issue-72.rb

require 'mongoid'
require 'rspec'

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

class Inventory
  include Mongoid::Document

  field :item_name
  field :codes, :type => Array

  key :item_name

  def add_code(code)
    if codes.nil? || codes.class != Array
      self.codes = []
    end

    self.codes << code
  end

  collection.remove
end


inv = Inventory.create(:item_name => "1")
inv.add_code('foo')
inv.save.should == true

Inventory.first.codes.should == ['foo']