A partial presentation about Ruby on Rails which was made in 2008/9 ish

1. Ruby on Rails
A Complete Introduction

2. Good Morning
Welcome to Carsonified
.
a ve..
is is D
Th
Hi there!

3. Who am I?
Adam Cooke
I work at... which is part of
...
I have developed
and lots of other stuf
f

4. ... and you are?

5. So, the plan...

6. Introduction
The Rails Basics
Building a Blogging Engine
More Advancement
Testing
When things go wrong!
Deployments
Finishing up

7. re ...
a re he
you
1 Introduction What is Rails?
The MVC Pattern
Ruby Overview
RubyGems
Installing Rails
Components of Rails

8. What is Rails?

9. David Heinemeier Hansson
aka DHH
& the res
t of the R
ails Core
Team

10. [title]
[sub title]

11. Who’s using Rails?

13. The MVC Pattern
Model-view-controller

14. Controller
Model View

15. Rails routing happens here
Controller
Model View
Database Resource
Return to the browser

16. Ruby

17. Simple
Easy to write
Elegant

18. Everything is an object
Module String
Hash
Array Proc
Fixnum
Symbol Numeric

19. class Numeric
def plus(x)
self.+(x)
end
end
y = 5.plus 10 #=> 15

20. 5.times { puts “Hello!” }

21. Ruby Objects

22. Variables For example
Any plain, lowercase word a, my_variable and banana10
out...
Try it
>> blah
NameError: undefined local variable or method `blah'
>> string = “Hello World!”
=> “Hello World!”
>> string
=> “Hello World!”

23. Numbers For example
Integers - positive or negative 1, 41231 and
-68835
out...
Try it
>> 5 + 10
=> 15
>> 10 * 10
=> 100
>> 3.1 + 1.55
=> 4.65

24. Strings For example
Anything surrounded by quotes “Dave”, “123”and “My name
is...”
out...
Try it
>> my_quote = “My name is Dave!”
=> “My name is Dave!”
>> my_quote
=> “My name is Dave!”

25. Symbols For example
Start with a colon, look like words :a, :first_name and :abc123
out...
Try it
>> my_symbol = :complete
=> :complete
>> my_symbol
=> :complete

26. Constants For example
Like variables, with a capital Hash, Monkey and Dave_The_Frog
out...
Try it
>> MyMonkey = “James”
Yo
us
=> “James” hou
ldn
’t
>> MyMonkey = “Michael” ch
an
(irb):1: warning: already initialized constant MyMonkey ge
it,a
=> “Michael” ft
er
it ’s
be
en
se
t

27. Methods For example
The verbs! say_hello and close
out...
Try it
>> def say_hello
>> puts “Hello!”
>> end
>> say_hello
Hello!
=> nil

28. Method Args For example
Passing data to methods say_hello(name)
out...
Try it
>> def say_hello(name, age)
>> puts “Hello #{name}!”
>> puts “You are #{age}!”
>> end
>> say_hello(‘Keir’, 45)
Hello Keir!
You are 45!
=> nil

29. Method Args For example
Passing data to methods say_hello(name)
out...
Try it
>> def say_hello(name, age)
>> puts “Hello #{name}!”
>> puts “You are #{age}!”
>> end
>> say_hello(‘Keir’, 45)
Hello Keir!
You are 30!
=> nil

30. Arrays For example
A list surrounded by square brackets [1,2,3] and [‘A’,‘B’,‘C’]
out...
Try it
>> a = [1,2,3,4,5]
=> [1,2,3,4,5]
>> a
=> [1,2,3,4,5]
>> a[1]
=> 2
>> a[1, 3]
=> [2,3,4]

31. Hashes For example
A list surrounded by curly braces {1=>2, 3=>4} and
{:a => ‘Ant’,
:b => ‘Badger’}
out...
Try it
>> h = {:a => ‘Good’, :b => ‘Bad’}
=> {:a => ‘Good’, :b => ‘Bad’}
>> h(:a)
=> ‘Good’
>> h.keys
=> [:a, :b]
>> h.values
=> [‘Good’, ‘Bad’]

32. The Big One...

33. Classes
Anatomy of a class
class Person
attr_accessor :first_name, :last_name
end
p = Person.new
p.first_name = ‘Dave’
p.last_name = ‘Jones’
p.first_name #=> “Dave”

34. class Person
attr_accessor :first_name, :last_name
def initialize(first, last)
self.first_name = first
self.last_name = last
end
def full_name
[self.first_name, self.last_name].join(“ ”)
end
end
p = Person.new(‘Dave’, ‘Jones’)
p.first_name #=> “Dave”
p.last_name #=> “Jones”
p.full_name #=> “Dave Jones”

35. Ruby Gems
Your Ruby Package Manager

36. user@dev01:~# gem list
*** LOCAL GEMS ***
abstract (1.0.0)
actionmailer (2.1.0, 2.0.2, 1.3.6, 1.3.3)
actionpack (2.1.0, 2.0.2, 1.13.6, 1.13.3)
actionwebservice (1.2.6, 1.2.3)
activerecord (2.1.0, 2.0.2, 1.15.6, 1.15.3)
activeresource (2.1.0, 2.0.2)
activesupport (2.1.0, 2.0.2, 1.4.4, 1.4.2)
acts_as_ferret (0.4.1)
aws-s3 (0.4.0)
builder (2.1.2)
capistrano (2.3.0, 1.4.0)
cgi_multipart_eof_fix (2.5.0, 2.2)
cheat (1.2.1)
chronic (0.2.3)
codebase-gem (1.0.3)
daemons (1.0.10, 1.0.9, 1.0.7)
dnssd (0.6.0)
erubis (2.5.0)

37. gem install rails
gem remove rails
gem update rails

38. Useful Gems
The Rails Gems
rails actionmailer
actionpack
mongrel_cluster activerecord
capistrano activeresource
mysql activesupport
rails
rake

39. Components of Rails
Action Pack
Active Support
Active Record
Action Mailer
Active Resource

40. Action Pack
All the view & controller logic

41. Active Support
Collection of utility classes and library extensions

42. Active Record
The object relationship mapper

43. Action Mailer
E-Mail Delivery

44. 1 Introduction What is Rails?
The MVC Pattern
Ruby Overview
RubyGems
Installing Rails
Components of Rails ...
are here
you

45. re ...
a re he
you
2 The Rails Basics Development Tools & Environment
Generating an Application
The Directory Structure
Starting up the app
“RESTful Rails”
Routing & URLs

46. Active Resource
Connect with REST web services

47. Editors & IDEs

48. Database Browsers

49. Generating an App.
rails my_app_name
rails my_app_name -d mysql

50. app Contains the majority of your application specific code
config Application config - routing map, database config etc...
db Database schema, SQLite database files & migrations
doc Generated HTML API documentation for the application or Rails
lib Application-specific libraries - anything which doesn’t belong in app/
log Log files and web server PID files
public Your webserver document root - contains images, JS, CSS etc...
script Rails helper scripts for automation and generation
test Unit & functional tests along with any fixtures
tmp Application specific temporary files
vendor External libraries used in the application - gems, plugins etc...

51. app controllers Controllers named as posts_controller.rb
config helpers View helpers named as posts_helper.rb
db models Models named as post.rb
doc views Controller template files named as
posts/index.html.erb for the
lib PostsController#index action
log views/layouts Layout template files in the format of
application.html.erb for an
public application wide layout or posts.html.erb
script for controller specific layouts.
test
tmp
vendor

52. Starting the App
Running a Local Webserver
script/server

53. “RESTful Rails”
Representational State Transfer

54. HTTP Methods
GET POST PUT DELETE
READ CREATE UPDATE DESTROY

55. Resource: Customer
/customers GET index POST create
/customers/1234 GET show PUT update DELETE destroy
/customers/new GET new
/customers/1234/edit GET edit

56. Routing & URLs
config/routes.rb

57. domain.com/my-page
map.connect “my-page”, :controller => “pages”, :action => “my”
domain.com/customers (as a resource)
map.resources :customers
domain.com (the root domain)
map.root :controller => “pages”, :action => “homepage”
domain.com/pages/about
map.connect “pages/:action”, :controller => “pages”
domain.com/pages/about/123
map.connect “:controller/:action/:id”

58. Named Routes
rake routes

59. URL Helpers can use named routes (link_to, form for...)
<%=link_to ‘Homepage’, root_path%>
<%=link_to ‘Customer List’, customers_path%>
<%=link_to ‘View this Customer’, customer_path(1234)%>
<%=link_to ‘Edit this Customer’, edit_customer_path(1234)%>
<%form_for :customer, :url => customers_path do |f|...%>
A POST request - so will call the ‘create’ action

60. 2 The Rails Basics Development Tools & Environment
Generating an Application
The Directory Structure
Starting up the app
“RESTful Rails”
Routing & URLs
...
are here
you