Ruby-on-rails 未初始化的常量 ActiveSupport::Dependencies::Mutex (NameError)
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Uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)
提问by Sokmesa Khiev
When I want to create a Ruby on Rails project, I get the message below.
当我想创建一个 Ruby on Rails 项目时，我收到以下消息。
/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
What has gone wrong? How do I to fix it?
出了什么问题？我该如何解决？
采纳答案by John
This is an incompatibility between Rails 2.3.8 and recent versions of RubyGems. Upgrade to the latest 2.3 version (2.3.11 as of today).
这是 Rails 2.3.8 和最新版本的 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）。
回答by Aaron
In case you can't upgrade to Ruby on Rails 2.3.11 (and to expand on douglasr's answer), threadmust be required at the top of boot.rb. For example:
如果您无法升级到 Ruby on Rails 2.3.11（并扩展 douglasr 的答案），则thread必须在boot.rb. 例如：
require 'thread'
# Don't change this file!
# Configure your app in config/environment.rb and config/environments/*.rb
...
回答by Gary S. Weaver
I was able to fix this by downgrading RubyGems to 1.5.3, since it happens with RubyGems 1.6.0+ and Rails < 2.3.11:
我能够通过将 RubyGems 降级到 1.5.3 来解决这个问题，因为它发生在 RubyGems 1.6.0+ 和 Rails < 2.3.11 中：
gem update --system 1.5.3
If you had previously downgraded to an even earlier version and want to update to 1.5.3, you might get the following when trying to run that:
如果您之前已降级到更早的版本并希望更新到 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
If you get that error, then update, so that it lets you specify the version, and then downgrade again:
如果您收到该错误，请更新，以便您指定版本，然后再次降级：
gem update --system
gem update --system 1.5.3
回答by douglasr
You can also likely get around this issue by requiring 'thread' in your application as such:
您也可以通过在您的应用程序中要求“线程”来解决这个问题：
require 'thread'
As per the RubyGems 1.6.0 release notes.
根据 RubyGems 1.6.0发行说明。
回答by arunagw
If you want to keep your version same like rails will be 2.3.8 and gem version will be latest. You can use this solution Latest gem with Rails2.x. in this some changes in boot.rb file and environment.rb file.
如果你想保持你的版本相同，rails 将是 2.3.8，gem 版本将是最新的。您可以在 Rails2.x 中使用此解决方案最新的 gem。在这个 boot.rb 文件和 environment.rb 文件中的一些变化。
require 'thread' in boot.rb file at the top.
require 'thread' 在顶部的 boot.rb 文件中。
and in environment.rb file add the following code above the initializer block.
并在 environment.rb 文件中在初始化程序块上方添加以下代码。
if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.3.7')
module Rails
class GemDependency
def requirement
r = super
(r == Gem::Requirement.default) ? nil : r
end
end
end
end
回答by Tania R
I have faced this problem in many occassions when I try to start an old rails 2.3.5 project after having worked with rails 3>. In my case to solve the problem, I must do a rubygems update to version 1.4.2, this is:
当我在使用 rails 3> 后尝试启动旧的 rails 2.3.5 项目时，我在很多场合都遇到过这个问题。在我的情况下，要解决这个问题，我必须将 rubygems 更新到 1.4.2 版，这是：
sudo gem update --system 1.4.2
回答by thekingoftruth
If you're using Radiant CMS, simply add
如果您使用的是 Radiant CMS，只需添加
require 'thread'
to the top of config/boot.rb.
到config/boot.rb.
(Kudos to Aaron's and nathanvda's responses.)
（感谢 Aaron 和 nathanvda 的回应。）
回答by Paul Grayson
As mentioned this occurs when using RubyGems 1.6.0 with Ruby on Rails version earlier than version 3. My app is using Ruby on Rails 2.3.3 vendored into the /vendor of the project.
如前所述，当将 RubyGems 1.6.0 与版本 3 之前的 Ruby on Rails 版本一起使用时，会发生这种情况。我的应用程序使用供应商提供给项目 /vendor 的 Ruby on Rails 2.3.3。
No doubt an upgrade of Ruby on Rails to a newer 2.3.X version may also fix this issue. However, this problem prevents you running Raketo unvendor Ruby on Rails and upgrade it.
毫无疑问，将 Ruby on Rails 升级到更新的 2.3.X 版本也可以解决这个问题。但是，此问题会阻止您运行Rake来卸载 Ruby on Rails 并对其进行升级。
Adding require 'thread' to the top of environment.rb did not fix the issue for me. Adding require 'thread' to /vendor/rails/activesupport/lib/active_support.rb did fix the problem.
将 require 'thread' 添加到 environment.rb 的顶部并没有解决我的问题。将 require 'thread' 添加到 /vendor/rails/activesupport/lib/active_support.rb 确实解决了问题。
回答by Andrew Marshall
Try updating your Ruby on Rails version to v3.0.5:
尝试将您的 Ruby on Rails 版本更新到 v3.0.5：
gem install rails --version 3.0.5
or v2.3.11:
或 v2.3.11：
gem install rails --version 2.3.11
If this isn't a new project you'll have to upgrade your application accordingly. If it was a new project, just delete the directory you created it in and create a new project again.
如果这不是一个新项目，您必须相应地升级您的应用程序。如果是新项目，只需删除您创建它的目录并重新创建一个新项目。
回答by Vishnu Atrai
update the rubygems
更新 rubygems
gem update --system
宝石更新--系统
