mongoid-no-rails.rb

require 'mongoid' 

Mongoid::Config.instance.from_hash({"database" => "oid"}) 

class Tweeter 
  include Mongoid::Document 
  field :user 
  embeds_many :tweets 
end 

class Tweet 
  include Mongoid::Document 
  field :status 

  embedded_in :tweeter, :inverse_of => :tweets 
end 

# just create user 
user = Tweeter.new(:user => 'bill') 
user.save 

# create tweet and user 
tweet = Tweet.new(:status => "This is a tweet!") 
tweet.tweeter = Tweeter.new(:user => 'ted') 
tweet.save 

mongoid-no-rails2.rb

require 'mongoid' 

  Mongoid.database = 
Mongo::Connection.new('flame.mongohq.com','27054').db('my_mongo_db') 
  Mongoid.database.authenticate('admin','secret') 


class Tweeter 
  include Mongoid::Document 
  field :user 
  embeds_many :tweets 
end 

class Tweet 
  include Mongoid::Document 
  field :status 

  embedded_in :tweeter, :inverse_of => :tweets 
end 

# just create user 
user = Tweeter.new(:user => 'bill') 
user.save 

# create tweet and user 
tweet = Tweet.new(:status => "This is a tweet!") 
tweet.tweeter = Tweeter.new(:user => 'ted') 
tweet.save