Ruby on Rails | rubyclub

ActiveHarness ActiveHarness is a Ruby framework for building production-grade LLM pipelines — with deep observability, consensus-based decisions, automatic fallbacks, and real-time cost and timing control. Made for Rails, works in plain Ruby too. ActiveHarness gem gives you the scaffolding to build multi-step pipelines where every agent is under full control: its inputs are directed, its outputs are observed, its errors are retried, and its cost is tracked. You define the logic; ActiveHarness handles the infrastructure.

👩‍💻 You've been lied to about self hosting... Coolify is an open-source & self-hostable Heroku / Netlify / Vercel alternative. It's your way to keep control over your infra while having all the benefits of a PaaS on top. https://coolify.io/

💻 Rails Reference App Library is a new curated collection of reference open-source Ruby on Rails applications The library showcases production-ready projects that follow Rails conventions and reflect battle-tested development practices. It's a valuable resource for developers learning Rails, as well as for LLMs that benefit from high-quality examples of real-world Rails applications.

🖼️ Security advisory: Possible leak of legacy API keys via improper cache configuration A CDN caching bug on RubyGems.org could hand one account’s API key to another person for up to an hour. If you signed in to RubyGems.org with a gem client older than v3.2.0, your key could have been exposed (the technical details are below). Currently, 18% of sign-ins through gem signin come from an affected version, and for the first several years of this bug, before we changed the client’s sign-in path in December 2020, it was every gem client.

Lexxy is the modern rich text editor for Rails. And now it has a beautiful site with lovely demo front and center. This is the editor we put in Basecamp 5. Such a big level up over Trix. From tables to syntax highlighting. lexxy.dev

Scaling Rails at Aura Frames: Splitting to 8 Primary DBs and Reaching #1 in the App Store A look at how Aura Frames scaled a Ruby on Rails app to 41 million requests per hour by splitting a single PostgreSQL database into eight and relying on Rails’ built-in multi-database support

All #RailsWorld 2026 speaker applicants have just been informed of the status of their talk, so please check your inboxes. We will begin sharing speaker announcements soon. In the meantime, you can still grab a ticket at: https://rubyonrails.org/world/2026

DHH finally approved the merge into Rails. Rails realtime can now run on any server, Vladimir’s PR for Action Cable adapterization was merged. The same Channels/Connection code now works with different runtimes — Falcon, Fibers, async-cable, and others. This is essentially the approach AnyCable has been using in production for years, and now it’s becoming part of Rails itself. Rails’ strength is once again in adapterization: layers hide implementation behind interfaces, so you can swap engines without rewriting your app — just plug in a different backend.

🚞 Ruby on Rails has taken over NextJS Revenue per startup is dramatically higher for Ruby on Rails (~$530k) than for React (~$40k) or Next.js (~$14k). Does this mean RoR founders build stronger businesses, or is Rails simply better at delivering on the whole “prompt to IPO” vision?

Spinel — Matz’s AOT Ruby Compiler That Could Reshape the Ruby Ecosystem Spinel has quickly become one of the most talked-about projects in the Ruby world. Created by Yukihiro Matsumoto, the new AOT compiler is already generating excitement among Ruby developers who see it as a potentially major step forward for the language’s performance and future. This deep dive explores what Spinel actually is, how its compiler pipeline works, which Ruby features it currently supports, where its limitations still exist, and why AOT compilation matters for Ruby in the first place. It also examines the origins of the project and the role Spinel could eventually play within the broader Ruby ecosystem as the language continues to evolve.

Uptime Kuma is an open source monitoring app you can easily deploy with Hatchboxio alongside your other apps. Here's how it deploy it: hatchbox.relationkit.help/articles/44-uptime-kuma

Spinel: Parsing your Ruby code into C Let’s quickly check out the Spinel gem and see how it works. Spinel is a new Ruby tool recently launched by Matz that can compile Ruby code into native C code.

Query command for database queries and more Query command for read-only database queries Adds rails query — a read-only database query command with structured JSON output. 💻 rubyonrails.org/2026/4/17/this-week-in-rails

Claude + Playwright MCP: The Last E2E Setup Your Rails Team Needs Stop fighting with flaky E2E tests and manual Capybara scripts. In this video, I’m showing you the "Blue Ocean" of Rails testing: integrating Claude Desktop with Playwright MCP to build agentic browser automation that actually understands your Rails architecture. We’re moving past generic AI tutorials. I’ll show you how to configure the Model Context Protocol (MCP) to work with Hotwire, Turbo Streams, and Devise giving you a "safety net" for legacy refactors and complex auth flows.

👩‍💻 DHH on the results of 37signals’ cloud exit: In 2023, the company spent $3,934,099 on AWS and other hosting. By 2026, hosting and support costs dropped to around $1M per year. Even accounting for hardware purchases, they’ll have saved about $4M by the end of the year — and going forward, roughly $3M annually Notably, the team didn’t grow at all: the same people who ran the cloud now run the on-prem infrastructure. Kubernetes was dropped, deployments moved to Kamal — and uptime even improved Why make this move? 37signals’ infrastructure went through several cloud phases: — first, moving from their own data centers to AWS ECS for Docker and expected cost savings — then trying Kubernetes on Google Cloud (GKE), which they left due to control plane issues — followed by a move to AWS EKS, where some systems remained until recently In the end, it became clear that the cloud introduced extra complexity, vendor dependency, and high costs. So the company decided to bring everything back in-house, onto their own hardware, and simplify the architecture.

💎 Is Ruby not for AI? Why Elixir is better The problem with using Rails to do it is everything ends up being executed inside of ActiveJobs. Those work fine for simpler web applications, but if you need to boot an agent that runs commands inside a docker container alongside other agents, jobs won't cut it.The kill feature in Elixir is supervisor trees. I can boot an agent and give it a docker container for its sandbox. If one crashes, Elixir can recover it and it's fine. Can't imagine easily doing that in Rails or Ruby. Scaling & monitoring it doesn't sound like fun either.

💎RSpec to Minitest: Migrating a Large Rails App in 5 Days 8 years of RSpec in a large Rails codebase: hundreds of tests, a complex FactoryBot DSL — and you end up reading the framework instead of the behavior. After a Ruby 4 upgrade, everything was migrated to Minitest + fixtures: 17 phases over 5 days, with both frameworks running in CI in parallel. Runtime dropped from ~400s to 82s, and flaky tests nearly disappeared. Unexpected bonus: Claude Code writes much more accurate tests without a DSL — fewer “hallucinations.”

The Complete Guide to Deploying Rails 8 with Kamal on Hetzner A complete guide to deploying a Rails 8 app with Kamal on a single server. Covers container setup, deployment flow, and how jobs, caching, and WebSockets run via the Solid stack.

🖼️ RubyGems/Bundler 4.0.9 has been released! blog.rubygems.org/2026/03/25/4.0.9-released.html This version moves toward a more performant pipeline. 👩‍💻 github.com/ruby/rubygems/pull/9381. This separation allows for optimized I/O operations and paves the way for faster, parallelized gem installations.

The Minimum Playwright Setup I Use for Rails E2E Testing If you’re testing a Ruby on Rails app and don’t want a massive, brittle E2E setup, this video is for you. In this video, I walk through the minimum Playwright setup I actually use for Rails end-to-end testing: What you do need (and what you don’t) How I structure E2E tests for small Rails teams Why keeping Playwright simple makes tests more reliable Where Playwright fits alongside Rails unit and system tests