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Ruby on Rails
 

Ruby on Rails

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Given together with Miguel Vega at the Open Source Health Care Alliance Conference (OSHCA) 2007

Given together with Miguel Vega at the Open Source Health Care Alliance Conference (OSHCA) 2007

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    Ruby on Rails Ruby on Rails Presentation Transcript

    • Ruby on Rails By Miguel Vega [email_address] http://www.upstrat.com/ and Ezwan Aizat bin Abdullah Faiz [email_address] http://rails.aizatto.com/ http://creativecommons.org/licenses/by/3.0/
    • Who Am I?
      • Miguel Vega
      • 1 ½ years doing Ruby and Rails
      • PHP before then
      • Started a company (upstrat) just to have an excuse to use rails.
    • Who Am I?
      • Multiple Names
        • Ezwan Aizat Bin Abdullah Faiz
        • Aizat Faiz
        • aizatto
        • That scrubby looking guy on the screen
      • Student
      • Free and Open Source (FOSS) Enthusiast
      • Local FOSS Champion
        • http://foss.org.my
      • Web Developer
        • Ruby on Rails
        • LAMP
        • What is
        • Ruby on Rails?
        • Built on
        • Ruby Programming Language
        • Web Application Framework
    • + =
        • Wait!
        • Unexpected
        • Side Effect!
        • YOU =
    •  
        • Why Ruby?
    • A great man once said
        • Often people, especially computer engineers, focus on the machines .
        • They think,
        • “By doing this, the machine will run faster .
        • By doing this, the machine will run more effectively .
        • By doing this, the machine will something something something ”
    • They are focusing on machines . But in fact we need to focus on humans , on how humans care about doing programming or operating the application of the machines. We are the masters . They are the slaves .
    •  
        • By doing this,
        • the machine will something something something
        • We are the masters ,
        • they are the slaves
        • Yukihiro Matsumoto
        • Creator of Ruby
        • They are the SLAVES!
        • and I think we keep forgetting that
    •  
        • Ruby brings...
        • Large Increase in Productivity
        • How?
        • Non traditional programming style
    • Everything is an Object string = String .new 5 .times do puts " Hello World " end # Hello World # Hello World # Hello World # Hello World # Hello World
    • Everything is an Object 1 .upto( 100 ) { | i | puts i } # 1 # 2 # 3 # ... # 100 3.141_592_65 .ceil # 4 2.71828182845905 .floor # 2
    • Blocks (aka Closures) patients.each do | patient | if patient.ill? physician.examine patient else patient.jump_for_joy! end end
    • Blocks (aka Closures) hello = Proc .new do | string | puts " Hello #{string.upcase}" end hello.call ' Aizat ' # Hello AIZAT hello.call ' World ' # Hello WORLD
    • Open Classes class String def sanitize self .gsub( / [^a-z1-9]+ /i , ' _ ' ) end end puts " Ruby gives you alot of $$$ yo! " .sanitize # Ruby_gives_you_alot_of_yo_
    • Open Classes class Array def rand self [ Kernel ::rand(size)] end end puts %w[ a b c d e f g ] .rand # "e"
    • Open Classes class Array def shuffle size.downto( 1 ) { | n | push delete_at( Kernel ::rand(n)) } self end end puts %w[ a b c d e f g ] .shuffle.inspect # ["c", "e", "f", "g", "b", "d", "a"]
    • Open Classes class Numeric def seconds self end def minutes self .seconds * 60 end def hours self .minutes * 60 end def days self .hours * 24 end def weeks self .days * 7 end alias second seconds alias minute minutes alias hour hours alias day days alias week weeks end
    • Open Classes 1 .second # 1 1 .minute # 60 7.5 .minutes # 450.0 3 .hours # 10800 10.75 hours # 38700 24 .hours # 86400 31 .days # 2678400 51 .weeks # 30844800 365 .days # 31536000 Time .now # Thu May 10 12:10:00 0800 2007 Time .now - 5 .hours # Thu May 10 07:10:00 0800 2007 Time .now - 3 .days # Mon May 07 12:10:00 0800 2007 Time .now - 1 .week # Thu May 03 12:10:00 0800 2007
        • This is how Rails does its magic
        • and more...
        • What is Rails?
        • Convention over Configuration
        • MVC
        • Model View Controller
        • M VC
        • Model View Controller
    • ActiveRecord
      • Object Relation Mapping (ORM)
      • Class to Table, Object to Row
      • CRUD simple
      • Database Agnostic
    • ActiveRecord
    • ActiveRecord::Base#find class Patient < ActiveRecord :: Base end Patient .find( 1 ) # SELECT * FROM patients WHERE id = 1 Patient .find_by_name ' Miguel Vega ' # SELECT * FROM patients WHERE name = 'Miguel Vega' Patient .find_by_date_of_birth ' 1986-07-24 ' # SELECT * FROM patients WHERE date_of_birth = '1986-07-24' Patient .find_by_name_and_date_of_birth ' Miguel Vega ' , ' 1986-07-24 ' # SELECT * FROM patients WHERE name = 'Miguel Vega' AND date_of_birth = '1986-07-24'
    • ActiveRecord::Base#find Patient .count # SELECT COUNT(*) AS count Patient .find :all , :order => ' name DESC ' # SELECT * FROM patients ORDER BY name DESC Patient .find :all , :conditions => [ &quot; name LIKE ? &quot; , &quot; The other guy &quot; ] # SELECT * FROM patients WHERE name = 'The other guy'
    • Models class Patient < ActiveRecord :: Base end class Encounter < ActiveRecord :: Base end class Physican < ActiveRecord :: Base end
    • Associations class Patient < ActiveRecord :: Base has_many :encounters has_many :physicans , :through => :encounters end class Encounter < ActiveRecord :: Base belongs_to :patient belongs_to :physician end class Physican < ActiveRecord :: Base has_many :encounters has_many :patients , :through => :encounters end
    • Smart Defaults class Patient < ActiveRecord :: Base has_many :encounters , :class_name => ' Encounter ' , :foreign_key => ' patient_id ' has_many :physicans , :through => :encounters , :class_name => ' Physician ' , :foreign_key => ' physician_id ' end class Encounter < ActiveRecord :: Base belongs_to :patient , :class_name => ' Patient ' , :foreign_key => ' patient_id ' belongs_to :physician , :class_name => ' Physician ' , :foreign_key => ' physician_id ' end class Physican < ActiveRecord :: Base has_many :encounters , :class_name => ' Encounter ' , :foreign_key => ' patient_id ' has_many :patients , :through => :encounters , :class_name => ' Patient ' , :foreign_key => ' patient_id ' end
    • Or what people like to call Convention over Configuration
    • Associations p = Patient .find :first # SELECT * FROM patients LIMIT 1 p.encounters.count # SELECT COUNT(*) AS count FROM encounters WHERE (patient_id = 1) p.encounters.find :condition => [ ' date <= ? ' Time .now - 12 .weeks] # SELECT * FROM encounters WHERE date <= '2007-02-13 16:19:29' AND (patient_id = 1)
    • Validations class Patient < ActiveRecord :: Base has_many :encounters has_many :physicans , :through => :encounters validates_presence_of :name validates_inclusion_of :gender , :in => [ ' male ' , ' female ' ] validates_email_of :email validates_numericality_of :age validates_confirmation_of :password end
        • MV C
        • Model View Controller
    • ActionController
      • Separation of business logic and presentation
      • Ideally there should be no logic in the view
    • ActionController class PatientController < ApplicationController def index @patient = Patient .find :first @title = ' Patient Detail ' @homepage_title = &quot; Patient: #{@patient.name}&quot; end end
        • M V C
        • Model View Controller
    • View < html > < head > < title > <%= @title %> </ title > </ head > < body > < h1 > <%= @homepage_title %> </ h1 > < b > Patient: </ b > < dl > < dt > Name </ dt > < dd > <%= @patient .name %> </ dd > </ dl > <%= render :partial => ' patient_details ' %> </ body > </ html >
        • Why Rails?
        • Convention over Configuration
        • Easy SQL
        • ActiveRecord::Base#find
        • Easy SQL
        • Even through associations
        • RAD/RID
        • Rapid Application Development
        • Rapid Iterative Development
        • Testing Framework
        • Built in Unit, Function, Integration testing
        • Awesome Plugin Structure
        • Simpler and Nicer looking Code
        • Web 2.0 Ready
        • Tagging, Folksonomy, Ajax, REST
        • Simply RESTful
        • DRY
        • Don't Repeat Yourself
        • DRY
        • Don't Repeat Yourself
    • DRY
        • Saves time
        • Easier to manage
        • Reusable Code
        • Best of all...
        • You don't look like a
        • code monkey
        • Most Importantly
        • Because it's
        • FUN
        • Questions?
        • Thank you
        • amcvega@gmail.com - aizat.faiz@gmail.com
      Images used are from Tango Desktop Project http://tango.freedesktop.org/