ruby-on-rails - 在 Rails 3.2 中使用 Mongoid 时删除 database.yml

Question

我刚刚开始了一个新的 Rails 项目，想通过 Mongoid gem 使用 MongoidDB。按照 Mongoid 网站上的说明，我在 Gemfile 中添加了以下几行:

gem "mongoid", "~> 2.4"
gem "bson_ext", "~> 1.5"

然后我按照说明 here 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，当我在开发中使用 rails s 启动服务器时，出现以下错误:

~/.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 #<Rails::Application::Configuration:0x007ff38b20d0b0> (NoMethodError)

我尝试寻找解决方案，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？

感谢您的帮助!

更新(1 月 26 日):根据 Dylan Markow 提供的信息，我使用了终端命令

grep -r active_record config/

并将所有对 active_record 的引用放在评论 block 中。

我有一个简单的 Controller ，其中一个操作甚至还没有命中数据库。当我通过浏览器访问操作时，我得到

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)

如何解决上述问题？为什么还要尝试建立 ActiveRecord 数据库连接？

再次感谢!

Answer 1

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