ruby:BSON序列化和反序列化

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

注意：Ruby散列的值必须能转换为BSON类型，键名必须合法（由null结尾的字符串组成；最大长度为255字节；字符串不能以$开头，不能包含.字符，除结尾处外不能包含null字节）。