首先 rails 安装：Rake 中止没有 javascript 运行时

Question

我正在观看安装 rails 的视频教程，在安装 rails、gems 和 mysql 之后，该视频介绍了 rake db:create 作为确保 mysql 正常工作的测试。

c:\row\dev\Hello_World>rake db:create
DL is deprecated, please use Fiddle
rake aborted!
Bundler::GemRequireError: There was an error while trying to load the gem 'uglifier'.
c:/row/dev/Hello_World/config/application.rb:7:in `<top (required)>'
c:/row/dev/Hello_World/Rakefile:4:in `<top (required)>'
ExecJS::RuntimeUnavailable: Could not find a JavaScript runtime. See https://github.com/rails/execjs for a list of available runtimes.
c:/row/dev/Hello_World/config/application.rb:7:in `<top (required)>'
c:/row/dev/Hello_World/Rakefile:4:in `<top (required)>'
(See full trace by running task with --trace)

我有点迷路了。任何帮助，将不胜感激。

因为它在评论中出现了几次，gem install therubyracer 给出了这个：

ERROR:  Error installing therubyracer:
        ERROR: Failed to build gem native extension.

    c:/row/Ruby21/bin/ruby.exe extconf.rb
creating Makefile
which: no python in (.;c:\row\Ruby21\devkit\bin;c:\row\Ruby21\devkit\mingw\bin;c:\windows;C:\Program Files\MySQL\MySQL Server 5.7\bin;c:\row\Ruby21\bin)
The system cannot find the path specified.
which: no python in (.;c:\row\Ruby21\devkit\bin;c:\row\Ruby21\devkit\mingw\bin;c:\windows;C:\Program Files\MySQL\MySQL Server 5.7\bin;c:\row\Ruby21\bin)
c:/row/Ruby21/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.13/ext/libv8/builder.rb:81:in `setup_python!': libv8 requires python 2 to be installed in order to build, but it is currently not available (RuntimeError)
        from c:/row/Ruby21/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.13/ext/libv8/builder.rb:55:in `block in build_libv8!'
        from c:/row/Ruby21/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.13/ext/libv8/builder.rb:52:in `chdir'
        from c:/row/Ruby21/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.13/ext/libv8/builder.rb:52:in `build_libv8!'
        from c:/row/Ruby21/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.13/ext/libv8/location.rb:24:in `install!'
        from extconf.rb:7:in `<main>'

extconf failed, exit code 1

Gem files will remain installed in c:/row/Ruby21/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.13 for inspection.
Results logged to c:/row/Ruby21/lib/ruby/gems/2.1.0/extensions/x86-mingw32/2.1.0/libv8-3.16.14.13/gem_make.out

Answer 1

尝试安装therubyracergem

Answer 2

尝试修复它：

/usr/local/lib/ruby/gems/ruby_ver/gems/execjs-ver/lib/execjs/runtimes.rb

Node = ExternalRuntime.new(
      :name        => "Node.js (V8)",
      :command     => ["nodejs", "/usr/local/bin/node"],
      :runner_path => ExecJS.root + "/support/node_runner.js",
      :encoding    => 'UTF-8'
    )

Answer 3

根据情况，您可以将 node.js 安装到系统中。

在我的 AmazonWS AMI EC2 中修复它。

Answer 4

将其粘贴到终端

gem install therubyracer

插入您的 Gemfile

  gem 'uglifier', '~> 2.7', '>= 2.7.2'

运行

bundle install

首先 rails 安装：Rake 中止没有 javascript 运行时

First rails install: Rake aborted no javascript runtime

javascript

ruby

rake

ruby-on-rails