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How I Hunted Down 23 N+1 Queries in a Rails App With Claude Code

TL;DR Our Rails app's p95 response time had crept from 280 ms to 1.4 s over a year, and nobody could say why. I paired with Claude Code for four day…

Replacing Perspective API in Discourse and Coral Talk before Dec 31

Two of the most common places Perspective API hides are a Discourse forum running the official discourse-perspective-api plugin, and a Coral Talk co…

What's New in RubyGems/Bundler 4.1, Part 1: override and prune

I'm Hiroshi Shibata (hsbt), a Ruby committer and the lead maintainer of RubyGems and Bundler. TL;DR RubyGems and Bundler 4.1.0.beta2 shipped on Octo…

Learning Go as a Ruby Developer #7: Finally Understanding Pointers

Pointers were probably one of the concepts I was most curious about when I started learning Go. Coming from Ruby, I don't normally think about memor…

I had Ruby running on a 2009 iPhone. Then I needed something to run.

This is a submission for the Hacktoberfest Weekend Challenge: Build for a Friend What I Built I had Ruby 4.0.7 running on a 2009 iPhone 3GS. I just…

Sidekiq to Kafka: A Mental-Model Map for Rails Developers

TL;DR: If you've spent years with Sidekiq, Kafka can look like "Sidekiq with extra steps". It isn't. Sidekiq moves jobs (commands to do something).…

CVE-2026-66066: an image upload path that reads /proc/self/environ

CVE-2026-66066: an image upload path that reads /proc/self/environ The shortest way to describe CVE-2026-66066 is that a framework default turned an…

Lazy loading, optimistic UI and more in Rails with Attractive.js

This is the last article of a series where I introduce Attractive.js 1.0.0 (in pre-release now). Attractive.js 1.0.0: interactive HTML without one l…

Why change-impact analysis is surprisingly hard in Ruby on Rails

Refactoring a mature Rails app often starts with a simple question: If I change this method, what else could break? In a smaller codebase, grep migh…

I wrote a programming language where you code in Polish. Here are 7 things it taught me about Ruby.

I write Ruby for a living, and about two years ago it started bothering me that I had no real idea what happens between typing x = 5 and the machine…

Installing Ruby on Ubuntu 24.04

Ruby is a dynamic, object-oriented programming language perfect for creating basic scripts to complex web applications. It offers a modern syntax fo…

KPIAssembler: stop hand-picking KPIs, let AI propose them

Text-to-SQL looks great in a demo. Then someone ships a conversion rate that JOIN s without ON , a revenue figure that double-counts through a fan-o…

Building a Radio Player with Ruby & WebForms Core

WebForms Core (WFC) is a web development technology owned and developed by Elanat . It provides a server-driven approach for building interactive we…

Your Webhook Endpoint is a Tiny Distributed System

If you want the Rails implementation version of this, Webhooks in Rails goes deeper on verification, durable receipt, idempotency, retries, jobs, te…

Fundamental analysis in Ruby, straight from SEC EDGAR

fundamentalista is a Ruby gem for fundamental analysis of listed companies. Version 0.6.0 is on RubyGems. Fundamentalista . configure { | c | c . ed…

Stop Writing Ruby Tests in JS Template Literals: Meet rspec-wasm

If you have built applications with ruby.wasm , you might have encountered a frustrating developer experience when writing unit tests. Testing Ruby…

Re-Organized configuration in Rails

A while back I wrote about organizing configuration in Rails . The idea was simple: drop YAML files into config/configurations/ and get namespaced c…

RubyCoder.ai: A Professional Network for the Ruby Community

Ruby has one of the most established developer communities in software, but the knowledge, tools and people that make up that ecosystem are often sp…

I Tested Rails Baseline by Leaving Architecture Out of the Prompt

Note: Rails Baseline is the production-ready Rails foundation I tested here. It gives a new SaaS application and the coding agents working in it cle…

Durable Objects without Cloudflare, on the database you already run

Tooling every AI software harness should have

When an agent writes the code, you stop reading every line. You can pretend otherwise for a while, but on any real codebase you end up skimming a 60…

I Could Hack My Own Rails App With One Hidden Input

I've been building RepBoard , a Rails app that gives freelancers a portable reputation profile — collect reviews from clients, share one professiona…

Fixing "g++ Not Found" When Debugging Rails in RubyMine on Fedora

Fixing "g++ Not Found" When Debugging Rails in RubyMine on Fedora TL;DR: If clicking "Debug" in RubyMine on Fedora fails to install debase because o…

When a build breaks, the bug fixes itself

When a build breaks, the bug fixes itself We stopped babysitting CI failures. Now a red build files its own bug — and an AI agent picks it up and sh…

Built a Blog App with Rails & PostgreSQL – Looking for Code Review!

Hey DEV community! 👋 I've been working on a Blog Application built with Ruby on Rails to practice backend architecture, clean code standards, and Ra…

When a String Assumption Broke Newsletter Tag Filtering in Ruby

A bug doesn't always need hundreds of lines of code to cause a real production problem. Sometimes, one assumption is enough. In this case, the assum…

Speeding Up (small) Ruby Hashes

Work-in-progress updates on my new book, Testing Rails from Scratch

Hello! It has been a couple of months since I announced my latest project, Testing Rails from Scratch: A practical, (mostly) out-of-the-box approach…

Tired of JS for simple UI in Ruby?

Meet web_ruby_ui — write reactive client-side SPAs using 100% pure Ruby via WebAssembly. Features state management & VDOM diffing. Give it a try…

massive-import - a batch processing library

Hi, Requesting review for a lib I wrote. https://github.com/laughing-orca/massive-import Not production ready. Wanted to discuss the algorithm and s…