how to implement bootstrap 4 and rails 5

Question

I am new to ruby and I am trying to include bootstrap 4.0.0.alpha4 into rails 5.0.0. I have installed the gems bootstrap,bootstrap-sass, autoprefixer-rails and I have even used @import "bootstrap" in the application.css.sass, but still I am not getting the bootstrap on the page.I have a button on the view where I am trying to implement the bootstrap design. I have even tried it on different projects ut none of them works. Any help would be appreciated. Thanks.
The codes are as shown below. Gem file

    source 'https://rubygems.org'


# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.0.0'
# Use postgresql as the database for Active Record
gem 'pg', '~> 0.18'
# Use Puma as the app server
gem 'puma', '~> 3.0'

gem 'bootstrap'
gem 'bootstrap-sass'
gem 'autoprefixer-rails'

gem 'wdm'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 3.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platform: :mri
end

group :development do
  # Access an IRB console on exception pages or by using <%= console %> anywhere in the code.
  gem 'web-console'
  gem 'listen', '~> 3.0.5'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

Answer 1

For official reference code for including Bootstrap into Rails, see the test/dummy_rails project skeleton in the official bootstrap-rubygem project. This project is used in integration-tests so you know it will work with the latest version of the Bootstrap gem and any version of Ruby/Rails in the project's test matrix.

Make sure these lines of code (or equivalent) have been added to your Rails project:

• //= require bootstrap-sprockets in app/assets/javascripts/application.js
• @import bootstrap in app/assets/stylesheets/application.sass
• config.assets.precompile += %w( application.css application.js ) in config/application.rb
• run rake assets:precompile

If you continue to have issues, post full source code to your Rails app or enough to serve as a Minimal, Complete and Verifiable Example that produces your issue- there's always a possibility that something you've changed locally that you haven't thought about but is actually important.

Answer 2

Great link and here is my config:

Gemfile:

gem 'compass-rails', '2.0.4'
gem 'bootstrap-sass', '~> 3.1.1.1'
gem 'autoprefixer-rails', '6.3.7'
gem 'sass-rails', '~> 5.0.1'

config/initializers/assets.rb

Rails.application.config.assets.version = '1.0'
Rails.application.config.assets.paths << Rails.root.join('app', 'assets', 'fonts')

And on my sass files tree:

app/assets/stylesheets
|
|--components
|    |
|    |--variables, 
|    |--mixins and another css/sass files
|
|--bootstrap.sass
|--application.sass

application.sass:

@import 'bootstrap'
@import 'components/*'

bootstrap.sass:

// Core variables and mixins
@import 'bootstrap/variables'
@import 'bootstrap/mixins'

// Reset
@import 'bootstrap/normalize'
//@import 'bootstrap/print'

// Core CSS
//@import 'bootstrap/scaffolding'

header:

= stylesheet_link_tag 'application', media: 'all'