在gemfile中使用bcrypt不允许我重新启动rails服务器并删除它导致浏览器出现问题（要求我将其添加回来）

Question

I have seen similar query being asked about issues with bcrypt but none of them discuss about this particular issue that I am facing currently. The solutions are either restarting rails server or installing bcrypt gem both of which are not helping me. I am using Windows 7

Here are the problems I am facing,
1. If I have bcrypt 3.1.7 in my Gemfile, I am not able to start the rails server. The command 'rails server' gives me below error

C:\row\RailsInstaller\workspace\app2>rails s
C:/row/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bcrypt-3.1.7-x86-mingw3
    2/lib/bcrypt.rb:16:in `require': cannot load such file -- bcrypt_ext (LoadError)
    from C:/row/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bcrypt-3.1
    .7-x86-mingw32/lib/bcrypt.rb:16:in `rescue in <top (required)>'
    from C:/row/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bcrypt-3.1
    .7-x86-mingw32/lib/bcrypt.rb:12:in `<top (required)>'
    from C:/row/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.
    8.3/lib/bundler/runtime.rb:76:in `require'
    from C:/row/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.
    8.3/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
    from C:/row/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.

2. If I remove the bcrypt 3.1.7 in my Gemfile, then I am able to start the server but in browser I am seeing this error

LoadError in UsersController#show
cannot load such file -- bcrypt

Gemfile

source 'https://rubygems.org'

gem 'rails', '4.2.0'
gem 'bootstrap-sass',   '3.2.0.0'
gem 'bcrypt',   '3.1.7'
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 'sdoc', '~> 0.4.0', group: :doc

group :development, :test do
    gem 'sqlite3'
    gem 'byebug'
    gem 'web-console', '~> 2.0'
    gem 'spring',      '1.1.3'
end

gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

group :test do
  gem 'minitest-reporters', '1.0.5'
  gem 'mini_backtrace',     '0.1.3'
  gem 'guard-minitest',     '2.3.1'
end

group :production do
  gem 'pg',             '0.17.1'
  gem 'rails_12factor', '0.0.2'
end

Gemfile.lock

GEM
  remote: https://rubygems.org/
  specs:
    actionmailer (4.2.0)
      actionpack (= 4.2.0)
      actionview (= 4.2.0)
      activejob (= 4.2.0)
      mail (~> 2.5, >= 2.5.4)
      rails-dom-testing (~> 1.0, >= 1.0.5)
    actionpack (4.2.0)
      actionview (= 4.2.0)
      activesupport (= 4.2.0)
      rack (~> 1.6.0)
      rack-test (~> 0.6.2)
      rails-dom-testing (~> 1.0, >= 1.0.5)
      rails-html-sanitizer (~> 1.0, >= 1.0.1)
    actionview (4.2.0)
      activesupport (= 4.2.0)
      builder (~> 3.1)
      erubis (~> 2.7.0)
      rails-dom-testing (~> 1.0, >= 1.0.5)
      rails-html-sanitizer (~> 1.0, >= 1.0.1)
    activejob (4.2.0)
      activesupport (= 4.2.0)
      globalid (>= 0.3.0)
    activemodel (4.2.0)
      activesupport (= 4.2.0)
      builder (~> 3.1)
    activerecord (4.2.0)
      activemodel (= 4.2.0)
      activesupport (= 4.2.0)
      arel (~> 6.0)
    activesupport (4.2.0)
      i18n (~> 0.7)
      json (~> 1.7, >= 1.7.7)
      minitest (~> 5.1)
      thread_safe (~> 0.3, >= 0.3.4)
      tzinfo (~> 1.1)
    ansi (1.5.0)
    arel (6.0.0)
    bcrypt (3.1.7-x86-mingw32)
    binding_of_caller (0.7.2)
      debug_inspector (>= 0.0.1)
    bootstrap-sass (3.2.0.0)
      sass (~> 3.2)
    builder (3.2.2)
    byebug (3.5.1)
      columnize (~> 0.8)
      debugger-linecache (~> 1.2)
      slop (~> 3.6)
    celluloid (0.16.0)
      timers (~> 4.0.0)
    coderay (1.1.0)
    coffee-rails (4.1.0)
      coffee-script (>= 2.2.0)
      railties (>= 4.0.0, < 5.0)
    coffee-script (2.3.0)
      coffee-script-source
      execjs
    coffee-script-source (1.9.1)
    columnize (0.9.0)
    debug_inspector (0.0.2)
    debugger-linecache (1.2.0)
    erubis (2.7.0)
    execjs (2.3.0)
    ffi (1.9.6-x86-mingw32)
    formatador (0.2.5)
    globalid (0.3.3)
      activesupport (>= 4.1.0)
    guard (2.12.4)
      formatador (>= 0.2.4)
      listen (~> 2.7)
      lumberjack (~> 1.0)
      nenv (~> 0.1)
      notiffany (~> 0.0)
      pry (>= 0.9.12)
      shellany (~> 0.0)
      thor (>= 0.18.1)
    guard-minitest (2.3.1)
      guard (~> 2.0)
      minitest (>= 3.0)
    hike (1.2.3)
    hitimes (1.2.2-x86-mingw32)
    i18n (0.7.0)
    jbuilder (2.2.8)
      activesupport (>= 3.0.0, < 5)
      multi_json (~> 1.2)
    jquery-rails (4.0.3)
      rails-dom-testing (~> 1.0)
      railties (>= 4.2.0)
      thor (>= 0.14, < 2.0)
    json (1.8.2)
    listen (2.8.5)
      celluloid (>= 0.15.2)
      rb-fsevent (>= 0.9.3)
      rb-inotify (>= 0.9)
    loofah (2.0.1)
      nokogiri (>= 1.5.9)
    lumberjack (1.0.9)
    mail (2.6.3)
      mime-types (>= 1.16, < 3)
    method_source (0.8.2)
    mime-types (2.4.3)
    mini_backtrace (0.1.3)
      minitest (> 1.2.0)
      rails (>= 2.3.3)
    mini_portile (0.6.2)
    minitest (5.5.1)
    minitest-reporters (1.0.5)
      ansi
      builder
      minitest (>= 5.0)
      ruby-progressbar
    multi_json (1.10.1)
    nenv (0.2.0)
    nokogiri (1.6.6.2-x86-mingw32)
      mini_portile (~> 0.6.0)
    notiffany (0.0.6)
      nenv (~> 0.1)
      shellany (~> 0.0)
    pg (0.17.1-x86-mingw32)
    pry (0.10.1-x86-mingw32)
      coderay (~> 1.1.0)
      method_source (~> 0.8.1)
      slop (~> 3.4)
      win32console (~> 1.3)
    rack (1.6.0)
    rack-test (0.6.3)
      rack (>= 1.0)
    rails (4.2.0)
      actionmailer (= 4.2.0)
      actionpack (= 4.2.0)
      actionview (= 4.2.0)
      activejob (= 4.2.0)
      activemodel (= 4.2.0)
      activerecord (= 4.2.0)
      activesupport (= 4.2.0)
      bundler (>= 1.3.0, < 2.0)
      railties (= 4.2.0)
      sprockets-rails
    rails-deprecated_sanitizer (1.0.3)
      activesupport (>= 4.2.0.alpha)
    rails-dom-testing (1.0.5)
      activesupport (>= 4.2.0.beta, < 5.0)
      nokogiri (~> 1.6.0)
      rails-deprecated_sanitizer (>= 1.0.1)
    rails-html-sanitizer (1.0.1)
      loofah (~> 2.0)
    rails_12factor (0.0.2)
      rails_serve_static_assets
      rails_stdout_logging
    rails_serve_static_assets (0.0.4)
    rails_stdout_logging (0.0.3)
    railties (4.2.0)
      actionpack (= 4.2.0)
      activesupport (= 4.2.0)
      rake (>= 0.8.7)
      thor (>= 0.18.1, < 2.0)
    rake (10.4.2)
    rb-fsevent (0.9.4)
    rb-inotify (0.9.5)
      ffi (>= 0.5.0)
    rdoc (4.2.0)
      json (~> 1.4)
    ruby-progressbar (1.7.1)
    sass (3.4.13)
    sass-rails (5.0.1)
      railties (>= 4.0.0, < 5.0)
      sass (~> 3.1)
      sprockets (>= 2.8, < 4.0)
      sprockets-rails (>= 2.0, < 4.0)
      tilt (~> 1.1)
    sdoc (0.4.1)
      json (~> 1.7, >= 1.7.7)
      rdoc (~> 4.0)
    shellany (0.0.1)
    slop (3.6.0)
    spring (1.1.3)
    sprockets (2.12.3)
      hike (~> 1.2)
      multi_json (~> 1.0)
      rack (~> 1.0)
      tilt (~> 1.1, != 1.3.0)
    sprockets-rails (2.2.4)
      actionpack (>= 3.0)
      activesupport (>= 3.0)
      sprockets (>= 2.8, < 4.0)
    sqlite3 (1.3.10-x86-mingw32)
    thor (0.19.1)
    thread_safe (0.3.4)
    tilt (1.4.1)
    timers (4.0.1)
      hitimes
    turbolinks (2.5.3)
      coffee-rails
    tzinfo (1.2.2)
      thread_safe (~> 0.1)
    tzinfo-data (1.2015.1)
      tzinfo (>= 1.0.0)
    uglifier (2.7.1)
      execjs (>= 0.3.0)
      json (>= 1.8.0)
    web-console (2.0.0)
      activemodel (~> 4.0)
      binding_of_caller (>= 0.7.2)
      railties (~> 4.0)
      sprockets-rails (>= 2.0, < 4.0)
    win32console (1.3.2-x86-mingw32)

PLATFORMS
  x86-mingw32

DEPENDENCIES
  bcrypt (= 3.1.7)
  bootstrap-sass (= 3.2.0.0)
  byebug
  coffee-rails (~> 4.1.0)
  guard-minitest (= 2.3.1)
  jbuilder (~> 2.0)
  jquery-rails
  mini_backtrace (= 0.1.3)
  minitest-reporters (= 1.0.5)
  pg (= 0.17.1)
  rails (= 4.2.0)
  rails_12factor (= 0.0.2)
  sass-rails (~> 5.0)
  sdoc (~> 0.4.0)
  spring (= 1.1.3)
  sqlite3
  turbolinks
  tzinfo-data
  uglifier (>= 1.3.0)
  web-console (~> 2.0)

I am not sure what to do now. Can someone help?

Answer 1

Step 1. Update your system's bcrypt to be current; this is independent of Rails.

$ gem install bcrypt -v '3.1.10'

Step 2. Verify bcrypt works by using IRB; this is independent of Rails.

$ irb
> gem 'bcrypt', '3.1.10'
=> true

Step 3. If Step 1 and 2 succeed, then update your Rails Gemfile:

gem bcrypt, '3.1.10'

Step 4. Bundle your gems so your Rails app gets its own copies of gems:

$ bundle install 

Step 5. Start your server by using bundle:

$ bundle exec rails server

Do these steps succeed for you? If so, great.

If not, then can you please edit your question to show exactly which step didn't work, and copy/paste the exact error message?