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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.

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#! /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

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require "active_record"

namespace :db do

  db_config       = YAML::load(File.open('config/database.yml'))
  db_config_admin = db_config.merge({'database' => 'postgres', 'schema_search_path' => 'public'})

  desc "Create the database"
  task :create do
    ActiveRecord::Base.establish_connection(db_config_admin)

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WIFI:S:<SSID>;T:WPA;P:<PASSWD>;;

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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

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How to enable SSL with [Redis] ([Ruby Driver]) on [RedisLabs].

Typically, this is how you'd connect to Redis:

Redis.new(url: ENV["REDIS_URL"])

Where REDIS_URL uses the following format:

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Verify the microcode version prior to updating:

dmesg | grep microcode

Update your package list and install the following packages:

apt update
apt install microcode.ctl intel-microcode

Reboot and run the following command again to verify the new microcode is in effect:

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Verify your current kernel version:

uname -r

To update the Linux kernel, select a version from the following URL:

http://kernel.ubuntu.com/~kernel-ppa/mainline/

For example v4.14.13:

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

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# Install Docker
curl -fsSL https://get.docker.com/ | sh

# Run Rancher
docker run -d                      \
  --name=rancher                   \
  --restart=always                 \
  -v /var/lib/mysql:/var/lib/mysql \
  -p 8080:8080                     \
  rancher/server:stable