在Rails 3.2中使用Mongoid时删除database.yml
我刚开始一个新的rails项目，想通过Mongoid gem使用MongoidDB。 按照Mongoid站点上的说明，我将以下行添加到我的Gemfile ：
gem "mongoid", "~> 2.4" gem "bson_ext", "~> 1.5"
然后我按照此处的说明继续删除我的database.yml文件。 我的application.rb文件现在看起来像这样：
require "action_controller/railtie" require "action_mailer/railtie" require "active_resource/railtie" require "rails/test_unit/railtie" require "sprockets/railtie" # Uncomment this line for Rails 3.1+
现在，当我使用rails s在开发中启动我的服务器时，我收到以下错误：
~/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.0/lib/rails/railtie/configuration.rb:85:in `method_missing': undefined method `active_record' for # (NoMethodError)
我试着找一个解决方案，但似乎还没有人遇到我的问题。 难道我做错了什么？ 这是由最近的Rails 3.2更新引起的吗？
谢谢你的帮助！
更新（1月26日）：根据Dylan Markow的信息，我使用了终端命令
grep -r active_record config/
并在评论块中将任何引用放入active_record。
我有一个简单的控制器，其中一个动作甚至还没有打到数据库。 当我通过浏览器访问操作时，我得到了
ActiveRecord::ConnectionNotEstablished (ActiveRecord::ConnectionNotEstablished): activerecord (3.2.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:374:in `retrieve_connection' activerecord (3.2.0) lib/active_record/connection_adapters/abstract/connection_specification.rb:168:in `retrieve_connection' activerecord (3.2.0) lib/active_record/connection_adapters/abstract/connection_specification.rb:142:in `connection' activerecord (3.2.0) lib/active_record/query_cache.rb:67:in `rescue in call' activerecord (3.2.0) lib/active_record/query_cache.rb:61:in `call' activerecord (3.2.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:443:in `call' actionpack (3.2.0) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' activesupport (3.2.0) lib/active_support/callbacks.rb:405:in `_run__186077810047649794__call__2115495702768811851__callbacks' activesupport (3.2.0) lib/active_support/callbacks.rb:405:in `__run_callback' activesupport (3.2.0) lib/active_support/callbacks.rb:385:in `_run_call_callbacks' activesupport (3.2.0) lib/active_support/callbacks.rb:81:in `run_callbacks' actionpack (3.2.0) lib/action_dispatch/middleware/callbacks.rb:27:in `call' actionpack (3.2.0) lib/action_dispatch/middleware/reloader.rb:65:in `call' actionpack (3.2.0) lib/action_dispatch/middleware/remote_ip.rb:31:in `call' actionpack (3.2.0) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' actionpack (3.2.0) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' railties (3.2.0) lib/rails/rack/logger.rb:26:in `call_app' railties (3.2.0) lib/rails/rack/logger.rb:16:in `call' actionpack (3.2.0) 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 (3.2.0) lib/active_support/cache/strategy/local_cache.rb:72:in `call' rack (1.4.1) lib/rack/lock.rb:15:in `call' actionpack (3.2.0) lib/action_dispatch/middleware/static.rb:53:in `call' railties (3.2.0) lib/rails/engine.rb:479:in `call' railties (3.2.0) lib/rails/application.rb:220:in `call' rack (1.4.1) lib/rack/content_length.rb:14:in `call' railties (3.2.0) lib/rails/rack/log_tailer.rb:14:in `call' rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service' /Users/aren/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service' /Users/aren/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run' /Users/aren/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread' Rendered /Users/aren/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.0/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.8ms) Rendered /Users/aren/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.0/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (39.4ms) Rendered /Users/aren/.rvm/gems/ruby-1.9.2-p290/gems/actionpack-3.2.0/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (54.0ms)
我该如何解决上述问题？ 为什么甚至尝试建立ActiveRecord数据库连接？
再次感谢！
也许评论这两行
config/environments/development.rb: # config.active_record.mass_assignment_sanitizer = :strict # config.active_record.auto_explain_threshold_in_seconds = 0.5
您可能在配置文件夹（ development.rb ， test.rb等）中的某处设置了一些config.active_record设置。 由于您没有使用ActiveRecord，因此您需要注释掉这些设置。
您可以在项目文件夹中执行类似grep -r active_record config/ ，以查找引用active_record文件。
更新 ：确保您已从config/application.rb删除了require 'rails/all'行。 您添加的新require行应该替换该行。 否则， rails/all仍会加载ActiveRecord。