How to install the bootstrap-sass gem

How to install the bootstrap-sass gem

• Add bootstrap-sass gem to the Gemfile:
  gem 'bootstrap-sass', '~> 3.3', '>= 3.3.6'
  or install it from your terminal: gem install bootstrap-sass -v 3.3.6
• Restart the server (ctrl+c, rails s) to make the files available through the pipeline
• Rename file extension app/assets/stylesheets/application.css to .scss
• In the bottom of this file (don’t touch anything else), add:

// "bootstrap-sprockets" must be imported before "bootstrap" and "bootstrap/variables"
@import "bootstrap-sprockets";
@import "bootstrap";

• In the file app/assets/javascripts/application.js add:

//= require jquery
//= require bootstrap-sprockets

• Refresh your project page in the browser (localhost:3000) — it will look boostrap-styled after that
• If you have the file app/assets/stylesheets/scaffolds.scss, you can delete everything inside it since it will be overridden by bootstrap anyway

Useful links:
bootstrap-sass on Rubygems
bootstrap-sass documentation
SO: difference between bootstrap-sass and twitter-bootstrap-rails gems

bootstrap-sass vs twitter-bootstrap-rails

twitter-bootstrap-rails this gem offers not only bootstrap itself, but also some handy helpers and a layout generator
bootstrap-sass — official bootstrap gem