由于 ruby 2.0 和 rails 3.2 的 Authlogic，Rails 服务器和控制台无法启动答案

【问题标题】：Rails server and console fails to start due to Authlogic for ruby 2.0 and rails 3.2由于 ruby 2.0 和 rails 3.2 的 Authlogic，Rails 服务器和控制台无法启动
【发布时间】：2014-04-06 12:41:32
【问题描述】：

我有 ruby 版本 2.0.0p451 和 rails 版本 3.2.13。我运行了 bundle install 并安装了所有的 gem。当我尝试 rails s 命令时，出现以下错误：

问题似乎与 authlogic 有关。我卸载了它，服务器启动正常。有什么想法吗？

   /usr/local/lib/ruby/gems/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- scrypt (LoadError)
        from /usr/local/lib/ruby/gems/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require'
        from /usr/local/lib/ruby/gems/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
        from /usr/local/lib/ruby/gems/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
        from /usr/local/lib/ruby/gems/2.0.0/bundler/gems/authlogic-f19ff3a9eb88/lib/authlogic/crypto_providers/scrypt.rb:1:in `<top (required)>'
        from /usr/local/lib/ruby/gems/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
        from /usr/local/lib/ruby/gems/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require'
        from /usr/local/lib/ruby/gems/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
        from /usr/local/lib/ruby/gems/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
        from /usr/local/lib/ruby/gems/2.0.0/bundler/gems/authlogic-f19ff3a9eb88/lib/authlogic.rb:60:in `block in <top (required)>'
        from /usr/local/lib/ruby/gems/2.0.0/bundler/gems/authlogic-f19ff3a9eb88/lib/authlogic.rb:59:in `each'
        from /usr/local/lib/ruby/gems/2.0.0/bundler/gems/authlogic-f19ff3a9eb88/lib/authlogic.rb:59:in `<top (required)>'
        from /usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.6.1/lib/bundler/runtime.rb:76:in `require'
        from /usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.6.1/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
        from /usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.6.1/lib/bundler/runtime.rb:72:in `each'
        from /usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.6.1/lib/bundler/runtime.rb:72:in `block in require'
        from /usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.6.1/lib/bundler/runtime.rb:61:in `each'
        from /usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.6.1/lib/bundler/runtime.rb:61:in `require'
        from /usr/local/lib/ruby/gems/2.0.0/gems/bundler-1.6.1/lib/bundler.rb:132:in `require'
        from /home/superq/quizot/config/application.rb:7:in `<top (required)>'
        from /usr/local/lib/ruby/gems/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:53:in `require'
        from /usr/local/lib/ruby/gems/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:53:in `block in <top (required)>'
        from /usr/local/lib/ruby/gems/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
        from /usr/local/lib/ruby/gems/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
        from script/rails:6:in `require'
        from script/rails:6:in `<main>'

当我尝试打开控制台时，这是我得到的：

/usr/local/lib/ruby/2.0.0/irb/completion.rb:9:in `require': cannot load such file -- readline (LoadError)
    from /usr/local/lib/ruby/2.0.0/irb/completion.rb:9:in `<top (required)>'
    from /usr/local/lib/ruby/gems/2.0.0/gems/railties-3.2.13/lib/rails/commands/console.rb:3:in `require'
    from /usr/local/lib/ruby/gems/2.0.0/gems/railties-3.2.13/lib/rails/commands/console.rb:3:in `<top (required)>'
    from /usr/local/lib/ruby/gems/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:38:in `require'
    from /usr/local/lib/ruby/gems/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:38:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

我已经卸载了 ruby、rails 并安装了几次。似乎没有任何工作。有什么想法吗？

我只有一个 rails 应用程序，并且永远不会在这台机器上需要另一个 rails 应用程序。安装的所有 gem 仅适用于该应用程序。它工作正常，但我的硬盘崩溃了，现在我正在尝试在新硬盘上设置相同的应用程序。

【问题讨论】：

养成为每个项目创建 gemset 的习惯，然后您需要为该应用程序设置该 gemset，只需键入 gem install rails -v "version" 安装 rails 然后运行 bundle。
我确实有一个 gemfile，我使用捆绑安装。在这里分享有用吗？
你安装了 ruby、rails 吗？
是的，当然。我安装了 ruby 和 rails。添加了 gemfile。
在 application.rb 文件中添加这一行 Bundler.require(:default, Rails.env)

标签： ruby-on-rails ruby webrick

【解决方案1】：

更新到 authlogic-3.4.1 时 scrypt 和 bcrypt 出现同样的错误

我的解决方案是将 scrypt gem 添加到我的 gemfile 中：

gem 'authlogic', '~> 3.4.1'
gem 'bcrypt', '~> 3.1.7'
gem 'scrypt', '1.2.1'

【讨论】：

【解决方案2】：

您的 ruby 安装很可能未针对 readline 开发标头进行编译。尝试将此添加到您的Gemfile：

gem 'rb-readline'

这会将 readline 的纯 ruby 实现添加到您的应用程序中，而不是期望编译的版本。

【讨论】：

【解决方案3】：

您应该使用以下命令安装 ruby readline：

gem install rb-readline

【讨论】：