Rails服务器无法启动 - >无法找到JavaScript运行时

Question

我在文件夹'issues'中创建了一个新的rails应用程序,当我想'ruby s'时,我收到了一个错误.任何帮助都感激不尽

[thiago@netbox issues]$ rails s
/home/thiago/.rvm/gems/ruby-1.9.3-p429/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/thiago/.rvm/gems/ruby-1.9.3-p429/gems/execjs-1.4.0/lib/execjs.rb:5:in `<module:ExecJS>'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/execjs-1.4.0/lib/execjs.rb:4:in `<top (required)>'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `require'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `<top (required)>'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `require'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `<top (required)>'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/coffee-rails-3.2.2/lib/coffee-rails.rb:1:in `require'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/coffee-rails-3.2.2/lib/coffee-rails.rb:1:in `<top (required)>'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `block (2 levels) in require'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `each'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `block in require'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `each'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429@global/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `require'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429@global/gems/bundler-1.3.5/lib/bundler.rb:132:in `require'
    from /home/thiago/Documents/wdi/rails_practice/issues/config/application.rb:7:in `<top (required)>'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/commands.rb:53:in `require'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/commands.rb:53:in `block in <top (required)>'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
    from /home/thiago/.rvm/gems/ruby-1.9.3-p429/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>'

我在我的Gemfile中添加了"therubyracer"gem,然后'$ bundle install'工作!

Gemfile
source 'https://rubygems.org'

gem 'rails', '3.2.8'
gem 'sqlite3'

group :assets do
gem 'sass-rails',   '~> 3.2.3'
gem 'coffee-rails', '~> 3.2.1'
gem 'uglifier', '>= 1.0.3'
end

gem 'jquery-rails'
gem 'therubyracer' # added

Answer 1

我在1月份开始研究Rails时,对于Windows和Ubuntu都有同样的错误.错误非常简单.您需要一个JavaScript运行时环境来启动服务器.

有很多解决方案.我在Ubuntu上使用的是安装NodeJS.

在Ubuntu上,您将运行以下内容来安装NodeJS:

sudo add-apt-repository ppa:chris-lea/node.js
sudo apt-get -y update
sudo apt-get -y install nodejs

这些是我用来执行它的命令,因为它将安装最新的稳定版本的NodeJS,但你可以运行sudo apt-get -y install nodejs并且没问题.

在Windows上,我使用的答案,可能还有其他答案,就是编辑你的Gemfile来安装therubyracer.我现在正在处理Rails 4.0 RC1应用程序,它们都gem 'therubyracer', platform: :ruby已经在Gemfile中注释掉了.

gem 'therubyracer'如果你在Windows上运行,那么你可以在你的Gemfile中添加它,这会让你运行我敢打赌.然后跑bundle install.

Answer 2

找不到JavaScript运行时.我想你的Gemfile中没有一个.尝试编辑Gemfile并添加

gem 'therubyracer'

然后运行

$ bundle install