Twitter bootstrap 带Rails 5的引导程序

我正在尝试将引导添加到我的新Rails 5应用程序中。我一直在跟踪调查，但毫无结果。页面未加载引导样式。知道我做错了什么吗？谢谢

application.scss文件：

@import "bootstrap";

档案：

source 'https://rubygems.org'


# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.0.0'
# Use sqlite3 as the database for Active Record
gem 'pg'
# Use Puma as the app server
gem 'puma', '~> 3.0'
# 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

gem 'haml-rails'
gem 'bootstrap', '~> 4.0.0.alpha3'
gem 'sprockets-rails', :require => 'sprockets/railtie'

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]

index.html.erb文件： 链接

按钮

这是一个愚蠢的错误。我的控制器是：

class HomeController < ActionController::Base
  def index
  end
end

class HomeController

而不是：

class HomeController < ApplicationController
  def index
  end
end

class HomeController

这是一个愚蠢的错误。我的控制器是：

class HomeController < ActionController::Base
  def index
  end
end

class HomeController

而不是：

class HomeController < ApplicationController
  def index
  end
end

class HomeController