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Ibuildings techPortal: Create MVC: Meet the ViewModel Pattern

Note: This article was originally published at PHPDeveloper on 3 November 2010.
PHPDeveloper

On the Ibuildings techPortal, there's a new tutorial posted from Barney Hanlon looking at a new method that developers can use in their applications to give MVC apps a better way to handle their presentation logic - ViewModel.

This provides MVC applications a natural location for presentation logic and lazy functionality while maintaining the segregation between the layers of responsibility within the code. It allows designers access to data and methods they need, while hiding aspects that aren't needed at view level. [...] Indeed, pretty much any modern Web framework has an understanding of the important segregation of duties inherent within MVC. It is precisely this segregation that leads to a certain greyness around the all-important View, particularly on sites where multiple content items are displayed in different ways.

The tutorial he includes shows how to set up a site with multiple articles per page that can be shown as either headlines or just title text. He talks about three ways to accomplish this - the usual injection of all data into the view and having it handle it there, injecting a model directly and extracting data from it and the ViewModel approach (a combination of the Decorator and Adapter design patterns).