The Ruby and Rails community linklog
Made a library? Written a blog post? Found a useful tutorial? Share it with the Ruby community here or just enjoy what everyone else has found!
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Yesterday
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. https://andymaleh.blogspot.com/2025/12/recommended-plan-for-migration-from.html
Liskov Substitution Principle
Master the Liskov Substitution Principle in Ruby. Learn to spot structural violations, handle duck typing, and write better object-oriented code. [more inside]
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. [more inside]
When we talk about programming or human languages, things get interesting
When we talk about programming languages or human languages, things become truly interesting. https://rubystacknews.com/2025/12/19/parsing-taiwanese-like-code/ [more inside]
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! https://www.ombulabs.ai/blog/multi-modal-card-generator.html
Frontend Ruby on Rails with Glimmer DSL for Web (International Conference Proposal)
I have submitted this talk to an international Ruby conference. 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… https://andymaleh.blogspot.com/2025/12/frontend-ruby-on-rails-with-glimmer-dsl.html
Some presentations challenge you to slow down and think deeply.
This one did exactly that. [more inside]
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. [more inside]
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. [more inside]
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. https://greg.molnar.io/blog/customizing-omarchy/
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. [more inside]
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. [more inside]
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: [more inside]
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. [more inside]
Beautiful Rails confirmation dialogs (with zero JavaScript)
Upgrading the default data-turbo-confirm with a beautiful, native HTML dialog with animations [more inside]
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. [more inside]
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 https://danielabaron.me/blog/sustainable-feature-testing-in-rails-with-cucumber/
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. [more inside]
Building LLM-Powered Applications in Ruby: A Practical Introduction
Ruby World Conference 2025 delivered an impressive amount of cutting-edge, valuable discussions. [more inside]
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. [more inside]
Requestkit: test and send webhooks and API requests in development
New OSS developer tool (built with Ruby): https://railsdesigner.com/new-requestkit/
Refactored Rails MCP Server from 12 tools to 4.
The insight: Every MCP tool definition consumes context tokens BEFORE your first question. [more inside]
Interviewing Ruby Software Engineers Is Easier Than Ever in 2025!
New developments in recent years have made it super-easy to interview Ruby Software Engineers and tell the good ones from the bad ones in 2025: https://andymaleh.blogspot.com/2025/12/interviewing-ruby-software-engineers-is.html
