L1
Honest Take — Before You Begin
Honest reflections on object-oriented design in Ruby
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Course · 6 lessons
~50 hr
Intermediate
The Ruby Object Model & OOP Mastery
Master object-oriented design in Ruby — not just "use classes and modules" but deeply understand SOLID, composition vs inheritance, polymorphism, and the design patterns that make code maintainable for years.
reading · we frame, you read MIT or the canonical
taught · we author, no canonical fits
↺ spirals back to earlier lessons
Course locked
Complete Ruby Language Mastery first.
This course unlocks once you've finished its prerequisite. Open prerequisite →
L2
Read: Practical Object-Oriented Design in Ruby (POODR) (Metz)
Approach: READ cover-to-cover, DO exercises
primary
Sandi Metz conference talks
locked
L3
Read: 99 Bottles of OOP (Metz & Owen)
Approach: READ cover-to-cover, CODE ALONG
primary
Sandi Metz conference talks
locked
L4
Read: Ruby on Rails Design Patterns
Approach: SELECTIVE: focus on patterns you do not already use
primary
Sandi Metz conference talks
locked
L5
Module Checklist
Work through each item before the checkpoint.
locked
L6
Checkpoint: Take a real controller or model from one of your projects...
Take a real controller or model from one of your projects (a work app or a personal project) that is messy. Refactor it using POODR principles: extract classes, reduce dependencie…
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6 lessons. Read in order; spiral back when you need to. By the end you'll have used the core ideas twice — once on the abstract, once on something you'll meet at work next week.