Welcome to Rails
The Model layer represents your domain model (such as Account, Product, Person, Post) and encapsulates the business logic that is specific to your application. In Rails, database-backed model classes are derived from ActiveRecord::Base. Active Record allows you to present the data from database rows as objects and embellish these data objects with business logic methods. Although most Rails models are backed by a database, models can also be ordinary Ruby classes, or Ruby classes that implement a set of interfaces as provided by the ActiveModel module. You can read more about Active Record in its README.
In Rails, the Controller and View layers are handled together by Action Pack. These two layers are bundled in a single package due to their heavy interdependence. This is unlike the relationship between Active Record and Action Pack which are independent. Each of these packages can be used independently outside of Rails. You can read more about Action Pack in its README.
Install Rails at the command prompt if you haven't yet:
gem install rails
At the command prompt, create a new Rails application:
rails new myapp
where “myapp” is the application name.
Change directory to myapp and start the web server:
cd myapp; rails server
Run with --help or -h for options.
Go to localhost:3000 and you'll see:
"Welcome aboard: You're riding Ruby on Rails!"
The README file created within your application.
The Ruby on Rails Guides.
The API Documentation.
Ruby on Rails is released under the MIT license: