DRY vs Security and Maintainability with MVC and View Models

Posted by Mystere Man on Stack Overflow See other posts from Stack Overflow or by Mystere Man
Published on 2010-12-30T16:48:29Z Indexed on 2010/12/30 16:54 UTC
Read the original article Hit count: 170

Filed under:

asp.net-mvc

|

viewmodel

|

dry

I like to strive for DRY, and obviously it's not always possible. However, I have to scratch my head over a concept that seems pretty common in MVC, that of the "View Model".

The View Model is designed to only pass the minimum amount of information to the view, for both security, maintainability, and testing concerns. I get that. It makes sense.

However, from a DRY perspective, a View Model is simply duplicating data you already have. The View Model may be temporary, and used only as a DTO, but you're basically maintaing two different versions of the same model which seems to violate the DRY principal.

Do View Models violate DRY? Are they a necessary evil? Do they do more good than bad?

© Stack Overflow or respective owner

Related posts about asp.net-mvc

Migrating ASP.NET MVC 1.0 applications to ASP.NET MVC 2 RTM

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
Note: ASP.NET MVC 2 RTM isn’t yet released! But this tool will help you get your ASP.NET MVC 1.0 applications ready for when it is! I have updated the MVC App Converter to convert projects from ASP.NET MVC 1.0 to ASP.NET MVC 2 RTM. This should be last the last major change to the MVC App Converter… >>> More
ASP.NET MVC 3 Hosting :: New Features in ASP.NET MVC 3

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
Razor View Engine The Razor view engine is a new view engine option for ASP.NET MVC that supports the Razor templating syntax. The Razor syntax is a streamlined approach to HTML templating designed with the goal of being a code driven minimalist templating approach that builds on existing C#, VB… >>> More
PathTooLongException after migrating from ASP.NET MVC 1 to ASP.NET MVC 2

as seen on Stack Overflow - Search for 'Stack Overflow'
I had updated my app from MVC 1 to MVC 2. After that some pages throws PathTooLongException: [PathTooLongException: The specified path, file name, or both are too long. The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters.] … >>> More
Differece between Asp.net MVC 1 and Asp.net MVC 2

as seen on Stack Overflow - Search for 'Stack Overflow'
what is differece between Asp.net MVC 1 and Asp.net MVC 2? >>> More
Top 5 reasons for using ASP.NET MVC 2 rather than ASP.NET MVC 1

as seen on Stack Overflow - Search for 'Stack Overflow'
I've been using ASP.NET MVC 1 for a while now, and am keen to take advantage of the improvements in MVC 2. Things like validation seem greatly improved, and strongly-typed HTML helper methods look great. So, for those of you who have real-world practical experience of using ASP.NET MVC 1 and are… >>> More

Related posts about viewmodel

Close View From viewModel using MVVM or without ViewModel

as seen on Stack Overflow - Search for 'Stack Overflow'
Is there any way to close the view when user click on the close button (X) on the view or I just want to know something like ApplicationsCommand.close don't want to use IRequestCloseViewModel interface. thanks a lot >>> More
Passing viewmodel to actionresult creates new viewmodel

as seen on Stack Overflow - Search for 'Stack Overflow'
I am using a viewmodel, which i then when to send to an actionresult to use (the modified viewmodel) But in the controller, i lose the list and objects in my viewmodel. This is my view: @using PigeonFancier.Models @model PigeonFancier.Models.InschrijvingModel @using (Html.BeginForm("UpdateInschrijvingen"… >>> More
How to handle One View with multiple ViewModel and fire different Commands

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi All, I have senario in which one view and view has binding with multiple ViewModel. Eg. One View displaying Phone Detail and ViewModel as per bellow: Phone basic features- PhoneViewModel, Phone Price Detail- PhoneSubscriptionViewModel, Phone Accessories- PhoneAccessoryViewModel For general… >>> More
Connect ViewModel and View using Unity

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
In this post i want to describe the approach of connecting View and ViewModel which I'm using in my last project.The main idea is to do it during resolve inside of unity container. It can be achived using InjectionFactory introduced in Unity 2.0 public static class MVVMUnityExtensions{ … >>> More
Rx framework: How to wait for an event to be triggered in silverlight test

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I have a ViewModel that starts loading the Model async in the constructor, and triggers an event when the Model is loaded. I got a test working with the silverlight unit test framework, like this : bool done = false; [TestMethod] [Asynchronous] public void Test_NoCustomerSelected() … >>> More