# File lib/bson/bson_ruby.rb, line 319
    def deserialize_object_data(buf, opts={})
      size = buf.get_int
      buf.position -= 4
      object = @encoder.new.deserialize(buf.get(size), opts)
      if object.has_key? "$ref"
        DBRef.new(object["$ref"], object["$id"])
      else
        object
      end
    end