require 'bson'

doc = {
  _id: BSON::ObjectId.new,  
  username:"kbanker",
  action_code:rand(5),
  time:Time.now.utc,
  n:1
}

bson = doc.to_bson
puts "Document #{doc.inspect} takes up #{bson.length} bytes as BSON"

deserialized_doc = BSON::Document.from_bson(bson);
puts "Here's our document deserialized from BSON:"
puts deserialized_doc.inspect