尝试加载gem＆＃39; uglifier＆＃39;时出错。 （捆扎机:: GemRequireError）

Question

为什么我会收到此错误？

shibly@mybox:~/blog$ rails server
/home/shibly/.gem/ruby/2.2.4/gems/bundler-1.11.2/lib/bundler/runtime.rb:80:in `rescue in block (2 levels) in require': There was an error while trying to load the gem 'uglifier'. (Bundler::GemRequireError)
    from /home/shibly/.gem/ruby/2.2.4/gems/bundler-1.11.2/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
    from /home/shibly/.gem/ruby/2.2.4/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in `each'
    from /home/shibly/.gem/ruby/2.2.4/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in `block in require'
    from /home/shibly/.gem/ruby/2.2.4/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in `each'
    from /home/shibly/.gem/ruby/2.2.4/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in `require'
    from /home/shibly/.gem/ruby/2.2.4/gems/bundler-1.11.2/lib/bundler.rb:99:in `require'
    from /home/shibly/blog/config/application.rb:7:in `<top (required)>'
    from /home/shibly/.gem/ruby/2.2.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:78:in `require'
    from /home/shibly/.gem/ruby/2.2.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:78:in `block in server'
    from /home/shibly/.gem/ruby/2.2.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:75:in `tap'
    from /home/shibly/.gem/ruby/2.2.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:75:in `server'
    from /home/shibly/.gem/ruby/2.2.4/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /home/shibly/.gem/ruby/2.2.4/gems/railties-4.2.5/lib/rails/commands.rb:17:in `<top (required)>'
    from bin/rails:9:in `require'
    from bin/rails:9:in `<main>

Answer 1

您应该运行以下命令在Ubuntu中安装NodeJS

sudo apt-get install nodejs

或为OSX运行

brew install nodejs

Uglifier是一个JS包装器，需要运行JS运行时或JS解释器。我会选择安装NodeJS。

Answer 2

在默认的Rails Gemfile中，gem'therubyracer'的行被注释掉了。如果你取消注释它，你将得到那个宝石，它应该工作。

来自“Getting Started with Rails”：

  

编译CoffeeScript和JavaScript资产压缩需要您的系统上有可用的JavaScript运行时，如果没有运行时，您将在资产编译期间看到<ClientConfiguration xmlns="urn:orleans"> <SystemStore SystemStoreType ="SqlServer" DeploymentId="YYY" DataConnectionString="Server=THESERVER;Database=Orleans;User ID=USER;password=PASSWORD;" /> <GatewayProvider ProviderType="SqlServer"/> </ClientConfiguration> 错误。通常，Mac OS X和Windows都安装了JavaScript运行时。 Rails将execjs gem添加到新应用的注释行中生成的therubyracer，如果需要，可以取消注释。 Gemfile是JRuby用户的推荐运行时，默认情况下会添加到JRuby下生成的应用程序中的therubyrhino。您可以在ExecJS调查所有支持的运行时。

Answer 3

创建数据库时出错。

问题是Node.js试图在脚本中没有sudo安装：

sudo apt-get install nodejs