rake db:schema:dump 不工作

Posted 2023-02-26

【中文标题】rake db:schema:dump 不工作

【英文标题】：rake db:schema:dump not working

【发布时间】：2016-10-02 19:04:57

【问题描述】：

我正在 windows 8 的 windows 平台上学习 ruby​​ on rails。现在我在数据库部分，rake db:schema:dump 命令应该在配置文件夹中创建一个名为 schema.rb 的文件，但这并没有发生。当我输入rake db:schema:dump 时，它会显示rake aborted 和一长串列表。请帮忙。

以下是控制台中显示的内容：

C:\Users\New User\sites2\learning_rails>rake db:schema;dump
rake aborted!
Bundler::GemRequireError: There was an error while trying to load the gem 'uglif
ier'.
Gem Load Error is: Could not find a javascript runtime. See https://github.com/r
ails/execjs for a list of available runtimes.
Backtrace for gem load error is:
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/execjs-2.7.0/lib/execjs/runtimes.rb:58:in
 `autodetect'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/execjs-2.7.0/lib/execjs.rb:5:in `<module:
ExecJS>'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/execjs-2.7.0/lib/execjs.rb:4:in `<top (re
quired)>'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/uglifier-3.0.0/lib/uglifier.rb:5:in `requ
ire'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/uglifier-3.0.0/lib/uglifier.rb:5:in `<top
 (required)>'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.12.5/lib/bundler/runtime.rb:86:
in `require'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.12.5/lib/bundler/runtime.rb:86:
in `block (2 levels) in require'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.12.5/lib/bundler/runtime.rb:81:
in `each'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.12.5/lib/bundler/runtime.rb:81:
in `block in require'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.12.5/lib/bundler/runtime.rb:70:
in `each'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.12.5/lib/bundler/runtime.rb:70:
in `require'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/bundler-1.12.5/lib/bundler.rb:102:in `req
uire'
C:/Users/New User/sites2/learning_rails/config/application.rb:7:in `<top (requir
ed)>'
C:/Ruby22-x64/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:55:in
 `require'
C:/Ruby22-x64/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:55:in
 `require'
C:/Users/New User/sites2/learning_rails/Rakefile:4:in `<top (required)>'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/rake_module.rb:28:in
 `load'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/rake_module.rb:28:in
 `load_rakefile'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/application.rb:689:i
n `raw_load_rakefile'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/application.rb:94:in
 `block in load_rakefile'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/application.rb:176:i
n `standard_exception_handling'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/application.rb:93:in
 `load_rakefile'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/application.rb:77:in
 `block in run'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/application.rb:176:i
n `standard_exception_handling'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rake-11.1.2/lib/rake/application.rb:75:in
 `run'
C:/Ruby22-x64/lib/ruby/gems/2.2.0/gems/rake-11.1.2/bin/rake:33:in `<top (require
d)>'
C:/Ruby22-x64/bin/rake:22:in `load'
C:/Ruby22-x64/bin/rake:22:in `<main>'
Bundler Error Backtrace:
C:/Users/New User/sites2/learning_rails/config/application.rb:7:in `<top (requir
ed)>'
C:/Users/New User/sites2/learning_rails/Rakefile:4:in `<top (required)>'
ExecJS::RuntimeUnavailable: Could not find a JavaScript runtime. See https://git
hub.com/rails/execjs for a list of available runtimes.
C:/Users/New User/sites2/learning_rails/config/application.rb:7:in `<top (requir
ed)>'
C:/Users/New User/sites2/learning_rails/Rakefile:4:in `<top (required)>'
(See full trace by running task with --trace)

【问题讨论】：

There was an error while trying to load the gem 'uglifier'. (Bundler::GemRequireError)的可能重复

以后，请将错误作为文本而不是屏幕截图。截图无法搜索或复制，阅读不便。

不，它直到现在才起作用。

【参考方案1】：

安装 nodejs

Uglifier 是 JavaScript 压缩器，所以需要 javascript 运行时尝试安装 nodejs

apt-get install nodejs

或

brew install nodejs

如果您使用的是 OSX。

【讨论】：

@AmareshDey 你可以从这里下载node.js [nodejs.org/en/download]，否则你可以按照这个安装指南[blog.teamtreehouse.com/install-node-js-npm-windows]