How to add Bootstrap in Ruby on Rails App

bootstrap-in-rails

1. Add following gems in Gemfile
     gem 'bootstrap-sass', '~>3.3.6'
     gem 'autoprefixer-rails', '~>7.1.1'
     
2. Run bundle install

3. Add one file custom.css.scss file under app/assets/stylesheets with following contents,
     @import 'bootstrap-sprockets';
     @import 'bootstrap'
     
4. Add bootstrap-sprockets after jquery_ujs in application.js under app/assets/javascripts,
     //= require jquery
     //= require jquery_ujs
     //= require bootstrap-sprockets

Enjoy bootstrap! 

Note: Tested in rails 5 please check gem version before using for Rails 3 and Rails 4.