rails generate model：錯誤

Question

我是鐵桿上的紅寶石新手。 我終於在ubuntu 11上成功安裝了rails並創建了一個帶有“rails new myapp”的應用程序。

但是在生成模型時，“bundle exec rails生成模型注釋用戶：string user_comment：text”我收到以下錯誤：

我對可能出錯的東西一無所知。

/home/pratuat/.rvm/gems/ruby-1.9.2-p290/gems/execjs-1.2.9/lib/execjs/runtimes.rb:47:in `autodetect': Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290/gems/execjs-1.2.9/lib/execjs.rb:5:in `'
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290/gems/execjs-1.2.9/lib/execjs.rb:4:in `'
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `require'
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290/gems/coffee-script-2.2.0/lib/coffee_script.rb:1:in `'
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `require'
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290/gems/coffee-script-2.2.0/lib/coffee-script.rb:1:in `'
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290/gems/coffee-rails-3.1.1/lib/coffee-rails.rb:1:in `require'
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290/gems/coffee-rails-3.1.1/lib/coffee-rails.rb:1:in `'
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:68:in `require'
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:66:in `each'
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:66:in `block in require'
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:55:in `each'
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:55:in `require'
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290@global/gems/bundler-1.0.21/lib/bundler.rb:122:in `require'
    from /home/pratuat/Documents/rails/railsdemo/config/application.rb:7:in `'
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.3/lib/rails/commands.rb:21:in `require'
    from /home/pratuat/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.3/lib/rails/commands.rb:21:in `'
    from script/rails:6:in `require'
    from script/rails:6:in `'

Answer 1

https://github.com/sstephenson/execjs

您需要從運行時列表中進行選擇。 我發現最簡單的是therubyracer。 將其添加到您的Gemfile，然后執行bundle install 。

gem "therubyracer"

之后你的模型生成器應該工作。