This document outlines the steps for creating a new Rails application with PostgreSQL, including setting up necessary gems, generating user models with Devise, and configuring routes. It also provides instructions for deploying the application to Heroku and configuring Unicorn for handling web requests. Additionally, it includes code snippets for setting up Sinatra alongside Rails.

1. Rails Workshop
@alexruperez

2. Create a new app
rails -v
rails new workshop --database=postgresql
cd workshop

3. Gemfile
gem 'rails_12factor'
gem 'less-rails'
gem 'twitter-bootstrap-rails'
gem 'devise'
gem 'therubyracer' (uncomment)
gem 'unicorn' (uncomment)

4. Run the new app
bundle install
bundle exec rake db:create
bundle exec rake db:migrate
rails s

5. Generate devise models
rails generate devise:install
rails generate devise User
Add ''config.action_mailer.default_url_options =
{ host: 'localhost', port: 3000 }'' to config/
environments/development.rb
bundle exec rake db:migrate

6. Apply Twitter Bootstrap
rails generate bootstrap:install less
rails g bootstrap:layout application
rails generate scaffold_controller User
Add ''before_action :authenticate_user!'' to app/controllers/
users_controller.rb
rails g bootstrap:themed Users
Add ''resources :users'' and ''root ‘users#index’'' to config/routes.rb

7. Upload to Heroku
git init
git add .
git commit -am 'First commit'
heroku git:remote -a YOUR_HEROKU_APP
git push heroku master
heroku run rake db:migrate

8. web.rb
require 'sinatra'
set :bind, '0.0.0.0'
get '/' do
"Hello world!"
end

9. config.ru
require './web'
run Sinatra::Application

10. config/unicorn.rb
worker_processes Integer(ENV["WEB_CONCURRENCY"] || 3)
timeout 15
preload_app true
before_fork do |server, worker|
Signal.trap 'TERM' do
puts 'Unicorn master intercepting TERM and sending myself QUIT instead'
Process.kill 'QUIT', Process.pid
end
defined?(ActiveRecord::Base) and
ActiveRecord::Base.connection.disconnect!
end
after_fork do |server, worker|
Signal.trap 'TERM' do
puts 'Unicorn worker intercepting TERM and doing nothing. Wait for master to send QUIT'
end
defined?(ActiveRecord::Base) and
ActiveRecord::Base.establish_connection
end

11. Procfile
web: bundle exec unicorn -p $PORT -c ./config/unicorn.rb

12. Thanks!
@alexruperez