Ruby on Rails - rake db:migrate 产生错误：“Rake Aborted！未初始化的常量 Bundler”

Question

我是一个全新的 Ruby &导轨程序员。 当我第一次尝试运行 rake 时：

$ rake db:migrate

我收到此错误：

Rake Aborted!
Uninitialized constant Bundler

Looking around here &谷歌搜索，我不知道该怎么办。类似问题的“答案”之一是：“哦，看，ruby 和 rake 安装在不同的 bin 目录中，这就是问题所在。” - 我的情况确实如此，但是解决方案是什么？如何将耙子重新安装到正确的位置？ &这能解决我的问题吗？

$ which ruby
/usr/local/bin/ruby

$ which rake
/usr/bin/rake

$ rake db:migrate --trace
(in /Users/jessephillips/src/rails_projects/demo_app)
rake aborted!
Could not find RubyGem bundler (>= 0)
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:827:in `report_activate_error'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:261:in `activate'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:68:in `gem'
/Users/jessephillips/src/rails_projects/demo_app/config/boot.rb:2
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
/Users/jessephillips/src/rails_projects/demo_app/config/application.rb:1
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
/Users/jessephillips/src/rails_projects/demo_app/Rakefile:4
/Users/jessephillips/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:2383:in `load'
/Users/jessephillips/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:2383:in `raw_load_rakefile'
/Users/jessephillips/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:2017:in `load_rakefile'
/Users/jessephillips/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/Users/jessephillips/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:2016:in `load_rakefile'
/Users/jessephillips/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:2000:in `run'
/Users/jessephillips/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/Users/jessephillips/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
/Users/jessephillips/.gem/ruby/1.8/gems/rake-0.8.7/bin/rake:31
/usr/bin/rake:19:in `load'
/usr/bin/rake:19

Answer 1

您是否安装了bundler？

gem install bundler

然后运行 ​​bundle 或

bundle install

安装所有依赖项

Answer 2

怎么样：

gem install bundler
bundle

然后重试。

Answer 3

这不是耙子的问题。这意味着您必须安装捆绑程序。 Bundler 是一个 gem，它打包了所有项目 gem 依赖项（如果您来自 java 背景，可以将其视为 maven，或者 ant）

从这里获取更多信息（http://gembundler.com/），

您首先需要安装bundler运行你的项目。这是一个很好的入门资源

http://railscasts.com/episodes/201-bundler

希望这有助于

欢呼

为Sameera