How to use Byebug to debug Ruby code

Check out How to use Byebug

Recommended Plan for Migrating from React.js To Opal Ruby & Glimmer DSL for Web

In a recent team retrospective meeting at my job, 5 team devs (all) voted for the future plan item “More use of Opal Ruby & Glimmer DSL for Web in the Rails Web App Frontend”. We are following a gradual rollout plan for migrating our React.js Frontend to Opal Ruby & Glimmer DSL for Web inside our Fintech Ruby on Rails web application.

Liskov Substitution Principle

Master the Liskov Substitution Principle in Ruby. Learn to spot structural violations, handle duck typing, and write better object-oriented code. Read more

Notes on `direct` and `resolve` in Rails routing, via Fizzy

Diving into Rails’ lesser-known direct and resolve routing features, explored through newly open-sourced app Fizzy. Focuses on how these APIs are used in a real production Rails app and why they matter. Read more

When we talk about programming or human languages, things get interesting

When we talk about programming languages or human languages, things become truly interesting. Read more

Introducing the Rails Superhero Card Generator

OmbuLabs and FastRuby.io introduces the Rails Superhero Card Generator, an AI-powered app that lets Rails developers create custom superhero cards featuring their own photo and a fun, coding-themed superhero name. The tool combines large language models and image generation, with a straightforward workflow built on Python/FastAPI, React, and LlamaIndex. Something just for fun!

Frontend Ruby on Rails with Glimmer DSL for Web (Accepted for RubyConf Austria 2026)

My talk proposal “Frontend Ruby on Rails with Glimmer DSL for Web” has been accepted at RubyConf Austria 2026. Glimmer DSL for Web is an SPA (Single Page Application) Framework for Rails that runs in Opal Ruby and has won a Fukuoka Prefecture Future IT Initiative 2025 award from Matz, the creator of Ruby. It provides a paradigm shift and the next stage of evolution in Frontend Development beyond JS libraries like Angular/Ember/React/Vue/Svelte by cutting down 12 months of JS work into 6 months of Ruby work every year…

Some presentations challenge you to slow down and think deeply.

This one did exactly that. Read more

What's new in Ruby 4.0

Ruby 4.0 will be released next week on Christmas day. This release brings a new JIT compiler, improvements to Ractors, a new mechanism to define namespaces called Ruby::Box, and a whole lot of other changes. Read more

Announcing Maquina Components — opinionated UI for Rails apps ERB partials + Tailwind

12 production-ready components: cards, tables, forms, navigation & more. Light/dark mode built-in. Read more

Customizing Omarchy with Ruby

If you are like me, and you prefer Ruby over bash, I wrote a little post about how I customize my Omarchy. Similar to how Typecraft does it with bash, but with Ruby.

Tangible Code: when Ruby becomes something you can see and touch.

The article looks at how Ruby can be used across the entire stack, from microcontrollers (PicoRuby) to real-time visual generation, turning abstract code into a physical, interactive experience. Read more

The Open-Closed Principle

Explore the Open-Closed Principle in Ruby through practical examples using inheritance and the Strategy pattern. Learn how to balance strict SOLID adherence with pragmatic design decisions. Read more

How LOAD_PATH works in Ruby

A basic guide on how LOAD_PATH and LOADED_FEATURES work in Ruby and how Bundler helps. Example from debugging a confusing ‘already activated gem’ error: Read more

Testing at scale eventually stops being a tooling problem and becomes a prioritizatio

This article explores Ninja Testing, a Ruby-driven approach presented at Ruby World Conference 2025, showing how to generate daily test suites using clear rules, history, and simple Ruby code. If you care about long-lived systems, this one is for you. Read more

Beautiful Rails confirmation dialogs (with zero JavaScript)

Upgrading the default data-turbo-confirm with a beautiful, native HTML dialog with animations Read more

Ruby Users Forum is launching soon!

We’re happy to announce that we’re building a discussion forum for you to connect with other Ruby users. Read more

Ruby Try Catch Explained: How Exception Handling Works in Ruby

Ruby’s exception handling mechanism is simple learn Ruby Try Catch

Sustainable Feature Testing in Rails with Cucumber

Learn how to use Cucumber in Rails to write feature tests that are clear, maintainable, and easy for your whole team to understand

subflag-rails — self-hosted feature flags with typed values

I’ve been working on a feature flag/dynamic config gem and just released a self-hosted option. Flags live in your database (ActiveRecord), no external service needed. Read more

Building LLM-Powered Applications in Ruby: A Practical Introduction

Ruby World Conference 2025 delivered an impressive amount of cutting-edge, valuable discussions. Read more

React + Rails in 2025: is there a “standard” way with SSR?

Exploring the World of Electronic Engineering with PicoRuby

I just published a new article inspired by Hayao Kimura’s talk “Exploring the World of Electronic Engineering with PicoRuby” from Ruby World Conference 2025. Read more

Requestkit: test and send webhooks and API requests in development

New OSS developer tool (built with Ruby):

Refactored Rails MCP Server from 12 tools to 4.

The insight: Every MCP tool definition consumes context tokens BEFORE your first question. Read more