未初始化的常量ActiveSupport :: Dependencies :: Mutex

Question

当我想创建一个Ruby on Rails项目时，我得到以下消息。/usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:55: uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'    from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support.rb:57    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'    from /usr/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/rails_generator.rb:31    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'    from /usr/lib/ruby/gems/1.8/gems/rails-2.3.8/bin/rails:15    from /usr/bin/rails:19:in `load'    from /usr/bin/rails:19出了什么问题？我该如何解决？ruby-on-rails rubygems 兼容性

Answer 1

这是Rails 2.3.8与最新版本的RubyGems之间的不兼容。升级到最新的2.3版本（截至今天为2.3.11）。

Answer 2

如果您不能升级到Ruby on Rails 2.3.11（并扩展douglasr的答案），则thread必须在的顶部boot.rb。例如：

require 'thread'

# Don't change this file!

# Configure your app in config/environment.rb and config/environments/*.rb

...

Answer 3

我能够通过将RubyGems降级到1.5.3来解决此问题，因为它发生在RubyGems 1.6.0+和Rails <2.3.11中：

gem update --system 1.5.3

如果您以前已降级到甚至更早的版本，并想更新到1.5.3，则在尝试运行该版本时可能会得到以下信息：

Updating RubyGems

ERROR:  While executing gem ... (RuntimeError)

    No gem names are allowed with the --system option

如果遇到该错误，请进行更新，以便您指定版本，然后再次降级：

gem update --system

gem update --system 1.5.3