Rails 3 concepts

1. Rails Concepts
A Shivasubramanian

2. Gemfile & Gemfile.lock
 config.frameworks
 ActionPack
 ActiveRecord
 ActiveModel
 ActionMailer
 ActiveResource
 ActiveSupport
 Railties

3. Rails frameworks
 config.frameworks
 ActionPack
 ActiveRecord
 ActiveModel
 ActionMailer
 ActiveResource
 ActiveSupport
 Railties

4. Rails frameworks
 ActionPack
 Handles web requests & responses
 The C & V part of MVC
 Two modules
 ActionDispatch
 Parses information about & from the
request
 Decides which controller should execute
the request
 ActionController
 ActionController::Base
 Create filters
 Automatically call views for rendering

5. Rails frameworks
 ActiveRecord
 ORM for Rails
 M in MVC
 Create “Models” (ActiveRecord::Base)
 “Callback lifecycle”
 Provides callbacks for various “events”

6. Rails frameworks
 ActiveModel
 Similar to ActiveRecord, but without a backing
table
 Various modules
 Brings various features present in ActiveModel to
plain classes

7. Rails frameworks
 ActionMailer
 Handles email sending & receiving
 ActionMailer::Base
 Enables mail content to be treated similar to
views
 Can trigger other actions based on incoming mail

8. Rails frameworks
 ActiveResource
 ORM mapping for REST endpoints
 Represents REST endpoints as Rails classes
 ActiveResource::Base
 Internally generates a REST XML request &
converts the response into a Ruby object.

9. Rails frameworks
 ActiveSupport
 Utility classes
 Ruby extensions

10. Rails frameworks
 Railties
 Glues all frameworks together
 Handles bootstrapping for a Rails app
 Rails::Railtie
 Provides hooks to modify the initialization
process.

11. Rails frameworks over the years
Rails 3.x
 ActionPack
 ActiveRecord
 ActiveModel
 ActionMailer
 ActiveResource
 ActiveSupport
 Railties
Rails 2.x
 ActionPack
 ActiveRecord
 ActionMailer
 ActionWebService
 ActiveResource
 ActiveSupport
 Railties
Rails 1.x
 ActionPack
 ActiveRecord
 ActionMailer
 ActionWebService
 ActiveSupport
 Railties

12. Can I write my own framework?
 Yes, you can.
 But it must be a Rails::Railtie
 Every component in Rails is a Rails::Railtie

13. Rails Engines
 Shareable Rails applications
 Share them as a library!
 Rails::Engine
 Rails::Engine < Rails::Railtie


14. Gems, plugins, engines
 Railties
 Engines
 Application

15. Middleware
 Railties
 Engines
 Application