marckohlbrugge

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.

lazaronixon

<%= form_with model: citizen, class: "card flex flex-col gap", data: { controller: "form" } do |form| %>
  <div class="flex flex-col gap mb-2">
    <div class="flex flex-col gap-half">
      <% countries = Country.order(:name) %>
      <%= label_tag :country_id, "Country", class: "text-sm font-medium leading-none" %>
      <%= select_tag :country_id, options_from_collection_for_select(countries, :id, :name, citizen.country_id), include_blank: "Select one", class: "input", data: { action: "form#submit", form_submitter_param: "on_country_change" } %>
    </div>

    <div class="flex flex-col gap-half">
      <% states = State.where(country_id: citizen.country_id).order(:name) %>

kyrylo

# frozen_string_literal: true
# config/initializers/colorized_logger.rb

# This initializer adds color to the Rails logger output. It's a nice way to
# visually distinguish log levels.
module ColorizedLogger
  COLOR_CODES = {
    debug:   "\e[36m",  # Cyan
    info:    "\e[32m",  # Green
    warn:    "\e[33m",  # Yellow

jeremedia

require 'json'
require 'dry-schema'
require 'openai'
require 'ostruct'

module StructuredOutputs
  # Schema class for defining JSON schemas
  class Schema
    MAX_OBJECT_PROPERTIES = 100
    MAX_NESTING_DEPTH = 5

aviflombaum

class BaseClient
  class APINotFound < StandardError; end

  attr_reader :auth_strategy

  def initialize(auth_strategy: :headers, headers: {})
    @auth_strategy = auth_strategy
    @headers = headers
  end

josefarias

<nav class="flex justify-end w-full px-4">
  <%= dropdown do %>
    <%= dropdown_link_to "Profile", edit_user_registration_path %>
    <%= dropdown_link_to "Password", edit_account_password_path %>
    <%= dropdown_link_to "Social Accounts", social_accounts_path %>
    <%= dropdown_link_to "Accounts", accounts_path %>
    <%= dropdown_link_to "Billing", subscriptions_path %>
    <%= dropdown_link_to "Other Settings", other_settings_path %>

    <%= dropdown_button_to "Log out", destroy_user_session_path, method: :delete %>

markahesketh

class Admin::DataTable::CellComponent < ApplicationComponent
  def initialize(tag: :td, header: false, collapse: false, padding: true, numeric: false, centered: true, **args)
    @args = args

    @args[:tag] = tag
    @args[:class] = class_names(
      @args[:class],
      "text-end" => numeric,
      "w-1" => collapse,
      "text-center" => centered,

ryanb

<%# app/views/layouts/application.html.erb %>
...
<%= javascript_include_tag "locales/#{I18n.locale}", nonce: true %>

julianrubisch

require 'fileutils'

# Loop through all .jpg and .png files in the current directory
Dir.glob("{*.jpg,*.png}").each do |img|
  # Construct the output filename with .webp extension
  output_filename = "#{File.basename(img, File.extname(img))}.webp"

  # Execute ffmpeg command to convert the image
  system("ffmpeg -i '#{img}' '#{output_filename}'")
end

dhh

# THIS LINUX SETUP SCRIPT HAS MORPHED INTO A WHOLE PROJECT: HTTPS://OMAKUB.ORG
# PLEASE CHECKOUT THAT PROJECT INSTEAD OF THIS OUTDATED SETUP SCRIPT.
#
#

# Libraries and infrastructure
sudo apt update -y
sudo apt install -y \
	docker.io docker-buildx \
	build-essential pkg-config autoconf bison rustc cargo clang \