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import { Controller } from "stimulus";
import { get } from "@rails/request.js";
import { PageSnapshot } from "@hotwired/turbo";
export default class extends Controller {
static values = { hoverTime: Number };
connect() {
this.element.addEventListener("mouseover", this.prefetch.bind(this));
this.element.addEventListener("touchstart", this.prefetch.bind(this));
}
import * as React from "react";
import { useMousePosition } from "~/hooks/useMousePosition";
/** Component to cover the area between the mouse cursor and the sub-menu, to allow moving cursor to lower parts of sub-menu without the sub-menu disappearing. */
export function MouseSafeArea(props: { parentRef: React.RefObject<HTMLDivElement> }) {
const { x = 0, y = 0, height: h = 0, width: w = 0 } = props.parentRef.current?.getBoundingClientRect() || {};
const [mouseX, mouseY] = useMousePosition();
const positions = { x, y, h, w, mouseX, mouseY };
return (
<div
import Foundation
enum Environment: String {
case development, staging, production
}
extension Environment {
static var current: Environment {
if isAppStore {
return .production
# MODEL
class Case < ActiveRecord::Base
include Eventable
has_many :tasks
concerning :Assignment do
def assign_to(new_owner:, details:)
transaction do
class Notifier < ActionMailer::Base
delivers_from '[email protected]'
def welcome(user)
@user = user # available to the view
mail(:subject => 'Welcome!', :to => user.email_address)
# auto renders both welcome.text.erb and welcome.html.erb
end
def goodbye(user)

The Unofficial 37signals/DHH Rails Style Guide

About This Document

This style guide was generated by Claude Code through deep analysis of the Fizzy codebase - 37signals' open-source project management tool.

Why Fizzy matters: While 37signals has long advocated for "vanilla Rails" and opinionated software design, their production codebases (Basecamp, HEY, etc.) have historically been closed source. Fizzy changes that. For the first time, developers can study a real 37signals/DHH-style Rails application - not just blog posts and conference talks, but actual production code with all its patterns, trade-offs, and deliberate omissions.

How this was created: Claude Code analyzed the entire codebase - routes, controllers, models, concerns, views, JavaScript, CSS, tests, and configuration. The goal was to extract not just what patterns are used, but why - inferring philosophy from implementation choices.