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One of the most frequent code smells in Rails is an excessive use of inheritance. A serious drawback from using inheritance to achieve polymorphism is the implicit coupling it creates between parent and child classes.

A production guide to building multi-tenant SaaS with Rails 8 — subdomain routing, custom domains, and automatic SSL with Caddy's on-demand TLS.

RSpec model specs: 6 minutes for 3,780 examples. Minitest model tests: 66 seconds for 9,835 tests. Both parallel. I built a 6-gate multi-agent pipeline in Claude Code to make the migration work.

An Open Source Claude Code skill based on our 60,000+ hours of Rails upgrade experience. Learn how our opinionated methodology teaches Claude Code to upgrade Rails, fast.

rbenv vs rvm vs asdf vs mise vs chruby vs direnv

In this article, we will look at how the LinkedIn engineering team rebuilt the Feed and the challenges they faced.

Rails 8.1 adds Rails.app.creds to unify ENV variables and encrypted credentials behind a single API.

Most AI SEO advice is unproven. We tested what ChatGPT, Claude, and Perplexity actually read on our own site. Six LLM visibility techniques that worked, eight that didn't, and the metrics to tell the difference.

Let’s imagine we have a database table of Pokémon, like so1:

Every month I walk to the end of my driveway and stuff my mailbox with a tall stack of letters. Actually, I have to repeat this process a few times, because sta...

An overview of what's new in language features, frameworks, runtimes, build tools, testing, and more.

I'm running 44 AI agents across multiple projects. Each one is just a model pointed at a folder.

Learn how to build UI patterns for modal windows and prompts using the <dialog> and popover web features.

Lightweight date picker, event scheduler, and timeline components for JavaScript. Works with React, Vue, and Angular. Free and open source.

AI's real efficiency comes from picking the right problem to solve. Our consulting team shares how to find the AI use case worth a real solution.

A story of validating product demand on a $2K budget with 128 cold-traffic signups, an A/B winner at 95% confidence, and a sequenced playbook founders can run themselves.

Rails has better tools than html_safe for building HTML safely in your helpers and views.

Build per-plan API rate limits (free, pro, enterprise) using Rails 8.2's dynamic rate_limit options, with no Rack::Attack or custom middleware.

… and check why 5600+ Rails engineers read also this

This is the story of how our Developer Productivity team extended and rolled out rubyfmt, our Rust-based zero-config, ultra-fast autoformatter across the world's largest Ruby codebase.

Stop interpolating CSS classes with ternaries in your ERB templates.

A six-phase guide to migrating a Rails app from Sprockets to jsbundling-rails + esbuild. Covers jQuery, Bootstrap, Docker, gotchas, and lessons learned.

Here's how you can have a PaaS-like experience while keeping all of your services in Europe with AppSignal and Hatchbox.

The next level for nested forms with Stimulus: add edit, delete and drag-and-drop reposition features.

Redesign prep matters, but what does it actually look like when AI is in the room?