The document discusses the main frameworks that make up Ruby on Rails - ActionPack, ActiveRecord, ActiveModel, ActionMailer, ActiveResource, ActiveSupport, and Railties. It provides brief descriptions of each framework, including what components they include and their general purpose within Rails. It also discusses how these frameworks have evolved over different versions of Rails and how developers can create their own frameworks by building on Rails::Railtie.

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