Ruby On Rails Intro

•

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Netguru

Slides by Błażej Hadzik from @netguru, originally created for AKAI Camp #4 Backend meet-up.

Technology

/ˈruː.bi/ & Rails
AKAICamp #4: Backend
netguru.co

Blazej Hadzik, developer
netguru.co
netguru.co

Ruby is a language.
Rails is a framework.
netguru.co

Ruby is a dynamic, scripting,
object-oriented language...
netguru.co

:014 > 1.class
=> Fixnum
:015 > (2.2).class
=> Float
:016 > [].class
=> Array
:017 > "AKAI".class
=> String
:018 > nil.class
=> NilClass
:019 > “abc” + “d”
=> “abcd”
netguru.co

Ruby is open.
Ruby is people.
..so is Rails.
netguru.co

netguru.co
Google API
OAuth
RSpec
Faker
ActiveAdmin
Gems
Mandrill
RuboCop
CoffeeScript
Bootstrap
facebook
Devise
Twitter
Backbone.JS
Haml, Slim
Mongoid
AWS

What is the most
popular Ruby gem?
netguru.co

controllers
models
views
routes.rb, database.yml
Gemfile
netguru.co

netguru.co
1. What is Active Record?
2. Convention over Configuration
3. Active Record Models
4. CRUD
MVC

netguru.co
1. What is Active Record?
2. Convention over Configuration
3. Active Record Models
4. CRUD

netguru.co
1. What is Active Record?
2. Convention over Configuration
3. Active Record Models
4. CRUD
class Post < ActiveRecord::Base
belongs_to :user
end
class User < ActiveRecord::Base
has_many :posts
end
:001 > user = User.find(2)
=> #<User id: 2, name: ‘Blazej’>
:002 > user.posts
=> [#<Post id: 1, title: ‘abc’>,
user_id: 2>, #<Post id: 2, title:
‘akai’>, user_id: 2>]

netguru.co
1. What is Active Record?
2. Convention over Configuration
3. Active Record Models
4. CRUD
:001 > u = User.create(name: ‘XYZ’)
:002 > users = User.all
:003 > u.update(name: ‘Abc’)

controller
model view
browser
DB
routes
web server
netguru.co

netguru.conetguru.co
127.0.0.1 - GET /index.html HTTP/1.0" 200 2326

netguru.co
class WelcomeController < ApplicationController
def index
@posts = Post.all
end
end

netguru.co
class Post < ActiveRecord::Base
end

netguru.co
<ul>
<% @posts.each do |post| %>
<li>
<%= post.title %>
</li>
<% end %>
</ul>

netguru.co
<html>
…
<body>
…
<%= yield %>
…
</body>
</html

http://localhost:3000/
netguru.co
http://localhost:3000/

..write code, run specs and succeed.
netguru.co

netguru.co
Thanks
blazej.hadzik@netguru.co
netguru.co

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Ruby On Rails Intro

1. /ˈruː.bi/ & Rails AKAICamp #4: Backend netguru.co

2. Blazej Hadzik, developer netguru.co netguru.co

3. Ruby is a language. Rails is a framework. netguru.co

4. Ruby is a dynamic, scripting, object-oriented language... netguru.co

5. netguru.co

6. Metaprogramming netguru.co

7. netguru.co

8. netguru.co

9. netguru.co

10. Everything’s an object netguru.co

11. :014 > 1.class => Fixnum :015 > (2.2).class => Float :016 > [].class => Array :017 > "AKAI".class => String :018 > nil.class => NilClass :019 > “abc” + “d” => “abcd” netguru.co

12. Resources netguru.co

13. tryruby.org netguru.co ruby-warrior

14. Ruby on Rails netguru.co

15. Ruby is open. Ruby is people. ..so is Rails. netguru.co

16. netguru.co

17. netguru.co

18. Gems for everything netguru.co

19. netguru.co Google API OAuth RSpec Faker ActiveAdmin Gems Mandrill RuboCop CoffeeScript Bootstrap facebook Devise Twitter Backbone.JS Haml, Slim Mongoid AWS

20. What is the most popular Ruby gem? netguru.co

21. Structure netguru.co

22. controllers models views routes.rb, database.yml Gemfile netguru.co

23. Active Record netguru.co

24. netguru.co 1. What is Active Record? 2. Convention over Configuration 3. Active Record Models 4. CRUD MVC

25. netguru.co 1. What is Active Record? 2. Convention over Configuration 3. Active Record Models 4. CRUD

26. netguru.co 1. What is Active Record? 2. Convention over Configuration 3. Active Record Models 4. CRUD class Post < ActiveRecord::Base belongs_to :user end class User < ActiveRecord::Base has_many :posts end :001 > user = User.find(2) => #<User id: 2, name: ‘Blazej’> :002 > user.posts => [#<Post id: 1, title: ‘abc’>, user_id: 2>, #<Post id: 2, title: ‘akai’>, user_id: 2>]

27. netguru.co 1. What is Active Record? 2. Convention over Configuration 3. Active Record Models 4. CRUD :001 > u = User.create(name: ‘XYZ’) :002 > users = User.all :003 > u.update(name: ‘Abc’)

28. MVC netguru.co

29. controller model view browser DB routes web server netguru.co

30. netguru.co http://localhost:3000/

31. netguru.conetguru.co 127.0.0.1 - GET /index.html HTTP/1.0" 200 2326

32. netguru.co get ‘/’, to: ‘welcome#index’

33. netguru.co class WelcomeController < ApplicationController def index @posts = Post.all end end

34. netguru.co class Post < ActiveRecord::Base end

35. netguru.co

36. netguru.co class Post < ActiveRecord::Base end

37. netguru.co class WelcomeController < ApplicationController def index @posts = Post.all end end

38. netguru.co <ul> <% @posts.each do |post| %> <li> <%= post.title %> </li> <% end %> </ul>

39. netguru.co <html> … <body> … <%= yield %> … </body> </html