Setting up MongoDB and Mongoid in Rails 3.1

We need to first set-up the necessary gems:

gem 'mongoid', '~> 2.1'
gem 'bson_ext', '~> 1.4.0'

Then we use mongoid instead of active_record. On your config/application.rb change:

require 'rails/all'

with:

require "action_controller/railtie"
require "action_mailer/railtie"
require "action_resource/railtie"
require "mongoid/railtie"

That’s it. Enjoy!

Originally published at https://www.bootyard.com on November 04, 2011