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我最近将我的 Rails 数据库从 sqlite3 切换到了 mysql，自从这样做以来，我在尝试访问我的服务器时遇到了 ConnectionNotEstablished 错误。

这是错误的完整堆栈跟踪。

ActiveRecord::ConnectionNotEstablished (ActiveRecord::ConnectionNotEstablished):
  activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:404:in `retrieve_connection'
  activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_specification.rb:170:in `retrieve_connection'
  activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_specification.rb:144:in `connection'
  activerecord (3.2.8) lib/active_record/query_cache.rb:67:in `rescue in call'
  activerecord (3.2.8) lib/active_record/query_cache.rb:61:in `call'
  activerecord (3.2.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:473:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
  activesupport (3.2.8) lib/active_support/callbacks.rb:405:in `_run__318842653__call__302530175__callbacks'
  activesupport (3.2.8) lib/active_support/callbacks.rb:405:in `__run_callback'
  activesupport (3.2.8) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
  activesupport (3.2.8) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (3.2.8) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/reloader.rb:65:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
  railties (3.2.8) lib/rails/rack/logger.rb:26:in `call_app'
  railties (3.2.8) lib/rails/rack/logger.rb:16:in `call' 
  actionpack (3.2.8) lib/action_dispatch/middleware/request_id.rb:22:in `call'
  rack (1.4.1) lib/rack/methodoverride.rb:21:in `call'
  rack (1.4.1) lib/rack/runtime.rb:17:in `call'
  activesupport (3.2.8) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
  rack (1.4.1) lib/rack/lock.rb:15:in `call'
  actionpack (3.2.8) lib/action_dispatch/middleware/static.rb:62:in `call'
  railties (3.2.8) lib/rails/engine.rb:479:in `call'
  railties (3.2.8) lib/rails/application.rb:223:in `call'
  rack (1.4.1) lib/rack/content_length.rb:14:in `call'
  railties (3.2.8) lib/rails/rack/log_tailer.rb:17:in `call'
  rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service'
  /home/aaron/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
  /home/aaron/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
  /home/aaron/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'

与数据库的连接似乎工作正常。我可以运行 db:migrate 并且它运行良好，以及 Rails 控制台，我可以访问数据和一切都很好。我注意到，当我启动时，错误的工作方式会因环境而略有不同。它似乎在测试中运行良好。在开发中，当我在浏览器中访问页面时会引发错误，而在生产中，当我启动它时会引发错误。

这个问题似乎与这里提出的问题几乎相同： Rails and MySQL - ActiveRecord::ConnectionNotEstablished in production environment，但没有一个答案对我有用。

我把所有的代码都推到这里了：https ://github.com/Aaronneyer/aaronneyer.com

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2 回答 2

2

仍然不确定造成这种情况的确切原因是什么，但我能够通过移除不再使用的 newrelic gem 来解决它。

于 2012-08-25T13:38:20.570 回答
0

您有套接字和主机设置。选择一个，可能会解决您的问题。

于 2012-08-23T03:35:19.663 回答