Design Patterns

Design Patterns covers: Head First Design Patterns, Dive Into Design Patterns, The GoF Book. Master the Gang of Four patterns and their modern applications. Move from "I know what a Strategy pattern is" to "I see patterns as recurring solutions to recurring problems and I know when NOT to use them." Rails is a pattern-rich framework hiding in plain sight. before_action is Template Method. ActiveSupport::Notifications is Observer. scope is a Builder. Middleware is Chain of Responsibility. has_many through: is an Adapter. Rack itself is Strategy. Once you see patterns in Rails, you cannot unsee them — and you start recognizing when to apply the same patterns in your own application code.