Devise::RegistrationsController#create 中的 LoadError（无法加载此类文件 -- bcrypt_ext）。为什么我会收到此错误？

Question

我正在使用 ruby​​ 2.2.4。安装 Devise gem 后尝试注册时出现此错误。我以前使用 ruby​​ 2.1.5 时从未遇到过这个错误。是ruby版本导致这里出错的原因吗？

更新：这是我的 gemfile 的样子，我使用的是 Windows 7 Professional 64 位

source 'https://rubygems.org'


gem 'rails', '4.2.5.1'
gem 'sqlite3'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.1.0'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 2.0'
gem 'simple_form', '~> 3.2', '>= 3.2.1'
gem 'country_select', '~> 2.5', '>= 2.5.1'
gem 'devise', '~> 3.5', '>= 3.5.6'

group :doc do
    gem 'sdoc', '~> 0.4.0'
end


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

group :development do
  # Access an IRB console on exception pages or by using <%= console %> in views
  gem 'web-console', '~> 2.0'
end

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

Answer 1

Devise 3.5.6 需要 bcrypt

这是我在bcrypt github repo上挖到的：

1) Launch a terminal session
2) Enter gem uninstall bcrypt
3) Enter gem uninstall bcrypt-ruby
4) Enter gem install bcrypt --platform=ruby
5) Edit your gemfile to include the following line:
   gem 'bcrypt-ruby', '3.1.5', :require => 'bcrypt'
6) Run bundle install