ruby
require 'spec_helper'

class Sandwich
  include Mongoid::Document
  embeds_many :slices
end

class Slice
  include Mongoid::Document
  field :position, default: 0
  include Mongoid::Document
  embedded_in :sandwiches
end

describe "relationship" do
  it "inc" do
    sandwich = Sandwich.create!
    slice = Slice.new
    sandwich.slices << slice
    Moped.logger = Logger.new(STDOUT)
    Moped.logger.level = Logger::DEBUG
    slice.inc :position, 5
  end
end

  MOPED: 127.0.0.1:27017 UPDATE      
   database=mongoid_test collection=sandwiches selector={"_id"=>"510306c33b55524b26000001", "slices._id"=>"510306c33b55524b26000002"}
   update={"$inc"=>{"slices.0.position"=>5}} flags=[] (0.0811ms)