Example protocol buffer

gistfile1.rb

require 'protocol_buffers'

class User < ProtocolBuffers::Message
  required :string, :name, 1
  required :string, :email, 2
  optional :int32, :logins, 3
end

class Group < ProtocolBuffers::Message
  repeated User, :users, 1
  repeated Group, :subgroups, 2

  module GroupType
    include ProtocolBuffers::Enum
    Study = 1
    Play = 2
  end

  optional GroupType, :group_type, 3
end

user = User.new(name: 'Richard', email: 'haha@email.com', logins: 1)
group = Group.new(:group_type => Group::GroupType::Play)
group.users << user


serialized =  group.serialize_to_string
# "\n\e\n\aRichard\x12\x0Ehaha@email.com\x18\x01\x18\x02"
puts "SERIALIZED: #{serialized.inspect}"

deserialized = Group.parse(serialized)
#<Group users=[#<User name="Richard" email="haha@email.com" logins=1>] subgroups=[] group_type=Play(2)>
puts "DESERIALIZED: #{deserialized.inspect}"