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Kaigi on Rails 2025

Imagine having a heart-to-heart with your favorite author.

Ages ago, when I was still a student, I taught myself Ruby on Rails for my senior thesis and fell in love. Fifteen years later, and I’ve used Rails at every job I’ve ever held in the tech industry. Fifteen years, and I still love Rails! But there’s something rotten at its core, and we share a name.

The web browser made for people, with love. Best privacy by default, unbiased ad-blocking, no bloat and no noise. Fully open source.

Private, fast, and honest web browser. Contribute to imputnet/helium development by creating an account on GitHub.

DELETE FROM users WHERE location = 'IRAN';. GitHub Gist: instantly share code, notes, and snippets.

Performance and Security for everyone

The fast and secure Load Balancer / API Gateway / Reverse Proxy with built-in service discovery, GeoIP, WAF, bot protection and much more - https://pingoo.io - pingooio/pingoo

I’ve spent 15 years of my life working on Bundler. When I introduce myself, people say “oh, the Bundler guy?”, and I am forced to agree. I didn’t come up with the original idea for Bundler (that was Yehuda). I also didn’t work on the first six months worth of prototypes. That was all Carl and Yehuda together, back when “Carlhuda” was a super-prolific author of Ruby libraries, including most of the work to modularize Rails for version 3.

自律的な AI エージェントを利用したコーディングでは、生成したコードを実行した結果からフィードバックを得て、コードを改善していく反復的なプロセスが重要です。しかし、フロントエンド開発では、生成したコードはブラウザ上で実行されるため、AI エージェントが直接コードを実行したり、ブラウザのコンソールログを取得したりすることは困難です。Chrome DevTools MCP はこの課題を解決するためのツールです。

Kaigi on Rails 2025 登壇資料

Why I'm rooting for HTML.

Redux may feel old in the React world, but its predictability, ecosystem, and DevTools keep it relevant. This article explores when Redux still makes sense and how it compares to modern state management alternatives.

A while ago, I decided to move away from full-stack React frameworks and use a client-server setup. That is, separate the backend and the frontend, each being a standalone app. So, here’s the stack I ended up choosing: * Backend: Hono + Bun + PostgreSQL + Zod + Prisma + TypeScript + Better Auth * Frontend: React

RSC route rendering without waterfalls.

The library for web and native user interfaces

JSON (JavaScript Object Notation) was supposed to be the universal data interchange format that would solve the compatibility nightmares of XML. What looks like astraightforward data format becomes a minefield of subtle incompatibilities, edge cases, and implementation quirks that can break your applications in unexpected ways.

A list to stay safe from NPM supply chain attacks

How enforced discipline in one language can teach you better patterns in another - lessons from crossing the Elm/React boundary

When you see a `useEffect` that updates a `useState` and returns a value, you might be looking for a `useSyncExternalStore`. This is my current vendetta.

Next.js Starter Kit. Contribute to kovrichard/catalyst development by creating an account on GitHub.

If you're working on a plain Ruby project and need an interactive console for debugging and exploration, this post covers how to set one up. A console allows quick experimentation with project classes, making it easier to test calculations, inspect data, and validate logic without writing temporary scripts. The setup is simple and provides a Rails-like experience for loading and interacting with the code.

Extension for Visual Studio Code - Manage git worktrees with ease

I recently discovered Git worktrees, and they've completely changed how I work with Git. I'd heard...

Why the U.S. Supreme Court case Cox v. Sony matters for developers and sharing updates to our Transparency Center and Acceptable Use Policies.

One of the significant improvements in PG18 is AIO. What are some basic tuning recommendations?

A step-by-step guide describing how to implement rate limiting in Postgres using advisory locks and counters

You probably don’t need a collection of specialty databases. Just use Postgres instead! Need a fast, reliable SQL-compliant RDBMS? Just use Postgres! Need to work with geospatial data? Just use Postgres! Handling semi- or non-structured documents? Just use Postgres! Generative AI embeddings? You’ve got it—just use Postgres! Written for software engineers and database pros, Just Use Postgres shows you how to get the most out of the powerful PostgresSQL database. In Just Use Postgres! you’ll learn how to: Develop generative AI, geospatial, and time-series applications Everything from transactional RDBMS services to specialized workloads Modern SQL including window functions, CTEs, and JSON data Implement full-text search B-trees, GIN, HNSW, expression, and more Postgres extensions Since its initial release in 1996, PostgreSQL, aka Postgres, has grown into the most popular and powerful full-featured open source RDBMS available. Just Use Postgres! takes a modern look at Postgres, exploring the database’s most up-to-date features for AI, time-series, full-text search, geospatial, and other application workloads.

Thank you to everyone who came to listen to my talk, "Postgres Partitioning Best Practices", at Euruko in Viana do Castelo, Portugal ...