Ruby On Rails Intro
Download as PPTX, PDF1 like1,356 views
Ruby on Rails is an open source web application framework written in Ruby. It was extracted from the Basecamp project in 2004 and emphasizes convention over configuration, don't repeat yourself (DRY) principles, and test-driven development (TDD). The document outlines the history of Rails, its philosophy, what will be learned in an introductory class including Ruby, the Rails framework, associations, and how learning will take place through exploration, live coding demonstrations, and in-class exercises with a focus on TDD. Prerequisites including dependencies like Ruby, Rails, and a database as well as tools for version control, editing, testing, and deployment are also covered.
![Ruby GemsA gem is a ruby library.gem –v 1.3.5 or highergem list[sudo] gem install](https://image.slidesharecdn.com/rubyonrailsintro-100406182836-phpapp02/85/Ruby-On-Rails-Intro-13-320.jpg)
![RailsRails is distributed as a Ruby gem.gem list rails 2.3.4 or higher[sudo] gem install rails](https://image.slidesharecdn.com/rubyonrailsintro-100406182836-phpapp02/85/Ruby-On-Rails-Intro-14-320.jpg)
![rakeRake is “make” for Ruby. Rails requires rake.Rake is distrubted as a gem.gem list rake0.8.7 or higher[sudo] gem install rake](https://image.slidesharecdn.com/rubyonrailsintro-100406182836-phpapp02/85/Ruby-On-Rails-Intro-15-320.jpg)
![HerokuSimple cloud hostingWeb sign-up for free account: heroku.com [sudo] gem install heroku](https://image.slidesharecdn.com/rubyonrailsintro-100406182836-phpapp02/85/Ruby-On-Rails-Intro-23-320.jpg)
![Safe from SQL injectionclass User < ActiveRecord::Base def self.authenticate_unsafely(user_name, password) find(:first, :conditions => "user_name = '#{user_name}' AND password = '#{password}'") end def self.authenticate_safely(user_name, password) find(:first, :conditions => [ "user_name = ? AND password = ?", user_name, password ]) end def self.authenticate_safely_simply(user_name, password) find(:first, :conditions => { :user_name => user_name, :password => password }) end end](https://image.slidesharecdn.com/rubyonrailsintro-100406182836-phpapp02/85/Ruby-On-Rails-Intro-42-320.jpg)
Ruby On Rails Intro
- 1. Ruby on RailsAn IntroductionSarah AllenBlazing Cloud
- 2. Ruby on Rails historyRuby on Rails was extracted from 37signals’ Basecamp by David Heinemeier Hansson (DHH)July 2004: first released as open source Feb 2005: first external commit rights Oct 2007: ships with Mac OS X v10.5 "Leopard”
- 3. Rails Philosophy Opinionated Convention over configuration DRY (Don't Repeat Yourself)less code means it's easier to maintain & modify Test Driven Development (TDD) Minimal code - maximal effect
- 4. What you will learnRubyLanguage conceptsLanguage syntaxCommon patternsRails Framework: creating web applicationsScaffoldModel, View, Controllers, RoutesSQL Queries, log files and debuggingAssociations
- 5. How you will learnExploration: experiment, playTest-Driven Development (TDD)Initially as a learning methodologyLater as a development methodologyAsk questionsLearn to find your own answers
- 6. Class StructureTalkLive Coding DemonstrationsIn-class coding
- 7. Prerequistes Core dependencies: Ruby, Rails, DBTools: vcs, IDE, test frameworks, deployment
- 9. Ruby Rails is a framework written in the Ruby language.Great Rails developers are great Ruby developers.
- 10. The Ruby LanguageOriginally by Yukihiro "Matz" Matsumoto“Ruby is designed for programmer productivity and fun, following the principles of good user interface design. He stresses that systems design needs to emphasize human, rather than computer, needs.”http://en.wikipedia.org/wiki/Ruby_(programming_language)#HistoryRuby 1.0 was released in 1996.
- 11. Ruby ruby -v1.8.6 or 1.8.7
- 12. Ruby Versionsruby -v1.8.6 – most common1.8.7 – some 1.9 features, very compatible1.9.1 – latest version, many VMs, Rails 2.3YARV (yet another Ruby VM) faster than MRIJRuby (Java)Rubinius (pure ruby) IronRuby (.NET)MacRuby, HotCocoaHotRuby/RubyJS (Flash/Javascript)
- 13. Ruby GemsA gem is a ruby library.gem –v 1.3.5 or highergem list[sudo] gem install
- 14. RailsRails is distributed as a Ruby gem.gem list rails 2.3.4 or higher[sudo] gem install rails
- 15. rakeRake is “make” for Ruby. Rails requires rake.Rake is distrubted as a gem.gem list rake0.8.7 or higher[sudo] gem install rake
- 16. DatabaseSQLite for class with sqlite3-ruby gemOther databases:MySQLPostgreSQLOracleSQL ServerSyBaseDB2
- 17. Tools Source Code Control with GitTerminal / git bash on windowsEditor / IDETest FrameworksHeroku for Easy Deployment
- 18. gitGit is for source code control.which git (mac, unix)git bash on windowsWhy Git?Most Ruby and Rails developers use gitEco-system of toolsModern Source Code Control
- 20. command lineMac/Unix TerminalGitBash on Windows
- 21. Editor / IDERubyMineTextMate (Mac-only)Komodo (free)
- 22. Test Frameworksgem list rspecrspec (1.3.0)rspec-rails (1.3.2)gem list cucumbercucumber (0.6.2)cucumber-rails (0.2.4)
- 23. HerokuSimple cloud hostingWeb sign-up for free account: heroku.com [sudo] gem install heroku
- 24. Prerequisites Core dependenciesRubyRuby GemsRails (gem)RakeDatabaseToolsGitTerminal / git bash on windowsTest Frameworksrspec, rspec-railscucumber, cucumber-railsHeroku (for deployment)
- 26. Lets get startedIRB: InteractiveRuBy>> 4>> 4 + 4
- 27. Everything is an object“test”.upcase“test”.class“test”.methods
- 28. Everything evaluates to something2 + 2(2+2).zero?
- 29. Methods are Messagesthing.do(4)thing.do 4thing.send “do”, 4
- 30. Operators are Methodsthing.do 4thing.do(4)thing.send “do”, 41 + 21.+(2)1.send "+", 2
- 31. Defining ClassesLet’s write some code!
- 32. Test-First LearningSimilar methodology to TDDwith a different purpose and workflowTeacher writes the testStudent implements the code
- 33. Test-Driven DevelopmentDesignFocus / Project ManagementCreation of Tests
- 34. Introduction to RspecDescribe the featureVerify expectation
- 37. MVCModel: ActiveRecordRepresents what is in the databaseView: ActionView, erbModel rendered as HTMLController: ActionControllerReceives HTTP actions (GET, POST, PUT, DELETE)Decides what to do, typically rendering a view
- 38. MVC
- 39. views<% @people.each do |person| %><tr> <td><%=h person.first_name %></td> <td><%=h person.last_name %></td> <td><%=h person.present %></td></tr><% end %>
- 40. View Exercise1. On the main people page a. Change “Listing people” to “My Class List” b. Remove the “Present” column 2. When you click “show,” the page should read “Joy McDonald was not present at class” or “Bob Smith was present at class”
- 41. ActiveRecordp = new Personp = new Person(:first => "May", :last => "Fong")p.savep.save!Person.create(:first => "May", :last => "Fong")Person.create!(:first => "May", :last => "Fong")
- 42. Safe from SQL injectionclass User < ActiveRecord::Base def self.authenticate_unsafely(user_name, password) find(:first, :conditions => "user_name = '#{user_name}' AND password = '#{password}'") end def self.authenticate_safely(user_name, password) find(:first, :conditions => [ "user_name = ? AND password = ?", user_name, password ]) end def self.authenticate_safely_simply(user_name, password) find(:first, :conditions => { :user_name => user_name, :password => password }) end end