Ambiguous Sinatra

Ambiguous Sinatra
The story about diﬃculties,

surprises and workarounds using Sinatra for complex projects.

Story about walking through the mines ﬁeld

from the person who started learning Ruby from RoR framework.

Web project
1. Models, ORM, migrations
2. Routes
3. Assets pipeline
4. Forms, helpers
5. Console
6. Code load
7. Security, CSRF

Models
SinatraRails
ActiveRecord models

Models
Sinatra
Sequel
Rails
ActiveRecord models ActiveRecord /

Models
Sinatra
Sequel models
Rails
ActiveRecord models
dependent options dependent options
Sequel::Model.plugin :association_dependencies
plugin :association_dependencies, some_model: :destroy
counter cache

Models
Sinatra
Sequel models
Rails
ActiveRecord models
counter cache
dependent optionsdependent options
counter cache

Models
Sinatra
Sequel models
Rails
ActiveRecord models
counter cache
require 'sequel_postgresql_triggers'
dependent optionsdependent options
counter cache

ORM
Rails Sinatra
ActiveRecord, Arel

ORM
Rails Sinatra
ActiveRecord, Arel Sequel

ORM
Rails Sinatra
gem 'sequel_pg', :require=>'sequel'
overwrites the inner loop of the Sequel postgres adapter
row fetching code with a C version

ORM
Rails Sinatra
gem 'sequel_pg', :require=>'sequel'
plugin pg_json
plugin tree, rcte_tree

Migrations
Sinatra
rails db:migrate
Rails
ActiveRecord migrations

Migrations
Rails Sinatra
ActiveRecord migrations Sequel migrations
sequel -m relative/path/to/migrations DBrails db:migrate
namespace :db do
desc 'Run migrations'
task :migrate, [:ver] do |_t, args|
Sequel.extension :migration
require ‘my_app_lib’
if args[:ver]
puts "Migrating to version
#{args[:ver]}"
Sequel::Migrator.run(DB, 'db/
migrations', target: args[:ver].to_i)
else
puts 'Migrating to latest'
Sequel::Migrator.run(DB, 'db/
migrations')
end
end
end

Routes
Rails Sinatra
by design gem 'sinatra_more'
require 'sinatra_more'
class Application < Sinatra::Base
register SinatraMore::MarkupPlugin
register SinatraMore::RenderPlugin
register SinatraMore::WardenPlugin
register SinatraMore::MailerPlugin
register SinatraMore::RoutingPlugin
end

Routes
Rails Sinatra
by design gem 'sinatra_more'
• code generators for creating new sinatra applications (sinatra_gen)
• generic view and tag helpers (tag, content_tag, input_tag, …)
• asset tag helpers (link_to, image_tag, javascript_include_tag, …)
• full form helpers (form_tag, form_for, ﬁeld_set_tag, text_ﬁeld, …)
• full url named route support
• formatting extensions (relative_time_ago, js_escape_html, sanitize_html)
• simple 'mailer' support for sinatra (powered by pony)
• plug and play setup for the excellent Warden authentication system

development has stopped
sinatra_more

Assets pipeline
Rails Sinatra
by design gem 'sinatra-asset-pipeline'
require 'sinatra/asset_pipeline'
class App < Sinatra::Base
register Sinatra::AssetPipeline
… some code …
end
use sprockets-helpers

Forms, helpers
Rails Sinatra
by design, Action View

Forms, helpers
Rails Sinatra
by design, Action View gem 'forme'

Forms, helpers
Rails Sinatra
by design, Action View gem ‘forme’ + SLIM

Code load
Rails Sinatra
Autoloading and Reloading Constants Sinatra::Reloader
require "sinatra/reloader"config.cache_classes = false
require "sinatra/base"
require "sinatra/reloader"
class MyApp < Sinatra::Base
configure :development do
register Sinatra::Reloader
also_reload '/path/to/some/file'
dont_reload '/path/to/other/file'
after_reload do
puts 'reloaded'
end
end
... some code ...
end

Code load
Rails Sinatra
Autoloading and Reloading Constants
gem ‘rerun'config.cache_classes = false

Code load
Rails Sinatra
gem ‘rerun'config.cache_classes = false
rerun ruby ./app.rb

Code load
Rails Sinatra
config.cache_classes = false
require "sinatra/reloader"
gem ‘rerun'

Console
Rails Sinatra
require 'bundler/setup'
Bundler.require(:default)
require File.dirname(__FILE__) + "/lib/app_base.rb"
require File.dirname(__FILE__) + "/lib/app_other.rb"
map "/" do
run AppBase
end
map "/another" do
run AppOther
end
rails c irb -r ./app.rb
config.ru

Console
Rails Sinatra
rails c irb -r ./app.rb

Modular application
Rails Sinatra
by design config.ru

Modular application
Rails Sinatra
module MyApp
class App < Sinatra::Base
...some code...
use MyApp::Controllers::SomeController
...some code...
end
end
include MyApp
by design config.ru
app.rb

Specs
Rails Sinatra
rspec + turnip + factory_bot … sequel + factory_bot

Specs
Rails Sinatra
NoMethodError: undefined method `save!'
for #<Model:...>

Specs
Rails Sinatra
NoMethodError: undefined method `save!'
for #<Model:...>
a) call FactoryGirl.build(:symbol) to
build a Model instance and after call
that create()
b) add into FactoryGirl model
definition: to_create { |i| i.save }
or

Security, CSRF
Rails Sinatra
CSRF tokens, security updates gem 'rack_csrf'
require "rack/csrf"
configure do
use Rack::Session::Cookie, secret: "some secret"
use Rack::Csrf, raise: true
end
<form method="post" action="/tweet">
<%= Rack::Csrf.csrf_tag(env) %>
<input type="text" name="message"/>
<input type="submit" value="Submit a tweet!"/>
</form>

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