Rails 4 Course Topics

gistfile1.md

Rails 4 Topics

Chapter 1

• Ruby 1.9.3 and Whiny Nils.
• ThreadSafety enabled in production.
• Changes to match in routes.
• Support for patch HTTP verb.
• Route concerns

Chapter 2

• Deprecation of Hash-based finders, like Post.find(:all)
• Deprecation of dynamic finders that return collection, like Post.find_all_by_title('Rails 4').
• Deprecation of dynamic finders that build or create objects, like Post.find_or_initialize_by_author('admin') and Post.find_or_create_by_author('admin').
• New find_or_initialize_by, find_or_create_by and find_by.
• New AR#update, AR#update_column and AR#update_columns methods.
• ActiveRecord scopes must now take a callable object.
• Deprecation of Model.scoped in favor of Model.all, which now returns a chainable object.
• New Relation#load, Relation#none and Relation#not.
• Changes to Relation#order.
• New references method used when matching on attributes from eager loaded associations, like Post.includes(:comments).where("comments.name = 'foo'").references(:comments), and scenarios where references is not needed.
• New ActiveMode::Model module.

Chapter 3

• New Strong Parameters feature.
• Authenticity token in remote forms now injected via JavaScript.
• Custom handling for request_from_forgery.
• New suffix for controller callbacks, like before_action :authenticate_user.
• Custom Flash Types.
• Encrypted Cookies.

Chapter 4

• collection_check_boxes.
• collection_radio_buttons.
• date_select.
• date_field.
• Ruby template handler, example with returning JSON.

Chapter 5

• New test folder structure.
• New rake tasks for running tests.
• Changes to performance testing.
• Switch from TestUnit to MiniTest.

Chapter 6

• Moved from memcache-client to dalli.
• Controller wide etags.
• New cache digests feature.

Chapter 7

• ActionController::Live
• Turbolinks