Stimulus

When you’re designing three features simultaneously, they start bleeding into each other. This time I added the following to a tournament bracket management app: FAB Feedback Button — floating button bottom-right → Telegram notification Role-Based Bracket Edit Permissions — tournament vs. friendly mode determines whether regular participants can edit the bracket Audit Log — records who changed what and when, with before/after data Each is simple on its own, but doing them together forced a lot of decisions: where to check permissions, where to write logs, and how much to expose in the UI. ...

When you think about implementing a theme system, the first instinct is to add conditional classes to every component. But what if you could swap the entire app’s color palette by changing a single CSS block — without touching any HTML? In Tailwind v4, that’s exactly what you can do. How Tailwind v4 Compiles Utility Classes Tailwind v4 compiles utility classes as CSS variable references: /* CSS generated by Tailwind v4 */ .bg-emerald-700 { background-color: var(--color-emerald-700); } .text-emerald-600 { color: var(--color-emerald-600); } .border-emerald-500 { border-color: var(--color-emerald-500); } bg-emerald-700 doesn’t hard-code #047857 — it references var(--color-emerald-700). Change that variable and every element using bg-emerald-700 updates instantly. ...

I was adding two features to the dashboard of a sports tournament management app: DnD card reordering — drag cards to rearrange sections (My Matches / Bracket / Match List) Card collapse/expand — fold away sections you don’t need Each sounds simple, but add Turbo Frame lazy loading and a requirement that layout state survives page reloads, and there’s more to think about than it first appears. 1. Choosing a DnD Library My first attempt used the native HTML5 Drag & Drop API directly — dragstart, dragover, drop. It works fine on desktop, but the problem is touch devices. The HTML5 drag API has incomplete support on iOS Safari; touch-dragging simply doesn’t work there. ...

Two problems solved while building a Rails 8 + Hotwire Native iOS app. Real-time notification badge — instantly update the app icon badge and bell button the moment a notification is created on the server Side menu navigation failure — correctly navigate to URLs that require dynamic parameters like a resource ID 1. Background Notification Badge Without setting the badge field in APNs push notifications, no number appears on the iOS app icon. And even when notifications are read, the badge doesn’t clear. ...

Running an iOS app built with Rails 8 + Hotwire Native, I hit a series of issues in a single day. What started as a small UI distortion spiraled into a full permission system redesign. Here’s the record. 1. Card Images Distorted in Mobile WebView Symptom Tournament discovery cards looked fine in a desktop browser, but badges and icons were squished inside the iOS app’s WKWebView (375px viewport). Root Cause The deployed view used a desktop-first layout (max-w-[1400px], responsive grid). The WKWebView rendered all of it in 375px, causing badge overlap. ...

두 개의 Rails 8 프로젝트를 병렬로 운영하다 보면 한쪽에서 공들여 만든 패턴이 다른 쪽에는 빠져있는 경우가 자주 생긴다. 기능을 구현할 때는 당장의 요구사항에 집중하다 보니 다른 프로젝트의 좋은 구현을 챙기지 못하는 것이다. 이번에 두 프로젝트를 나란히 놓고 비교하면서 빠진 부분을 서로 채워주는 작업을 했다. 주로 보안, PWA 경험, 에러 추적, 푸시 알림 인프라에 관한 내용이다. 비교 분석 방법 두 프로젝트의 주요 파일을 나열하고 대조했다. 확인 항목 ├── Gemfile (gem 목록) ├── config/initializers/ (설정 파일) ├── app/javascript/controllers/ (Stimulus 컨트롤러) ├── app/views/layouts/application.html.erb (레이아웃) ├── db/schema.rb (DB 스키마) └── ios/ (iOS 네이티브 설정) 결과적으로 아래 6가지를 양방향으로 이식했다. ...

Rails + ViewComponent + Lookbook 조합으로 컴포넌트 라이브러리를 만들 때, Stimulus 컨트롤러가 전부 스텁(빈 껍데기) 상태로 남아있는 상황을 맞닥뜨렸다. 13개 컨트롤러 중 3개만 동작하고 나머지 10개는 connect() {} 한 줄짜리였다. 이걸 전부 구현하면서 겪은 삽질을 정리한다. 구현 대상 총 11개 컨트롤러를 4단계로 나눠서 구현했다. Wave 컨트롤러 핵심 기술 1 TagInput, FileDropzone, CategoryTab DOM 조작, 드래그 이벤트 2 ScrollReveal, ScrollScale, VideoScrubbing, HorizontalScroll RAF 쓰로틀, IntersectionObserver, ResizeObserver 3 ScrambleText, RandomReveal RAF 애니메이션 루프, Fisher-Yates 셔플 4 ImageCarousel, CarouselContainer 드래그/터치, translateX 트랜지션 삽질 1: Lookbook 프리뷰에서 Stimulus가 아예 안 됨 가장 크게 막혔던 부분이다. 컨트롤러를 다 구현하고 Lookbook을 열었는데 아무 동작도 하지 않는다. 크롬 DevTools를 열어보니 data-controller 속성은 붙어있는데 Stimulus가 연결이 안 된 상태였다. ...