should not be limited by an underlying discrete grid system so the ...
3
votes
1answer
2k views

How to create view models - Constructor, Factory Method, …?

I'm trying to lead a charge for re factoring our rather bloated controllers. We currently have a BaseModel from which all our other models inherit. The BaseModel contains things common to all pages, ...
3
votes
2answers
362 views

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 ...
3
votes
1answer
61 views

Can a model have itself as a foreign key?

I am doing a coding project in rails. I have a user model, and I want to add a "spouse_id" to it (which would reference other users). Can a model reference itself in a foreign key?
3
votes
1answer
1k views

How should I architect my Model and Data Access layer objects in my website?

I've been tasked with designing Data layer for a website at work, and I am very interested in architecture of code for the best flexibility, maintainability and readability. I am generally acutely ...
3
votes
2answers
481 views

It is bad practice to hard couple logging interface/implementation with business model classes?

Should we avoid using logging in business model classes and try to move logging to service/controller classes? In for example java context, logging in model classes will hard couple the code with ...
3
votes
2answers
316 views

Design suggestions needed to create a MathBuilder framework

Let explain what I'm trying to create. I'm creating a framework, the idea is to provide base classes to generate a math problem. Why do I need this framework? Because at first time, I realized when I ...
2
votes
1answer
76 views

How valuable is decoupling in proprietary software?

When developing with Symfony2 PHP framework I often see reccomendations to decouple code but most of the time that is accompanied by a 'if you want to release as a third party bundle'. Which begs the ...
2
votes
1answer
164 views

Separating model from UI

I have a Swing application with a custom TreeModel that can refer to domain instances. I'm wondering what changes I could make if I consider moving to a web interface later on. Would a pluggable model ...
2
votes
3answers
507 views

PHP Code base design: Single “queries.php” file, or spread queries across different php files/classes?

When I create PHP projects, is it better to put all database (e.g. MySql) queries in a single file (i.e. "queries.php")? Or is it better to place the respective queries in any "model" classes (i.e. ...
2
votes
1answer
100 views

Models, collections…and then what? Processes?

I'm a LAMP-stack dev who's been more on the JavaScript side the last few years and really enjoying the Model + Collection approach to data entities that BackboneJS, etc. uses. It's helped me organize ...
2
votes
2answers
456 views

MVC: “User” model gets big and crowded. Should methods that do CRUD operations on one-to-many relationship data be in different models?

In most MVC web projects there is a User class. Many times a user has something else in a one-to-many relationship, i.e. orders. If we have a user class that has many orders, should methods that add, ...
2
votes
0answers
31 views

How to handle multiple models that relate to a single model

First of, sorry for the vague title. In our website framework, we have modal classes to represent our database tables, that hold a rows data. I'm currently working on a stat style page, and I'm ...
2
votes
1answer
413 views

Usage of MVVM in iOS

I'm an iOS developer and I'm guilty of having Massive View Controllers in my projects so I've been searching for a better way to structure my projects and came across the MVVM (Model-View-ViewModel) ...
1
vote
4answers
244 views

how to create a data model for the following problem

How to tackle 2-D and 3-D space in data ? lets say you are working on a power grid problem. You need to represent Towers; transmission lines; transformers and every thing else in a 2-D space. How ...
1
vote
3answers
534 views

MVC: What is the difference between a model and a service?

Why in some frameworks the logic layer is called "Model" whereas in some it is called "Service". Are they different from each other or just different by naming conventions? UPDATE 1 The reason I'm ...
1
vote
2answers
635 views

MVC Best practices (view acquiring data directly from model) and Yii Framework

I'm using Yii for a few years and only right now I realized, that their demo application (empowered by CRUD auto-generation tool -- Gii) seems to be breaking key MVC architecture pattern. I'd like to ...
1
vote
1answer
109 views

Laravel using models

I started working with Laravel about a month ago and I started by reading the documentation etc. Now I'm working on a project in Laravel 4.2 and I skipped some parts of the full documentation. In my ...
1
vote
1answer
196 views

Best practices when dealing with lots of empty table columns?

I have a schema that allows for multiple post types in my Django project (kinda like Tumblr). Users can make Posts of different types. One of those types is a photo, which I'll want the EXIF data for. ...
1
vote
2answers
147 views

Getting related foreign keys from parent entities

I'm thinking about a design issue which affects my project's data base. Supposing there are three diferent tables: CLIENT ORDER PACKING_SLIP Each order has its client and different packing ...
1
vote
2answers
132 views

Model Driven Architecture Approach in programming / modelling

I know the basics of the model driven architecture: it is all about model the system which I want to create and create the core code afterwards. I used CORBA a while ago. First thing that I needed to ...
1
vote
2answers
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 ...
1
vote
2answers
36 views

Application model management questions

Consider the following type of Java / Spring web application, with an SQL database: there are multiple data entity types (about 100) with relations between them the entities are viewed, edited or ...
0
votes
6answers
3k views

When to use the 3 layers model?

I was recently exposed to the three layer model (DAL,BL,UI). Someone told me I should ALWAYS work with this model. I have a medium project that I'm starting and I have doubts whether I should build ...
0
votes
1answer
836 views

Is Microsoft Solver capable of solving such complex scheduling problems

I'm writing a application that will decide the scheduling plan for a few dozen people according to their occupation (role) and availability (week day and hours). I've used a excel spreadsheet to help ...
0
votes
2answers
351 views

Google App Engine overview

I have gone through many Google App Engine tutorials, and I became quite familiar with how to do basic stuff like implementing a webapp2.RequestHandler, and using ndb.Models to manage your data. Now, ...
0
votes
1answer
65 views

MVVM model vs viewmodel

I am trying to wrap my head around MVVM and "models should not have behaviour". If my getter depends on an environment variable, should it be in the model or viewmodel? Does it make a difference if ...
0
votes
1answer
15 views

Designing the model layer to be serializable

I am creating simple desktop application in javaFX 8 and I would like to be able to save the state of the model and load it next time the application starts. Therefore I am implementing the ...
0
votes
1answer
60 views

Multiple models or a single model with multiple custom data types?

I am writting a small webapp for learning. Is it better / best practice to create multiple models or one model with multiple custom data types? For example: Let's say the web app is "PublicLibrary." ...
0
votes
1answer
79 views

What's the difference between model for test and model for development?

What's the difference between model for test and model for development? Is it that the model for test contains only what we should test? Do we use the same diagrams in model for test and model for ...
0
votes
2answers
126 views

Bucketing model by time

I have a model which has timestamped entities. Now I want to do bucketing - "buckets" of entities which can be reasoned about a single entity. Also I want to be able to access related entities from a ...
0
votes
2answers
65 views

Is it 'safe' to expect myClasses to agree not to only call package Scope methods from other Package scope methods?

The questions says it all, but a quick overview of the situation. I'm creating a Model which contains classes (all inherriting myObject) which have a large amount of interconnection. I want the ...
0
votes
1answer
774 views

Convention on model names in ruby on rails

I was doing my ER diagram for a rails application I'm about to begin with and there I have an entity called Class News so I'd have a model ClassNew but I don't know if I will have problems in the ...
0
votes
1answer
172 views

Parameterized Django models

In principle, a single Django application can be reused in two or more projects, providing functionality relevent to both. That implies that the same database structure (tables and relations) will be ...
0
votes
1answer
161 views

Which one of these implementations is more appropriate for my REST api?

Background So I have a REST API that allows for client applications to access and manipulate users' data. I'm in the process of writing an Objective-C class for simple utilization of this REST API, ...
0
votes
1answer
99 views

Model Design: Which layers should access resources?

I am implementing a model design where DB tables are 'resources', and a model can use many 'resources'. When I return a row from a table, it is represented by an 'item'. (This came from a book by ...