News Feed
Sections




News Archive
Looking for more information on how to do PHP the right way? Check out PHP: The Right Way

Mathias Verraes:
Value Objects and User Interfaces
November 18, 2013 @ 11:35:07

Mathias Verraes has a new post today with a response to an email he received about some comments on a recent Elephant in the Room podcast about Value Object usage. The question asks about usage of Value Objects, specifically when it comes to things like country information.

There's nothing intrinsically wrong with modeling countries as entities and storing them in the database. But in most cases, that overcomplicating things. Countries don't change often. When a country's name changes, it is in fact, for all practical purposes, a new country. If a country one day does not exist anymore, you can't simply change all addresses, because possibly the country was split into two countries. Whenever you have this kind of friction, there's usually some missing concept screaming to be discovered.

He talks some about the concepts around the "country" data and some of the functional concerns around it (duplicate checking, validation of existence, etc). He takes the concept and breaks it out into two different concepts - the actual Value Object of a single country and an "AvailableCountries" set (and "AvailableCountryRepository").

0 comments voice your opinion now!
value object country example registry set

Link: http://verraes.net/2013/11/value-objects-and-user-interfaces/

blog comments powered by Disqus

Similar Posts

Matthew Weir O'Phinney's Blog: The light has not set on PHP

Jan Lehnardt's Blog: CouchDb Views with PHP

Anthony Ferrara: Programming With Anthony - Dependency Injection

Stefan Mischook's Blog: Object Oriented PHP Tutorial Updated

Felix Geisendorfer's Blog: A PHP developers guide to JavaScript - Part 1


Community Events

Don't see your event here?
Let us know!


php7 example podcast framework opinion unittest api series release community library xdebug voicesoftheelephpant introduction version laravel extension install language interview

All content copyright, 2015 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework