MongoMapper ORM for Devise

Installation

Use the rails3 branch of MongoMapper, and add devise-mongo_mapper to your Gemfile

gem 'mongo_mapper',
  :git    => 'git://github.com/jnunemaker/mongomapper',
  :branch => 'rails3'
gem 'devise-mongo_mapper',
  :git    => 'git://github.com/collectiveidea/devise-mongo_mapper

Comment out the current ORM in config/initializers/devise.rb, and add:

require 'devise/orm/mongo_mapper'

Configure your model:

class User
  include MongoMapper::Document
  plugin MongoMapper::Devise
  devise :registerable, :database_authenticatable, :recoverable
end