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Rails 2010 Workshop
- 1. Ruby on Rails Workshop NYU ITP 2010 Presented by Daniel Tsadok
- 2. What is Ruby on Rails?
- 3. Why Ruby on Rails? Why not PHP?
- 4. Organization
- 5. Rails 2 vs. Rails 3
- 6. Ruby
- 7. Run irb in the terminal OR Create a text file (.rb) and run: ruby filename.rb
- 10. s = “Hello, World!” puts(s)
- 11. def say_hello(name) puts(“Hello, #{name}!”) end say_hello(“Daniel”)
- 12. #look Ma, no parentheses! def say_hello name puts “Hello, #{name}!” end say_hello “Daniel”
- 13. Everything is an Object
- 14. 1 + 1
- 16. class Fixnum alias :+ :plus end one = 1 one.plus(1)
- 17. Loop It Up
- 18. ar = [1, 2, 3] ar.length for i in ar puts i end
- 19. 3.times do puts “Hip, Hip, Hooray!” end
- 20. ar = [1, 2, 3] ar.length ar.each do |i| puts i end
- 21. ar = %w(Red Green Blue) puts ar.inspect ar.each {|w| puts w} puts ar[1]
- 22. h = { “ r” => “Red”, “ g” => “Green”, “ b” => “Blue” } h.keys h.each do |k, v| puts “#{k}: #{v}” end
- 23. Rails
- 24. Rails Principles
- 29. Controller
- 30. script/generate script/generate controller script/generate controller hello
- 31. app/controllers/hello_controller.rb def index render :text => “Hello!” end
- 32. Routes
- 34. map.connect ‘/hello’, :controller => ‘hello’, :action => ‘index’
- 35. map. hello ‘/hello’, :controller => ‘hello’, :action => ‘index’
- 37. map.connect ‘/hello/ :name ’, :controller => ‘hello’, :action => ‘index’
- 38. def index render :text => “Hello, #{params[:name]}!” end
- 40. map.connect ‘/guess/:name’, :controller => ‘guess’ --------------------------------- def index if params[:name] == “daniel” render :text => “You got it!” else render :text => “Not quite!” end end
- 41. map.connect ‘/guess/daniel’, :controller => ‘guess’, :action => ‘right’ map.connect ‘/guess/:name’, :controller => ‘guess’, :action => ‘wrong’
- 42. app/controllers/guess_controller.rb def right render :text => “You got it!” end def wrong render :text => “Not quite!” end
- 43. Filters
- 44. app/controllers/hello_controller.rb before_filter :check_id def index end protected def check_id if params[:id] != “Daniel” redirect_to “http://www.nyu.edu” end end
- 45. View
- 46. app/views/guess/right.html.erb --- <h1>Right!</h1> app/views/guess/wrong.html.erb --- <h1>It’s not <%= params[:name] %></h1>
- 47. Layouts
- 49. <html> <head> <title>Title Goes Here</title> </head> <body> <div id=“header”>…</div> <div id=“main”> <%= yield %> </div> <div id=“footer”>…</div> </body> </html>
- 50. app/controllers/guess_controller.rb class GuestController < Applica... layout “main” def right end def wrong end end
- 51. Model
- 52. ORM
- 53. mysql> select * from itp_students; +--------+--------+----------------+ | name | email | advisor | +--------+--------+----------------+ | Daniel | dmt321 | Shawn | | Bob | brb555 | DanO | +--------+--------+----------------+
- 54. student = ItpStudent.new student.name = “Daniel” student.email = “...” student.advisor = “Shawn” student.save
- 55. INSERT INTO itp_students (name, email, advisor) VALUES (‘Daniel’, ‘...’, ‘Shawn’);
- 56. student = ItpStudent.find_by_name “Daniel” student.name = “Daniel T” student.save
- 57. UPDATE itp_students SET name = ‘Daniel T’ WHERE name = ‘Daniel’;
- 59. script/generate model ItpStudent name:string email:string advisor:string
- 61. script/generate migration add_gpa_to_itp_student gpa:integer
- 62. rake db:migrate
- 63. $ script/console Loading development environment (Rails 2.3.5) >> ItpStudent => ItpStudent(id: integer, name: string, email: string, advisor: string, created _at: datetime, updated_at: datetime, gpa: integer)
- 64. >> student = ItpStudent.new >> student.name = “Daniel” >> student.save!
- 65. Validations
- 66. class ItpStudent < ActiveRecord::Base validates_presence_of :name end
- 67. >> student = ItpStudent.new >> student.valid? => false >> student.save => false >> student.save! ActiveRecord::RecordInvalid: Validation failed: Name can't be blank
- 68. Scopes
- 69. class ItpStudent < ActiveRecord::Base named_scope :passing => { :conditions => “gpa > 2” } named_scope :advised_by => {|x| :conditions => {:advisor => x} } end
- 70. >> ItpStudent.passing >> ItpStudent.advised_by ‘Shawn’ >> ItpStudent.advised_by(‘Shawn’).passing
- 72. class ItpStudent < ActiveRecord::Base has_many :classes belongs_to :itp_class end
- 73. >> student = ItpStudent.first >> student.classes.first
- 74. MOAR !!!
- 77. Thanks!
Editor's Notes
- Ruby on Rails is a web development framework that makes building complex web applications much easier. Ruby is the language in which Rails is built.
- http://itp.nyu.edu/~dmt321/bad-php.txt http://itp.nyu.edu/~dmt321/better-php.txt
- Rails 3 is on the verge of being released – it’s already out in beta. Some of the syntax, especially in routing, will be changed in Rails 3. But the fundamental concepts are the same.
- Comments
- table names, primary key, location of files
- EXAMPLES
- You can created Named Routes as well – this creates the hello_url and hello_path helpers.
- Adding parameter :name
- More sane way to do it Also notice that :action => “index” is optional
- Convention over configuration – Rails knows where to look for views.
- Convention over configuration – Rails knows where to look for layouts.
- Removed render :text code
- ORM is Object-Relational Mapping. It converts a row in a database table to an object.
- This is a lie. In fact Rails would not build a query like this.
- There are three different environments (more are possible). We will work primarily with the “development” environment.
- Notice the fields that were not in the migration file id - more convention over configuration
- Chained scopes
- Convention over configuration – looks for itp_student.advisor_id and classes.itp_student_id