Mongoid bug

gistfile1.rb

require "rubygems"
require "bson"
require "mongoid"
require 'ap'


Mongoid.configure do |config|
  name = "test"
  host = "localhost"
  config.allow_dynamic_fields = false
  config.master = Mongo::Connection.new.db(name)
end


class User
  include Mongoid::Document
  field :name, :type => String
  has_many     :own_projects, :class_name=>'Project', :dependent=>:destroy
end

class Project
  include Mongoid::Document
  field :title, :type => String
  belongs_to    :owner, :class_name=>"User", :foreign_key=>:user_id
  embeds_many   :logs do
    def start(msg, uid)
      @target << FirstLog.new(title: msg, uid: uid)
    end
  end
  
  after_create  :add_start
  private
  def add_start
    self.logs.start("Project created", owner._id)
  end
end

class Log
  include Mongoid::Document
  include Mongoid::Timestamps::Created
  
  field :title, :type => String
  field :uid,   :type=>BSON::ObjectId
  
  embedded_in :project

end

  class FirstLog  < Log; end

  class SecondLog < Log; end


user = User.create(name: "Foo")
project = user.own_projects.create(title: "Proj1")
project.save

project.logs.start("start", user._id)
project.logs << SecondLog.new(title: "stop")

project.save

ap user
ap project
ap project.logs