This document provides an overview of building a simple Sinatra application with hot reloading and ActiveRecord integration. It recommends using shotgun for hot reloading and Padrino for ActiveRecord support. It also demonstrates how to use Redis with Ohm and includes links for further Redis documentation. The document advocates for a modular application structure with controllers, templates, and configuration in separate files rather than a single file application. It provides an example directory structure and configuration file to run the modular application with shotgun. Templates can be added using Slim or ERB templates rendered from controllers.

2. Супер быстрый прототип
# Gemfile
gem 'sinatra'
# app.rb
require 'sinatra'
get '/' do
'Hello world!'
end
# terminal
ruby app.rb
go to localhost:4567

3. Hot reload? EASY

4. SINATRA HOT RELOAD (SHOTGUN)
# gemfile
gem 'shotgun'
gem 'thin' (not necessary)
# terminal
shotgun app.rb --server=thin
go to localhost:9393

5. ActiveRecord?
use Padrino

6. Redis? Let’s do it!
# gemfile
gem 'ohm'
# app.rb
require 'ohm'
Ohm.redis = Redic.new('redis://127.0.0.1:6379')
get '/' do
Ohm.redis.call 'SET', 'Foo', 'Bar'
Ohm.redis.call 'GET', 'Foo'
end

7. WTF!? WHAT IS REDIS?
https://redis.io/documentation
https://redis.io/topics/quickstart

8. How to surprise your mentors?
Full guide:
https://www.oreilly.com/library/view/sinatra-up-and/9781449306847/ch04.html
http://rusrails.ru/rails-routing
https://blog.carbonfive.com/2013/06/24/sinatra-best-practices-part-one/
https://blog.carbonfive.com/2013/06/28/sinatra-best-practices-part-two/

9. Small guide
Your Architecture should look like
PLEASE! DON’T WRITE YOUR SINATRA
APPLICATION IN SINGLE FILE. IT SHOULD BE
MODULAR!

10. HOW?
# controllers/application_controller.rb
require 'sinatra'
class ApplicationController < Sinatra::Base
end

11. # controllers/users_controller.rb
class UsersController < ApplicationController
# index
get '/' do
'index'
end
#show
get '/:id' do
params[:id]
end
# update
# delete
# new
# create
end

12. How to run it?
# start config.ru
require 'sinatra/base'
Dir.glob('./{helpers,controllers}/*.rb').each { |file|
require file }
map('/users') { run UsersController }
map('/') { run ApplicationController }
# end config.ru
# terminal
shotgun config.ru --server=thin

13. Templates? YES!
Full info: http://sinatrarb.com/intro.html , ctrl+f Templates
gem ‘slim’
# application_controller.rb
class ApplicationController
set :views, File.expand_path(File.join( __FILE__, '../../views'))
…
end
# users_controller.rb
get '/' do
@some_variable = 123
slim :'/users/index'
end

14. # views/users/index.slim
.some_class_name
= @some_variable
in erb
<div class=’some_class_name’>
<%= @some_variable %>
</div>
in html
<div class=”some_class_name”>
123
</div>

15. Links
https://www.oreilly.com/library/view/sinatra-up-and/9781449306847/ch04.html
http://rusrails.ru/rails-routing
https://blog.carbonfive.com/2013/06/24/sinatra-best-practices-part-one/
https://blog.carbonfive.com/2013/06/28/sinatra-best-practices-part-two/