ruby
require 'spec_helper'

class Collection
  include Mongoid::Document
  embeds_many :things
end

class Thing
  include Mongoid::Document
  field :index
  field :name
  embedded_in :collection  
end

describe Mongoid do
  it "inserts null records" do
    c = Collection.create!
    11.times do |i|
      c.things << Thing.new(index: i, name: "t#{i}")\
    end
    c.things.where({ :index.gt => 9 }).each do |thing|
      thing.update_attributes!({ index: thing.index - 1 })
    end
    c.reload.things.count.should == 11
  end
end

  1) Mongoid inserts null records
     Failure/Error: c.reload.things.count.should == 11
       expected: 11
            got: 101 (using ==)