Ruby 未初始化的常量ActiveSupport:：CoreExtensions:：Date:：Calculations

我不熟悉ruby、rails和mysql

我的操作系统是Ubuntu 13.04，ruby的版本是1.9.3p194（2012-04-20修订版35410）[x86_64-linux]，rails的版本是3.2.13

当我执行以下命令时：

rake db:migrate--trace

，我遇到了这样的错误：

rake aborted!
uninitialized constant ActiveSupport::CoreExtensions::Date::Calculations
/usr/lib/ruby/vendor_ruby/active_support/core_ext/date.rb:8:in `<class:Date>'
/usr/lib/ruby/vendor_ruby/active_support/core_ext/date.rb:6:in `<top (required)>'
/var/lib/gems/1.9.1/gems/date_time_precision-0.5.3/lib/date_time_precision/lib.rb:4:in `block in <top (required)>'
/var/lib/gems/1.9.1/gems/date_time_precision-0.5.3/lib/date_time_precision/lib.rb:2:in `each'
/var/lib/gems/1.9.1/gems/date_time_precision-0.5.3/lib/date_time_precision/lib.rb:2:in `<top (required)>'
/var/lib/gems/1.9.1/gems/date_time_precision-0.5.3/lib/date_time_precision/patch.rb:1:in `<top (required)>'
/var/lib/gems/1.9.1/gems/date_time_precision-0.5.3/lib/date_time_precision.rb:1:in `<top (required)>'
/var/lib/gems/1.9.1/gems/bundler-1.5.2/lib/bundler/runtime.rb:76:in `require'
/var/lib/gems/1.9.1/gems/bundler-1.5.2/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
/var/lib/gems/1.9.1/gems/bundler-1.5.2/lib/bundler/runtime.rb:72:in `each'
/var/lib/gems/1.9.1/gems/bundler-1.5.2/lib/bundler/runtime.rb:72:in `block in require'
/var/lib/gems/1.9.1/gems/bundler-1.5.2/lib/bundler/runtime.rb:61:in `each'
/var/lib/gems/1.9.1/gems/bundler-1.5.2/lib/bundler/runtime.rb:61:in `require'
/var/lib/gems/1.9.1/gems/bundler-1.5.2/lib/bundler.rb:131:in `require'
/home/xye/Documents/Work/config/application.rb:14:in `<top (required)>'
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
/home/xye/Documents/Work/Rakefile:5:in `<top (required)>'
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/rake_module.rb:25:in `load'
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/rake_module.rb:25:in `load_rakefile'
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:583:in `raw_load_rakefile'
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:89:in `block in load_rakefile'
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:160:in `standard_exception_handling'
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:88:in `load_rakefile'
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:72:in `block in run'
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:160:in `standard_exception_handling'
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:70:in `run'
/var/lib/gems/1.9.1/gems/rake-10.0.3/bin/rake:33:in `<top (required)>'
/usr/local/bin/rake:23:in `load'
/usr/local/bin/rake:23:in `<main>'

rake中止！
未初始化的常量ActiveSupport:：CoreExtensions:：Date:：Calculations
/usr/lib/ruby/vendor\u ruby/active\u support/core\u ext/date.rb:8:in`'
/usr/lib/ruby/vendor\u ruby/active\u support/core\u ext/date.rb:6:in`'
/var/lib/gems/1.9.1/gems/date\u time\u precision-0.5.3/lib/date\u time\u precision/lib.rb:4:in“block in”
/var/lib/gems/1.9.1/gems/date\u time\u precision-0.5.3/lib/date\u time\u precision/lib.rb:2:在'each'中
/var/lib/gems/1.9.1/gems/date\u time\u precision-0.5.3/lib/date\u time\u precision/lib.rb:2:in`'
/var/lib/gems/1.9.1/gems/date\u time\u precision-0.5.3/lib/date\u time\u precision/patch.rb:1:in`'
/var/lib/gems/1.9.1/gems/date\u time\u precision-0.5.3/lib/date\u time\u precision.rb:1:in`'
/var/lib/gems/1.9.1/gems/bundler-1.5.2/lib/bundler/runtime.rb:76:in'require'
/var/lib/gems/1.9.1/gems/bundler-1.5.2/lib/bundler/runtime.rb:76:“请求中的块（2个级别）”中
/var/lib/gems/1.9.1/gems/bundler-1.5.2/lib/bundler/runtime.rb:72:在'each'中
/var/lib/gems/1.9.1/gems/bundler-1.5.2/lib/bundler/runtime.rb:72:在'block in require'中
/var/lib/gems/1.9.1/gems/bundler-1.5.2/lib/bundler/runtime.rb:61:in'each'
/var/lib/gems/1.9.1/gems/bundler-1.5.2/lib/bundler/runtime.rb:61:in'require'
/var/lib/gems/1.9.1/gems/bundler-1.5.2/lib/bundler.rb:131:in'require'
/home/xye/Documents/Work/config/application.rb:14:in`'
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in'require'
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in'require'
/主页/xye/Documents/Work/Rakefile:5:in`'
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/rake_module.rb:25:in'load'
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/rake_module.rb:25:in'load_rakefile'
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:583:in'raw\u load\u rakefile'
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:89:“加载中的块\u rakefile”
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:160:在“标准异常处理”中
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:88:in'load_rakefile'
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:72:在“运行中的块”中
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:160:在“标准异常处理”中
/var/lib/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:70:in'run'
/var/lib/gems/1.9.1/gems/rake-10.0.3/bin/rake:33:in`'
/usr/local/bin/rake:23:在“装载”中
/usr/local/bin/rake:23:in`'

---

这很奇怪，我不知道怎么处理。有什么想法吗？

名为

date\u time\u precision

的gem与主动支持冲突

从

date\u time\u precision

文档：

    Gem Compatibility

Sometimes other gems will use the Date/Time class in ways that don't preserve precision. If you want to use the DateTimePrecision gem with these gems, any compatibility issues will most likely need to be patched within DateTimePrecision itself. This is because DateTimePrecision makes some modifications to how the core Date/Time classes work. (For example, by allowing nil values to be passed to constructors.)

This gem should work with Rails/ActiveSupport 2, 3, and 4 (but perhaps missing some edge cases).

So far, the following gems are on the compatibility watch list:

    [.] ActiveSupport
    [x] Virtus
    [x] Coercible
    [ ] Chronic
    [ ] Timeliness
    [ ] Timecop
    [ ] delocalize

---

如果您没有信心自己修复此宝石，则应将其移除。

谢谢您的回复。我试图从我的GEM文件中删除日期时间精度，这个错误消失了，但另一个问题出现了。然后我尝试了我的旧ubuntu 12.04，它成功了。我在想为什么会这样。再次感谢！