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。我正在遵循一个教程，该教程提到使用rails server命令启动服务器。

运行此命令，我得到以下输出：

$ 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>'

我遇到了几个不同的问题，我已经完成了rvm implode并重新安装了几次。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.我们将不胜感激任何帮助/建议。

由于

Answer 1

试试这个，它对我有用

在“Gemfile”中添加以下行（放置在为Rails项目创建的目录中）

gem'therubyracer'

gem'execjs'

并在终端中运行此命令

捆绑安装

多数民众赞成...... !! ：）

Answer 2

你有JS运行时吗？我认为从Rails 3.1开始需要它（对于资产管道）。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

无法运行rails服务器

2 个答案: