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I just began a new rails project and wanted to use MongoidDB thru the Mongoid gem. Following the instructions on the Mongoid site, I added the following lines to my Gemfile : gem "mongoid", "~> 2.4" gem "bson_ext", "~> 1.5" I then proceeded to removing my database.yml file as per the instructions here . My application.rb file now looks like so: 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+ Now, when I use rails s to start my server in development, I get the following errors: ~/.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) I tried looking for a solution, but it seems no one has yet to come across my problem. Am I doing something wrong? Is this caused by the recent Rails 3.2 update? Thanks for your help! UPDATE (Jan 26): Based on the info from Dylan Markow, I used the terminal command grep -r active_record config/ And put any refrences to active_record in comment blocks. I have a simple controller with one action that does not even hit the database yet. When I access the action via browser I get 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' activerecor

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