无法运行rails服务器

Question

我开始学习Ruby on Rails，但现在已经停留在基本安装部分2天了。我正在学习一个教程，其中提到用rails server命令启动服务器。

运行此命令时，我得到下面的输出：

$ rails server 
/home/niranjan/.rvm/gems/ruby-1.9.3-p194/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/niranjan/.rvm/gems/ruby-1.9.3-p194/gems/execjs-1.4.0/lib/execjs.rb:5:in `<module:ExecJS>' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194/gems/execjs-1.4.0/lib/execjs.rb:4:in `<top (required)>' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `require' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `<top (required)>' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `require' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `<top (required)>' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194/gems/coffee-rails-3.2.2/lib/coffee-rails.rb:1:in `require' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194/gems/coffee-rails-3.2.2/lib/coffee-rails.rb:1:in `<top (required)>' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.5/lib/bundler/runtime.rb:68:in `require' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.5/lib/bundler/runtime.rb:68:in `block (2 levels) in require' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.5/lib/bundler/runtime.rb:66:in `each' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.5/lib/bundler/runtime.rb:66:in `block in require' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.5/lib/bundler/runtime.rb:55:in `each' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.5/lib/bundler/runtime.rb:55:in `require' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194@global/gems/bundler-1.1.5/lib/bundler.rb:119:in `require' 
    from /home/niranjan/fourth_app/config/application.rb:7:in `<top (required)>' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/commands.rb:53:in `require' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/commands.rb:53:in `block in <top (required)>' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/commands.rb:50:in `tap' 
    from /home/niranjan/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/commands.rb:50:in `<top (required)>' 
    from script/rails:6:in `require' 
    from script/rails:6:in `<main>' 

我一直有几个不同的问题，我已经做了rvm implode，并重新安装了好几次。我在PATH变量中有rvm脚本。

$ rvm -v 

rvm 1.15.7 (stable) by Wayne E. Seguin <wayneeseguin@gmail.com>, Michal Papis <mpapis@gmail.com> [https://rvm.io/] 

$ ruby -v 
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux] 


$ rails -v 
Rails 3.2.8 

我正在使用Linux Mint 12.任何帮助/建议，将不胜感激。

谢谢

Answer 1

试试这个，它为我工作

添加以下你“的Gemfile”线（用于放置在Rails项目创建的目录）

宝石 'therubyracer'

宝石 'execjs'

，并在终端运行此命令

捆绑安装

完蛋了.. !! :)

Answer 2

你有JS运行时吗？我认为这是从Rails 3.1开始（对于资产管道）所必需的。看看这篇文章：Deploying a Rails 3.1 App Gotchas。

尝试installing node.js。

它也可能与此有关：ExecJS and could not find a JavaScript runtime