Michael van Rooijen mrrooijen

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.

A half-hour to learn Zig

This is inspired by https://fasterthanli.me/blog/2020/a-half-hour-to-learn-rust/

Basics

the command zig run my_code.zig will compile and immediately run your Zig program. Each of these cells contains a zig program that you can try to run (some of them contain compile-time errors that you can comment out to play with)

Server Price Breakdown: DigitalOcean, Amazon AWS LightSail, Vultr, Linode, OVH, Hetzner, Scaleway/Online.net:

Permalink: git.io/vps

$5/mo

Provider	Type	RAM	Cores	Storage	Transfer	Network	Price

	#! /bin/sh

	email="me@example.com"
	domains="example.com,*.example.com"
	cloudflare_email="me@example.com"
	cloudflare_api_key="me-api-key"

	# END CONFIG

	brew install certbot

	docker run -it --rm --name certbot \
	-v $(pwd)/ssl:/etc/letsencrypt \
	-v $(pwd)/ssl:/var/lib/letsencrypt \
	certbot/certbot certonly \
	--server https://acme-v02.api.letsencrypt.org/directory \
	--manual \
	--preferred-challenges dns \
	-d *.example.com \
	-d example.com

	{
	"AF": "Afghanistan",
	"AX": "AlandIslands",
	"AL": "Albania",
	"DZ": "Algeria",
	"AS": "AmericanSamoa",
	"AD": "Andorra",
	"AO": "Angola",
	"AI": "Anguilla",
	"AQ": "Antarctica",

	defmodule Party.Clock do
	use GenServer

	def start_link do
	case GenServer.start_link(__MODULE__, [], name: {:global, __MODULE__}) do
	{:ok, pid} ->
	{:ok, pid}
	{:error, {:already_started, pid}} ->
	IO.puts("Already started!!")
	Process.link(pid)

	Host *
	ServerAliveInterval 60
	AddKeysToAgent yes
	UseKeychain yes
	IdentityFile ~/.ssh/id_rsa

	#! /bin/sh

	if [ "$1" == "" ]; then
	echo ""
	echo "SSL Certificate Generator (self-signed, requires openssl)."
	echo ""
	echo " Usage:"
	echo ""
	echo " gencert <days> # Produces server.key and server.crt"
	echo ""