#155 🚀 Faster Rails, Better Deployments, Smarter Ruby

Happy Wednesday!

Here is issue #155 of our newsletter, bringing you news and the best tools for your current or future Rails projects…

Modernizing & Scaling Rails

1. 🚀 Parallel Testing in Rails: Slow tests slowing you down? Aysan shows how to parallelize RSpec locally with worker-specific databases and isolated Redis resources, dramatically reducing feedback time during development.

2. ⚡ Rails Without Node.js: Tired of managing Node versions just to compile assets? Ariel explains how Bun can simplify your Rails setup while remaining compatible with existing npm workflows.

3. 🔧 Considering JRuby for your project? Ernesto shared this compatibility table, which maps supported JRuby, Ruby, and Rails versions, helping you quickly identify viable upgrade paths and supported combinations.

4. 🔄 Ruby Next for Gradual Upgrades: Want newer Ruby features without a full upgrade? Ruby Next lets teams modernize incrementally while maintaining compatibility with older Ruby versions.​

5. 🌎 The Rails Deployment Landscape in 2026: Germán explores today's Rails hosting ecosystem (Railway, Fly.io, Render, & more) and the tradeoffs developers should consider when choosing a deployment platform.​

Production Reliability & Performance

6. 🧪 Level up your test cases. Rishi explores common test-case blunders, such as missing assertions, testing only positive outcomes, and combining scenarios into a single test. Learn to write more effective, reliable tests and ensure robustness by breaking your tests.​

7. 📦 Streaming Large ZIP Files in Ruby: Need to zip large files without exhausting memory? Luiz demonstrates a streaming approach that keeps resource usage predictable. ​

8. 🚑 Production-Grade Rails Health Checks with Chuck Smith: Basic liveness checks aren't enough. The rails_health_checks gem adds dependency checks, parallel execution, and Prometheus metrics to help detect real application problems.

9. 🧠 Kino - A Ractor-Powered Ruby Server: Built with Rust and Ruby Ractors, Kino explores a future of highly parallel Ruby servers with impressive memory efficiency and performance benchmarks. Experiment with it today.

10. 📚 This Week in Rails: Catch up on the latest framework improvements, bug fixes, and community contributions landing in Rails. This week's roundup highlights recent changes across the Rails codebase and offers a quick way to stay current on what's coming next.

Architecture, Frameworks & Ruby Design

11. 🎯 Rethinking Ruby application architecture. Sharon Rosner explores Syntropy, an experimental framework built around explicit dependencies, file-based routing, and modular design. It's an intriguing look at how Ruby applications can become easier to test, understand, and maintain.

12. 📄 Progress Report. Tim Riley shares the latest progress on Hanami 3.0, including performance improvements, documentation updates, routing fixes, and preparations for the upcoming release candidate.

13. 💡Ruby Fundamentals: Two Ruby deep dives from Syed Aslam. First, he revisits SOLID principles through a Ruby lens, showing how they can guide design without fighting Ruby's dynamic nature. Then he explores Symbols vs. Strings, explaining when to use each and the tradeoffs involved.

14. 🌉 Blocks, Procs, and the '&' Bridge with Figsy: Learn how Ruby converts between blocks and Procs, and gain a deeper understanding of one of Ruby's most powerful language features.

Front-End & Developer Experience

15. 🖼️ Before/After Image Sliders with Stimulus: Learn how to build a reusable Stimulus controller for interactive before-and-after image comparisons in Rails applications.

16. ⭐ Tarik: Rails + Next.js SaaS Boilerplate & i18n: This open-source starter combines Rails 8 and Next.js 16 with authentication, payments, and multilingual support to accelerate new projects.

17. 💎 rubyterm: A full terminal emulator written entirely in Ruby. Explore an impressive project that implements X11 communication, rendering, and fonts without native extensions.

Security & Vulnerability Watch

18. 🚨 Ruby Security Advisories Roundup: Multiple Ruby security advisories were published this week, including vulnerabilities affecting nokogiri, katello, avo, concurrent-ruby, oj, and faraday. Review the advisories and upgrade affected dependencies promptly.

Check out our other articles on: ​​​​Ruby | Rails | Compatibility | ​​Upgrades​​​​ | ​​​​Tech Debt​​​ | AI​

Bookmark, share, or save them for later. We hope these links are helpful to you. 😉

Best,

The ​​​​​​FastRuby.io​​​​​​ Team