me
http://shinydevelopment.com

Hype

“Ruby on Rails is astounding. Using it is like
watching a kung-fu movie, where a dozen
bad-ass frameworks prepare to beat up the
little newcomer only to be handed their
asses in a variety of imaginative ways.”
Nathan Torkington

“Powerful web applications that
formerly might have taken weeks or
months to develop can be produced
in a matter of days.”
Tim O'Reilly

What is
Ruby on Rails?

Ruby Language
C# or VB.NET
on
Rails Framework
ASP.NET

Ruby

Ruby is
Object Oriented

> 2.next
=> 3
> “Hello”.reverse
=> “olleH”
> 2.class
=> Fixnum
> 2.class.class
=> Class

> 2.class
=> Fixnum
> 2.class.superclass
=> Integer
> 2.class.superclass.superclass
=> Numeric
> 2.class.superclass.superclass.superclass
=> Object

Ruby is Readable

> 5.times { print \"Hello \" }
Hello Hello Hello Hello Hello
> print “Stuff” unless x.nil?
=> Stuff
> [3, 5, 78, 2, 43].sort.reverse
=> [78, 43, 5, 3, 2]
> 2.weeks.from_now.utc
=> Wed Dec 27 11:25:06 UTC 2006

> [1, 2].empty?
=> false
> x.nil?
=> true

> arr = [5, 4, 3]
> arr.sort
=> [3, 4, 5] # arr is still [5, 4, 3]
> arr.sort!
=> [3, 4, 5] # arr is now [3, 4, 5]

Ruby is Dynamic

> Linguistics::use(:en)
> \"runs\".en.present_participle
=> \"running\"
> 5.en.ordinal
=> \"5th\"
> \"cow\".en.quantify(1005)
=> \"thousands of cows\"

> animals = %w{dog cow ox chicken goose goat
cow dog rooster llama pig goat dog cat cat dog
cow goat goose goose ox alpaca}
> puts \"The farm has \" + animals.en.conjunction
=> “The farm has four dogs, three cows, three
geese, three goats, two oxen, two cats, a
chicken, a rooster, a llama, a pig, and an
alpaca”

class ReverseString
def method_missing(method_name)
return method_name.to_s.reverse
end
end
> s = ReverseString.new
> s.Hello_World
=> “dlroW_olleH”

Rails

“Ruby on Rails is an opinionated framework
for developing web applications”

Convention
over
Configuration

Model Controller View

ActiveRecord ActionPack
Model View & Controller
ActiveSupport JavaScript Libraries
Prototype & Script.aculo.us
ActionMailer ActionWebService

Convention
over
Configuration

Table Class
groups Group
people Person
string.pluralize
ABC_usrdetails User
table_name_prefix “ABC_”
set_table_name “usrdetails”

Dynamic Scaffolding
and Validations
demo

Magic?

scaffold :customer

Ruby is Dynamic

Hey, have you
seen my new
Rails app?
I can
imagine!
*sigh*

script / generate

More Magic?

Routing

URL
http://localhost:3000/customer/show/2
Routes.rb
map.connect ':controller/:action/:id'

ActiveRecord

“The essence of an Active Record is a domain
model in which the classes match very closely
the record structure of an underlying database.
Each active record is responsible for saving and
loading to the database and also for any domain
logic that acts on the database”
Martin Fowler

ActiveRecord ActionPack
Model View & Controller
MySQL
PostgreSQL
ActiveSupport JavaScript Libraries
MS SQL - ADO Prototype & Script.aculo.us
MS SQL - ODBC
Oracle
ActionMailer ActionWebService
SQLite
DB2

class Customer < ActiveRecord::Base
end
>> Customer.column_names
=> [\"id\", \"name\", \"email\", \"notes\"]
>> Customer.columns_hash[\"id\"]
=> default=nil, text=false, null=false,
sql_type=\"int(11)\", primary=true,
name=\"id\", type=:integer, number=true

class Customer < ActiveRecord::Base
end
Customer.find(:all)
Customer.find(1)
Customer.find_by_email(‘bill@example.com’)
Customer.find_by_email_or_name(
‘bill@example.com’, ‘Ben’)

class Customer < ActiveRecord::Base
end
Customer.new do |c|
c.email = ‘bill@example.com’
c.name = ‘Bill’
c.save
end
Customer.delete(1)

ActiveRecord
Relationships

Describe the
relationship
“A customer has many orders and
an order belongs to a customer.”

has_many
belongs_to

Database
Relationships
demo

More Magic?

Ruby is Dynamic

Orders
id
Customers
customer_id
id
item
name
email quantity
notes unit_price

customer = Customer.find(params[:id])
customer.orders.create(params[:order])

Migrations
demo

Capistrano

What next?

Try Ruby
http://tryruby.hobix.com

Instant Rails
http://instantrails.rubyforge.org

Locomotive
http://locomotive.raaum.org/

SubSonic
http://www.codeplex.com/Wiki/View.aspx?
ProjectName=actionpackext
Castle Project
http://www.castleproject.org/

IronRuby

Newcastle Ruby on Rails
User Group

Thank You
dave.verwer@shinydevelopment.com