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当我启动Rails服务器时出现ExecJS :: RuntimeUnavailable错误

ruby-on-railsexecjs
4
我创建了一个新的Rails应用程序。当我尝试启动服务器时，出现以下错误：
[bathakarai@Project1-CO samp]$ rails server
/home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/railties-3.2.13/lib/rails/script_rails_loader.rb:11: warning: Insecure world writable dir /usr in PATH, mode 040777
/home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/bundler-1.3.4/lib/bundler/runtime.rb:216: warning: Insecure world writable dir /usr in PATH, mode 040777
/home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/execjs-1.4.0/lib/execjs/runtimes.rb:51:in `autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/execjs-1.4.0/lib/execjs.rb:5:in `<module:ExecJS>'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/execjs-1.4.0/lib/execjs.rb:4:in `<top (required)>'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `require'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `<top (required)>'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `require'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `<top (required)>'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/coffee-rails-3.2.2/lib/coffee-rails.rb:1:in `require'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/coffee-rails-3.2.2/lib/coffee-rails.rb:1:in `<top (required)>'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/bundler-1.3.4/lib/bundler/runtime.rb:72:in `require'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/bundler-1.3.4/lib/bundler/runtime.rb:72:in `block (2 levels) in require'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/bundler-1.3.4/lib/bundler/runtime.rb:70:in `each'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/bundler-1.3.4/lib/bundler/runtime.rb:70:in `block in require'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/bundler-1.3.4/lib/bundler/runtime.rb:59:in `each'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/bundler-1.3.4/lib/bundler/runtime.rb:59:in `require'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/bundler-1.3.4/lib/bundler.rb:132:in `require'
    from /home/bathakarai/gold/Ruby/Practice/Rails/samp/config/application.rb:7:in `<top (required)>'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/railties-3.2.13/lib/rails/commands.rb:53:in `require'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/railties-3.2.13/lib/rails/commands.rb:53:in `block in <top (required)>'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
    from /home/bathakarai/.rvm/gems/ruby-2.0.0-p0/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>'

我该如何修复这个错误？
3个回答
9

如果您刚生成了一个新的应用程序，当gem therubyracer被注释时，这可能会出现问题。它需要编译您的资产。您可以取消注释，或安装像nodejs这样的东西，这样您就不需要在所有项目中使用gem。

brew install nodejs
# or
sudo apt-get install nodejs
安装Node.js时，这两个命令都无法正常工作。@jvnill - Bathakarai
你可能在使用Windows操作系统吗？ - jvnill
3

尝试

sudo gem install therubyracer

或者

gem install therubyracer

希望这可以帮助到您。
1
安装therubyracer gem后，运行bundle或bundle install命令。一旦成功安装，将"gem 'therubyracer'"行添加到位于项目内的Gemfile中。 - Bathakarai
好的，但是如果我不使用CoffeeScript并且不想要execjs呢？Sprockets依赖于execjs，但是Rails 4需要Sprockets吗？我可以直接放弃execjs吗？ - Ziggy
很棒的解决方案@Bathakarai！这里有一个片段可以快速解决它 :-) - Lucio
1
最受欢迎的JavaScript运行时是一个名为therubyracer的宝石(gem)。正如@muttonlamb所said，安装它只需运行以下命令：
gem install therubyracer

然后，就像 Bathakarai 提到的那样，在文件底部将下一行添加到您的Gemfile中：

gem 'therubyracer'

现在再次运行rails server，一切都应该正常工作。
为了简化流程，您可以运行一个脚本来生成应用程序并自动添加JS运行时。
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