试图加载 gem‘ ugfier’时出现错误。(Bundler: : GemRequreError)

为什么我会得到这个错误？

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>
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最佳答案

您应该运行以下命令在 Ubuntu 中安装 NodeJS

sudo apt-get install nodejs

or run this for OSX 

brew install nodejs

Uglifier 是一个 JS 包装器，它需要运行一个 JS 运行时或 JS 解释器。我会选择安装 NodeJS。

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In the default Rails Gemfile, the line for the gem 'therubyracer' is commented out. If you uncomment it, you'll get that gem and it should work.

来自 开始使用 Rails:

编译 CoffeeScript 和 JavaScript 资产压缩需要在您的系统上有一个可用的 JavaScript 运行时，如果没有运行时，您将在资产编译期间看到一个 execjs错误。通常 MacOSX 和 Windows 都安装了 JavaScript 运行时。Rails 将 therubyracer gem 添加到新应用程序的注释行中生成的 Gemfile中，如果需要，可以取消注释。therubyrhino是 JRuby 用户推荐的运行时，在 JRuby 下生成的应用程序中，它默认被添加到 Gemfile中。您可以在 执行上调查所有支持的运行时。

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创建数据库时出错。

The problem is that the Node.js tried to install without sudo in the script:

sudo apt-get install nodejs

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