Undervalued: The Most Useful Design Pattern
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Explores using value objects, data objects, and factory methods to decouple software components and improve testability. Demonstrates refactoring a tightly coupled XML feed generator by separating concerns through domain boundaries, transforming ActiveRecord models into simple data structures that isolate business logic from external APIs and database dependencies.
Table of contents
The Problem: An XML Product FeedCoupling and CohesionData [Transfer] ObjectsValue ObjectsImplementing Data and Value ObjectsFactory MethodsA Better Feed ImplementationHandling ChangeDrawing BoundariesFactory Method TipsSort: