gistfile1.rb

require 'rubygems'
require 'bundler/setup'
require 'active_model_serializers'
require 'benchmark'

class BadgeType < Struct.new(:id, :name)
  include ActiveModel::SerializerSupport
end

class Badge < Struct.new(:id, :name, :badge_type)
  include ActiveModel::SerializerSupport
end

class UserBadge < Struct.new(:id, :badge, :granted_by)
  include ActiveModel::SerializerSupport
end

class User < Struct.new(:id, :name, :email, :user_badges)
  include ActiveModel::SerializerSupport
end

class BadgeTypeSerializer < ActiveModel::Serializer
  attributes :id, :name
end

class BadgeSerializer < ActiveModel::Serializer
  attributes :id, :name
  has_one :badge_type, embed: :ids, include: true
end

class UserBadgeSerializer < ActiveModel::Serializer
  attributes :id
  has_one :badge, embed: :ids, include: true
  has_one :granted_by, embed: :ids, include: true
end

class UserSerializer < ActiveModel::Serializer
  attributes :id, :name, :email
  has_many :user_badges, embed: :ids, include: true
end

badge_types = []
3.times {|i| badge_types.push BadgeType.new(i, "Badge Type #{i}") }
badges = []
5000.times {|i| badges.push Badge.new(i, "Badge #{i}", badge_types.sample) }
granters = []
5.times {|i| granters.push User.new(i, "Granter #{i}", "granter#{i}@example.com", []) }
user = User.new(5, "User", "[email protected]", [])
user_badges = badges.map.with_index {|x, i| UserBadge.new(i, x, granters.sample) }
user.user_badges = user_badges

puts "AMS version: #{ActiveModel::Serializer::VERSION}"

Benchmark.bmbm do |x|
  x.report("serialize badges") { 100.times { ActiveModel::ArraySerializer.new(badges).as_json } }
  x.report("serialize user_badges") { 100.times { ActiveModel::ArraySerializer.new(user_badges).as_json } }
  x.report("serialize user") { UserSerializer.new(user).as_json }
end