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…
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Polymorphic Associations in PostgreSQL: One commentable_id Column or a Foreign Key per Table?
Disclosure: I build Schemity , a desktop ERD tool - this post is from our blog and uses it for the examples. TL;DR: A polymorphic association stores…
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…
Reducing role queries across dev.to role-heavy paths
This is part of casestudies for my Rails performance service. At a glance Problem The same users’ roles were queried repeatedly while each path eval…
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…
Upscaling guest photos with a local model instead of an API
I run Knipsmig , a QR-code photo sharing service for weddings and parties. Guests scan a code and upload straight from the phone, no app. Most of th…
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…
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…
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…
Performance Gains After a Rails Upgrade from 7 to 8
Between deprecation warnings, gem compatibility checks, and the inevitable late-night debugging session, the process can feel like a lot of effort f…
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…
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…
One Rails request, one event: production context for coding agents
Wide Events is a Rails gem that puts the production context a coding agent needs onto one OpenTelemetry root span per request or job. In one product…
3 Action Mailer Features I Didn't Know Existed
A few weeks ago I needed to check something in the Action Mailer docs, just a quick lookup. I ended up spending much more time there than expected a…
Ruby Reactor vs dry-transaction vs Trailblazer: Choosing a Ruby Workflow Library in 2026
Four ways to orchestrate business logic in Ruby. One map to find yours. You're building something that involves multiple steps. Charge a card, send…
Deploying Rails 8 on Render Free Tier: Bypassing the 512MB RAM and Read-Only Storage Limits
1. Introduction Hello from Japan! 🇯🇵 I am an active truck driver in Japan self-studying Python, leveraging my logistics domain knowledge to become a…
Rails already ships class_names. I built clsx anyway.
When I published a little gem for conditional CSS classes two years ago, the first comment was Adrien Poly asking the obvious thing: "What is the ma…
The four places a hand-rolled Ruby facade gives out
You don't need a gem to build a facade. This is a perfectly good one: class App def self . config = Rails . configuration def self . redis = REDIS_P…
Kiro for Ruby: Generating Rails Controllers and Models
You want to add a new resource to your Rails app. You know the drill — rails generate , tweak the migration, add validations, write the controller a…
Pagination: Always a "sort" (of) mistake [bugfix]
Pagination is a key component on web-applications that let users navigate through pages making easy to read/find records. Also, pagination is a grea…
Diagnosing a slow Rails page, layer by layer
"This page feels slow" is a vague bug report. Before changing any code, it helps to have a fixed way to locate where the time goes. A Rails request…
The webhook inbox pattern: stop writing this controller by hand
Every Rails app that takes Stripe webhooks has some version of this controller: def create payload = request . body . read sig_header = request . en…
The Silent Performance Killer in Rails: Understanding and Fixing N+1 Queries
If you've ever investigated a slow Rails endpoint, chances are you've encountered one of the most common performance problems in the Rails ecosystem…
Dynamic OG Images in Rails
Every blog post, product page, and profile in a Rails app deserves its own Open Graph image, the picture that shows up when someone shares the link…
Rails Performance Optimization: Fixing N+1 Queries with includes, preload, and eager_load
Originally published on Hashnode: https://railswithyashika.hashnode.dev/rails-performance-n-plus-one-queries When working with associations in Rails…
🇺🇸 3 Essential Gems to Eliminate Friction in Your Rails Workflow
Anyone who works with Ruby on Rails knows that, despite the framework being incredible for productivity, there are some classic workflow deficiencie…
Ruby on Rails End of Life: Rails 6.1 EOL, Rails 7.0 EOL — What's Still Supported in 2026
The Rails maintenance policy is lean by design: only the most recent minor version of the most recent two major versions receives security patches .…
SOLID Principles in Ruby on Rails
SOLID Principles in Ruby on Rails SOLID is not a Rails or Ruby concept. It's a set of five object-oriented design principles that apply to any langu…
Testing Turbo Frames in Rails Without a Browser
Turbo Frames are a great way to build interactive pages without writing custom JavaScript. But how do you test them properly? You can reach for syst…