Railties

Railties is responsible for gluing all frameworks together. Handles bootstrapping of application and provides rails command line interface.

• provides several hooks to extend Rails, or modify initialization process
• every major component of rails (action mailer, action controller, active record) implements a railtie
  • each responsible for their own initialization, so rails is absent of any component hooks
• railties are only needed if an extension interacts with Rails during or after boot
  • creating initializers
  • configuring rails, generators, adding a config key
  • adding a rake task

Design

Railties is abstract, cannot be instantiated and is meant to be inherited.

• defines a base api for other classes to use
• has four main methods, rake_tasks, console, runner and generators
• railties provides a way to configure anything which subclasses Rails::Railtie

Class Based Design

Command Line Basics

rails console, rails server, rails generate, rails new

rails dbconsole opens the respective database console

rails runner "Model.method runs ruby code in the context of Rails.