Mongoid standalone/embedded

sa_embedded_mongoid_test.rb

require 'mongoid'
require 'minitest/autorun'

Mongoid.configure do |config|
  config.master = Mongo::Connection.new.db('basket_test')
end

class Basket
  include Mongoid::Document

  recursively_embeds_many

  embeds_one :fruit
end

class Fruit
  include Mongoid::Document

  field :name
end

class BasketTest < MiniTest::Unit::TestCase

  def test_an_embedded_basket_can_have_a_fruit
    basket = Basket.create(fruit: Fruit.new(name: 'apple'), child_baskets: [Basket.new])
    basket.reload

    assert_equal 1, basket.child_baskets.size

    embedded_basket = basket.child_baskets.first

    embedded_basket.fruit = Fruit.new(name: 'banana')

    embedded_basket.save!
    basket.reload

    assert ! basket.child_baskets.first.fruit.nil?,
      'The embedded basket\'s fruit is lost.'
  end

  def test_fruits_can_be_standalone_as_well
    Fruit.create(name: 'apple')
  end

end