Everyday Rails
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The document provides an overview of the Ruby programming language and the Ruby on Rails framework, emphasizing their dynamic and object-oriented features. It discusses key concepts such as variables, arrays, hashes, control structures, and classes, along with examples of code snippets. Additionally, it touches on Rails' structure, including MVC architecture and routing, to illustrate the framework's functionality.
![:014 > 1.class
=> Fixnum
:015 > (2.2).class
=> Float
:016 > [].class
=> Array
:017 > "Politechnika Slaska".class
=> String
:018 > nil.class
=> NilClass
:019 > “abc” + “d”
=> “abcd”](https://image.slidesharecdn.com/everydayrails-150421030832-conversion-gate01/85/Everyday-Rails-16-320.jpg)
![Variables
a = 12
a.class # => Integer
a = “polsl”
a.class # => String
a = [‘a’, ‘b’, ‘c’]
a.class # => Array](https://image.slidesharecdn.com/everydayrails-150421030832-conversion-gate01/85/Everyday-Rails-18-320.jpg)
![Arrays and Hashes
a = [ 'ant', 'bee', 'cat', 'dog', 'elk' ]
a[0] # => "ant"
a[3] # => "dog"
# this is the same:
a = %w{ ant bee cat dog elk }
a[0] # => "ant"
a[3] # => "dog"](https://image.slidesharecdn.com/everydayrails-150421030832-conversion-gate01/85/Everyday-Rails-19-320.jpg)
![Arrays and Hashes
my_hash = {
building: ‘school’,
fruit: ‘orange’
}
puts my_hash[:building] # => ‘school’](https://image.slidesharecdn.com/everydayrails-150421030832-conversion-gate01/85/Everyday-Rails-20-320.jpg)
Everyday Rails
- 1. Everyday Rails brought by Blaze Hadzik and
- 2. Blaze Hadzik Ruby on Rails developer blazej.hadzik@netguru.co
- 3. netguru
- 5. Team
- 6. Poznan, Warsaw, Gdansk, Krakow Australia, India, America, Brazil
- 8. Workshops
- 9. 2 days
- 11. fun
- 12. recruitment
- 13. /ˈruː.bi/
- 14. ‘Programming languages must feel natural to programmers.’ Matz
- 15. Ruby is a dynamic, scripting, object- oriented language...
- 16. :014 > 1.class => Fixnum :015 > (2.2).class => Float :016 > [].class => Array :017 > "Politechnika Slaska".class => String :018 > nil.class => NilClass :019 > “abc” + “d” => “abcd”
- 17. variables type local instance class global constant example name @name @@name $name NAME you don’t have to specify variable type
- 18. Variables a = 12 a.class # => Integer a = “polsl” a.class # => String a = [‘a’, ‘b’, ‘c’] a.class # => Array
- 19. Arrays and Hashes a = [ 'ant', 'bee', 'cat', 'dog', 'elk' ] a[0] # => "ant" a[3] # => "dog" # this is the same: a = %w{ ant bee cat dog elk } a[0] # => "ant" a[3] # => "dog"
- 20. Arrays and Hashes my_hash = { building: ‘school’, fruit: ‘orange’ } puts my_hash[:building] # => ‘school’
- 21. Symbols LOW_PRIORITY = 0 HIGH_PRIORITY = 1 priority = HIGH_PRIORITY vs priority = :high Symbols are simply constants that you don’t have to predeclare and that are guaranteed to be unique.
- 22. Control structures if/else statements case statements while structure
- 23. Blocks
- 24. Idioms
- 25. Idioms a, b = 1, 2 a += b a # => 3 @a ||= 1 # @a = 1 if @a.nil?
- 26. Classes, objects
- 27. Classes, objects class School def initialize(name) @name = name end end school = School.new(‘polsl’) p school # =>#<School:0x007fa301836160 @name="polsl">
- 28. Class Attributes class School def initialize(name) @name = name end def name=(name) @name = name end def name @name end end
- 31. Rails
- 32. ‘It is impossible not to notice Ruby on Rails.’ Martin Fowler
- 33. Ruby is language Rails is framework
- 34. DRY
- 35. Service Objects
- 36. Decorators
- 38. REST
- 39. Structure
- 41. MVC
- 44. 127.0.0.1 - GET /index.html HTTP/1.0" 200 2326
- 45. get ‘/’, to: ‘welcome#index’
- 46. class WelcomeController < ApplicationController def index @posts = Post.all end end
- 47. class Post < ActiveRecord::Base end
- 49. class Post < ActiveRecord::Base end
- 50. class WelcomeController < ApplicationController def index @posts = Post.all end end
- 51. <ul> <% @posts.each do |post| %> <li> <%= post.title %> </li> <% end %> </ul>
- 54. Let’s code
- 55. Thanks