Repository - DDD in Ruby on Rails by Paweł Strzałkowski - Visuality

Domain-Driven Design's core interest lays in the domain - the expression of purpose, behavior and goals. In a typical Ruby on Rails application, the domain elements are expressed using ActiveRecord objects. ActiveRecord ties the domain (logic and rules) with persistence (saving to and loading from a storage). In this article, I will show you how to free your domain from the ever-present ORM-driven development."A REPOSITORY lifts a huge burden from the client, which can now talk to a simple, intention-revealing interface, and ask for what it needs in terms of the model."— Eric Evans, Domain-Driven Design: Tackling Complexity in the Heart of Software.