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Ruby on Rails 3
- 1. Ruby on Rails 3 December 2010, BarCamp Saigon Nam Ho
- 2. About me Working at KMS Technology A member of ALT.NET Saigon group 2 @hotrannam
- 3. Ruby on Rails Web framework Ruby Model-View-Controller pattern Open source Created by David H. Hansson Maintained and developed by Rails core team 3
- 4. Ruby on Rails Full-stack framework Gives everything you need to create a web app Pretty much forces to use it Convention over configuration Common structures and naming conventions Don’t break conventions unless you really have to Don’t repeat yourself Code is written in just one place Easier for changes Testing 4
- 5. Confidential 5 Getting started
- 6. Starting a new app rails new barcamp 6
- 7. Starting a new app rails server 7
- 8. Starting a new app 8
- 9. 9 Quick and easy? More information: http://rubyonrails.org/download
- 11. Model Contains almost the application logic The heart of application Object Relational Mappings Active Record Data Mapper Mongo Mapper 11
- 12. Active Record rails g model Article rake db:migrate rails console The generated model class Table and Class name convention The generated database migration file
- 13. Active Record: CRUD article = Article.new article.title = “Rails 3” article.body = “Barcamp Saigon” article.save Create
- 14. Active Record: CRUD article = Article.first article = Article.find(id) article = Article.find_by_title(“Rails 3”) articles = Artcile.all() Lots of dynamic finders Read
- 15. Active Record: CRUD article.title = “Web development with Rails 3” article.save Update
- 16. Active Record: CRUD article.destroy Article.delete(id) Article.delete_all(“created_at < '2011-01-01'") Delete
- 17. Active Record: Scope A scope represents a narrowing of a database query articles = Article.published.where_title(“Rails”) Confidential 17
- 18. Active Record: Validation article.title = nil article.save article.errors.full_messages Confidential 18
- 19. Active Record: Custom Val. comment = article.comments.create :body => “Great article!” comment.errors.full_messages Confidential 19
- 20. Active Record: Relationship Confidential 20 1 : 1
- 21. Active Record: Relationship Confidential 21 1 : n
- 22. Active Record: Relationship Confidential 22 n : n
- 23. Active Record: Callbacks before_create after_create before_save after_save before_destroy after_destroy
- 24. Active Record: Observers When the Model is in a clutter by callbacks Hard to read the Model Observers are callbacks but in a separate class Good at readability Separation of concerns
- 25. Active Record: Db Migration rails g migration review rake db:migrate
- 27. Controller Handle requests and issue responses Pull data from the Model Choose the View to render An action is a public method and/or a corresponding method
- 28. Controller: Rendering responses A response is rendered with the render command Redirects are made with the redirect_to command An action can only render a response once
- 29. Controller: Filters before_filter after_filter around_filter Separation of cross-cutting concerns
- 30. Controller: Example rails g controller article
- 31. Routing Forward requests to action methods
- 32. Restful routes and resources
- 33. View
- 34. View .html.erb: used for rendering HTML .js.erb: used for AJAX functionality .xml.builder: used for RSS/Atom
- 35. View Helper methods to generate links, forms, and JavaScript, and to format text Partials are templates that render a part of a page Layouts a templates that contains common page elements
- 36. Action Mailer Bundler: manages dependencies etc. Confidential 36 Others
- 37. Confidential 37 Discussion! http://github.com/hotrannam/barcamp