This document provides an introduction and overview of the key components and concepts in Ruby on Rails application development, including MVC architecture, models, controllers, views, assets, decorators, uploaders, layouts, routes, HTTP requests, status codes, locales, migrations, testing, and common developer services. It outlines the basic file and directory structure used in Rails and describes some of the main elements that make up a Rails application.

1. Rails Introduction
for those who have heard a lot about it
Rails IntroductionRails Introduction
application structure

2. MVC

3. Model
app/models/user.rb
class User < ActiveRecord::Base
end
class User < ActiveRecord::Base
attr_accessible :email, :password
validates :email, presence: true
end
class User < ActiveRecord::Base
attr_accessible :email, :password
validates :email, presence: true
has_many :blog_posts
end

4. Controller
app/controllers/users_controller.rb
class UsersController < ApplicationController
end
app/controllers/application_controller.rb
class UsersController < ApplicationController
def index
end
def show
end
def create
end
def edit
end
def update
end
def destroy
end
end

5. View
app/views/users/index.html.haml
Erb, HAML, Slim
http://html2haml.heroku.com
class UsersController < ApplicationController
def index
@users = User.all
end
end
­ @users.each do |user|
%h1= user.email
%h1= user.password
app/controllers/users_controller.rb
app/views/users/index.html.haml

6. assets
app/assets/javascripts
javascript, coffeescript
app/assets/stylesheets
CSS, SASS, LESS
app/assets/images
jpg, png, gif

7. decorators
app/decorators
gem 'draper'
class Student < ActiveRecord::Base
attr_accessible :first_name, :middle_name, :last_name
validates :email, presence: true
has_many :blog_posts
def fio
«#{first_name} #{middle_name} #{last_name}»
end
def with_first_name(first_name)
User.find_by_first_name first_name
end
end
app/models/student.rb

8. decorators
app/decorators
gem 'draper'
class Student < ActiveRecord::Base
attr_accessible :first_name, :middle_name, :last_name
validates :email, presence: true
has_many :blog_posts
end
class StudentDecorator < Draper::Base
decorates :member
def fio
«#{model.first_name} #{model.middle_name} #{model.last_name}»
end
def with_first_name(first_name)
User.find_by_first_name first_name
end
end
app/decorators/student_decorator.rb

9. uploaders
app/uploaders
gem 'carrierwave'
gem 'paperclip'

10. layouts
app/views/layouts/application.html.haml
%html
%head
%title SkyDance
= stylesheet_link_tag "bootstrap_and_overrides", :media => "all"
= stylesheet_link_tag "application", :media => "all"
= javascript_include_tag "application"
= csrf_meta_tags
%body
= yield

11. routes
config/routes.rb
Application.routes.draw do
root :to => "welcome#index"
match "admin" => "admins#login"
get "schedule" => "lessons#schedule"
resources :groups, :except => [:show, :index] do
member do
resources :lessons, :except => [:show, :index]
end
end
resources :teachers do
member do
resources :photos, :except => [:show, :index, :edit] do
collection do
get 'admins'
end
end
end
end
end

12. Http-requests
● GET
● POST
● PUT
● DELETE

13. http-statuses
● 200
● 404
● 403
● 500

14. locales
КИРИЛЛИЦА

15. migrations
db/migrate
$ rails g migration add_sleep_to_my_life
db/migrate/add_sleep_to_my_life.rb
class AddSleepToMyLife < ActiveRecord::Migration
def change
add_column :my_lifes, :sleep, :fuck_you
add_column :table, :column_name, :column_type
end
end
db/migrate
$ rails g migration add_sleep_to_my_life
db/migrate
$ rails g migration add_sleep_to_my_life

16. tests
TDD — test­driven development
http://travis­ci.org
http://coveralls.io
gem 'minitest'

17. tests
class UsersControllerTest < ApplicationController::TestCase
test «should get index» do
get :index
assert_response :success
end
end
test/functional/users_controller_test.rb

18. services
● http://travis­ci.org
● http://coveralls.io
● http://codeclimate.com
● http://github.com

19. thnx