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Ruby On Rails

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Ruby on rails, components, ActiveRecord, Routing

Ruby on rails, components, ActiveRecord, Routing

Published in: Software, Technology

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Transcript

  • 1. Ruby on Rails Mehmet Beydogan 2014
  • 2. Ruby on Rails Mehmet Beydogan 2014
  • 3. Why Ruby? “Ruby is natural more than simple”
  • 4. Everything is an object 5.times do puts “Hello World” end Hello World Hello World Hello World Hello World Hello World 5.class => Fixnum=> Fixnum nil.class => NilClass
  • 5. Ruby Blocks patients.each do |patient| if patient.ill? physician.examine patient else patient.jump_for_joy! end end You can group a set of instructions together
  • 6. Open Classes class String def write_size self.size end end size_writer = "Tell me my size!" puts size_writer.write_size In Ruby, classes are never closed, you can always add methods to an existing class.
  • 7. Method Missing class Dummy def method_missing(m, *args, &block) puts "There's no method #{m}" end end Dummy.new.anything method_missing is in part a safety net: It gives you a way to intercept unanswerable messages and handle them gracefully
  • 8. Method Missing User.find_by_name User.find_by_email You can use regular expressions to more dynamic classes
  • 9. Ruby on Rails
  • 10. Rails -Convention Over Confuguration -DRY – Dont Repeat Yourself -MVC Princibles
  • 11. Convention Over Confuguration Model: User Table: users Controller: users_controller
  • 12. MVC
  • 13. REST -simplifies component implementation -reduces the complexity of connector semantics,
  • 14. Rails Components -Active Record -Database Migrations -Active Record Validations -Active Record Callbacks -Active Record Assocations Model Layer -Action View -Layouts & Partials -Rendering View Layer -Controller Overview -Routing Controller Layer
  • 15. Rails Components -i18n -Action Mailer -Asset Pipeline -Generators More Components
  • 16. Model Layer
  • 17. Active Record -Represent models and their data -Represent associations between these models -Represent inheritance hierarchies through related models -Validate models before they get persisted to the database -Perform database operations in an object-oriented fashion.
  • 18. Creating Active Record Models
  • 19. Read
  • 20. Update
  • 21. Delete
  • 22. Active Record Migrations app/db/migrations/create_publications.rb
  • 23. Active Record Migrations Supported Methods add_column add_index add_reference add_timestamps create_table create_join_table drop_table drop_join_table remove_timestamps rename_column rename_index remove_reference rename_table
  • 24. Running Migrations
  • 25. Active Record Validations Validations are used to ensure that only valid data is saved into your database.
  • 26. format
  • 27. length
  • 28. numericality
  • 29. presence
  • 30. uniqueness
  • 31. Validation Errors
  • 32. Active Record Callbacks -Active Record provides hooks into this object life cycle so that you can control your application and its data. -Callbacks allow you to trigger logic before or after an alteration of an object's state.
  • 33. Callback Registration
  • 34. When does it get triggered? -Creating an Object before_validation after_validation before_save around_save before_create around_create after_create after_save -Updating an Object before_validation after_validation before_save around_save before_update around_update after_update after_save -Destroying an Object before_destroy around_destroy after_destroy
  • 35. Active Record Associations They make common operations simpler and easier in your code. -Get a user's all posts -Get the author of a post
  • 36. Why Associations? Consider we have Order and Customer models
  • 37. Why Associations? Creating an order
  • 38. Why Associations? Deleting all orders of a customer while deleting a customer
  • 39. IT'S PAINFUL!
  • 40. Use Associations Creating an order Deleting a customer with it's orders
  • 41. belongs_to
  • 42. has_one
  • 43. has_many
  • 44. has_and_belongs_to_many
  • 45. has_many through
  • 46. Polymorphic
  • 47. View Layer -Action View -Layouts & Partials -Rendering
  • 48. Action View -Action View is responsible for compiling the response. -Action View templates are written using embedded Ruby in tags mingled with HTML. -All view files must be in app/views folder
  • 49. app/views/posts/index.html.erb app/views/posts/new.html.erb app/views/posts/edit.html.erb app/views/posts/show.html.erb
  • 50. Templates ERB: Embedded RuBy list_people.html.erb
  • 51. Partials To simplify templates
  • 52. Controller Layer -Controller Overview -Routing
  • 53. Controller Layer -Controller is responsible for making sense of the request and producing the appropriate output -Rails favors pluralization of the last word in the controller's name ClientsController SiteAdminsController PostsController
  • 54. Routing -The Rails router recognizes URLs and dispatches them to a controller's action. -Generate paths and URLs, avoiding the need to hardcode strings in your views. routes.rb Request index.html.erb
  • 55. Where to start? -http://guides.rubyonrails.org -http://railscasts.com
  • 56. Questions?