Primalize vs ActiveModel::Serializer

ams_vs_primalize.rb

require 'active_model'
require 'benchmark/ips'
require 'active_model_serializers'
require 'primalize'
require 'pp'

class Model
  include ActiveModel::Model

  def read_attribute_for_serialization key
    send(key)
  end
end

class Movie < Model
  attr_accessor :id, :title, :actors, :owner, :movie_types

  def actor_ids
    @actor_ids ||= actors.map(&:id)
  end

  def owner_id
    owner.id
  end

  def movie_type_ids
    @movie_type_ids ||= movie_types.map(&:id)
  end
end

class Actor < Model
  attr_accessor :id, :name, :email
end

class User < Model
  attr_accessor :id, :name
end

class MovieType < Model
  attr_accessor :id, :name
end

class MovieSerializer < ActiveModel::Serializer
  attributes :id, :title, :actor_ids, :movie_type_ids, :owner_id
end

class MovieResponseSerializer < ActiveModel::Serializer
  attributes :id, :title, :actor_ids, :movie_type_ids, :owner_id

  has_many :actors
  has_many :movie_types
  belongs_to :owner, class_name: 'User'
end

class ActorSerializer < ActiveModel::Serializer
  attributes :id, :name, :email
end

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

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

class MoviePrimalizer < Primalize::Single
  attributes(
    id: integer,
    title: string,
    actor_ids: array(integer),
    movie_type_ids: array(integer),
    owner_id: integer,
  )
end

class ActorPrimalizer < Primalize::Single
  attributes(
    id: integer,
    name: string,
    email: string,
  )
end

class UserPrimalizer < Primalize::Single
  attributes(
    id: integer,
    name: string,
  )
end

class MovieTypePrimalizer < Primalize::Single
  attributes(
    id: integer,
    name: string,
  )
end

class MoviesResponse < Primalize::Many
  attributes(
    movies: enumerable(MoviePrimalizer),
    actors: enumerable(ActorPrimalizer),
    users: enumerable(UserPrimalizer),
    movie_types: enumerable(MovieTypePrimalizer),
  )
end

def generate_movie
  Movie.new(
    id: rand(1_000_000_000),
    title: 'Star Wars VIII: The Last Jedi',
    actors: Array.new(rand(5)) { generate_actor },
    owner: generate_user,
    movie_types: Array.new(rand(1..4)) { generate_movie_type },
  )
end

def generate_actor
  @actors ||= {}
  @actors[rand(50)] ||= Actor.new(
    id: rand(1_000_000_000),
    name: 'Carrie Fisher',
    email: '[email protected]',
  )
end

def generate_user
  User.new(
    id: rand(1234),
    name: 'Jamie',
  )
end

def generate_movie_type
  @movie_types ||= {}
  @movie_types[rand(10)] ||= MovieType.new(
    id: rand(50),
    name: 'Sci-fi',
  )
end

movie = generate_movie
movies = Array.new(10) { generate_movie }

actors = movies.flat_map(&:actors).uniq
users = movies.flat_map(&:owner).uniq
movie_types = movies.flat_map(&:movie_types).uniq

pp MoviesResponse.new(
  movies: movies,
  actors: actors,
  users: users,
  movie_types: movie_types,
).call

pp ActiveModel::Serializer::CollectionSerializer.new(
  movies.map { |movie| MovieResponseSerializer.new(movie) },
).as_json

puts 'Serialize model to hash'
Benchmark.ips do |x|
  x.report('ams') { MovieSerializer.new(movie).to_h }
  x.report('primalize') { MoviePrimalizer.new(movie).call }
  x.compare!
end

puts 'Serialize model to JSON'
Benchmark.ips do |x|
  x.report('ams') { MovieSerializer.new(movie).to_json }
  x.report('primalize') { MoviePrimalizer.new(movie).to_json }
  x.compare!
end

puts 'Serialize response to hash'
Benchmark.ips do |x|
  x.report 'primalize' do
    MoviesResponse.new(
      movies: movies,
      actors: actors,
      users: users,
      movie_types: movie_types,
    ).call
  end

  x.report 'ams' do
    ActiveModel::Serializer::CollectionSerializer.new(
      movies.map { |movie| MovieResponseSerializer.new(movie) },
    ).as_json
  end

  x.compare!
end

puts 'Serialize response to json'
Benchmark.ips do |x|
  x.report 'ams' do
    ActiveModel::Serializer::CollectionSerializer.new(
      movies.map { |movie| MovieResponseSerializer.new(movie) },
    ).to_json
  end

  x.report 'primalize' do
    MoviesResponse.new(
      movies: movies,
      actors: actors,
      users: users,
      movie_types: movie_types,
    ).to_json
  end

  x.compare!
end

results.txt

Serialize model to hash
Warming up --------------------------------------
                 ams     6.303k i/100ms
           primalize     8.660k i/100ms
Calculating -------------------------------------
                 ams     65.338k (± 4.2%) i/s -    327.756k in   5.025213s
           primalize     90.516k (± 3.5%) i/s -    458.980k in   5.076961s

Comparison:
           primalize:    90515.8 i/s
                 ams:    65338.4 i/s - 1.39x  slower

Serialize model to JSON
Warming up --------------------------------------
                 ams     1.802k i/100ms
           primalize     1.893k i/100ms
Calculating -------------------------------------
                 ams     18.620k (± 4.7%) i/s -     93.704k in   5.044650s
           primalize     18.719k (± 5.2%) i/s -     94.650k in   5.071280s

Comparison:
           primalize:    18719.0 i/s
                 ams:    18619.6 i/s - same-ish: difference falls within error

Serialize response to hash
Warming up --------------------------------------
           primalize   417.000  i/100ms
                 ams    40.000  i/100ms
Calculating -------------------------------------
           primalize      4.170k (± 3.8%) i/s -     20.850k in   5.007414s
                 ams    399.948  (± 3.5%) i/s -      2.000k in   5.006853s

Comparison:
           primalize:     4170.1 i/s
                 ams:      399.9 i/s - 10.43x  slower

Serialize response to json
Warming up --------------------------------------
                 ams    26.000  i/100ms
           primalize    88.000  i/100ms
Calculating -------------------------------------
                 ams    273.387  (± 4.4%) i/s -      1.378k in   5.050290s
           primalize    878.195  (± 4.3%) i/s -      4.400k in   5.019988s

Comparison:
           primalize:      878.2 i/s
                 ams:      273.4 i/s - 3.21x  slower

zzz-ams-output.txt

[{:id=>44720798,
  :title=>"Star Wars VIII: The Last Jedi",
  :actor_ids=>[611411737],
  :movie_type_ids=>[15],
  :owner_id=>1023,
  :actors=>
   [{:id=>611411737,
     :name=>"Carrie Fisher",
     :email=>"[email protected]"}],
  :movie_types=>[{:id=>15, :name=>"Sci-fi"}],
  :owner=>{:id=>1023, :name=>"Jamie"}},
 {:id=>875421260,
  :title=>"Star Wars VIII: The Last Jedi",
  :actor_ids=>[],
  :movie_type_ids=>[16, 11, 15],
  :owner_id=>623,
  :actors=>[],
  :movie_types=>
   [{:id=>16, :name=>"Sci-fi"},
    {:id=>11, :name=>"Sci-fi"},
    {:id=>15, :name=>"Sci-fi"}],
  :owner=>{:id=>623, :name=>"Jamie"}},
 {:id=>433376066,
  :title=>"Star Wars VIII: The Last Jedi",
  :actor_ids=>[815279186, 788172241, 884209915],
  :movie_type_ids=>[10],
  :owner_id=>654,
  :actors=>
   [{:id=>815279186,
     :name=>"Carrie Fisher",
     :email=>"[email protected]"},
    {:id=>788172241,
     :name=>"Carrie Fisher",
     :email=>"[email protected]"},
    {:id=>884209915,
     :name=>"Carrie Fisher",
     :email=>"[email protected]"}],
  :movie_types=>[{:id=>10, :name=>"Sci-fi"}],
  :owner=>{:id=>654, :name=>"Jamie"}},
 {:id=>102665941,
  :title=>"Star Wars VIII: The Last Jedi",
  :actor_ids=>[888714126, 166529544, 333416253],
  :movie_type_ids=>[42, 15, 47, 10],
  :owner_id=>1133,
  :actors=>
   [{:id=>888714126,
     :name=>"Carrie Fisher",
     :email=>"[email protected]"},
    {:id=>166529544,
     :name=>"Carrie Fisher",
     :email=>"[email protected]"},
    {:id=>333416253,
     :name=>"Carrie Fisher",
     :email=>"[email protected]"}],
  :movie_types=>
   [{:id=>42, :name=>"Sci-fi"},
    {:id=>15, :name=>"Sci-fi"},
    {:id=>47, :name=>"Sci-fi"},
    {:id=>10, :name=>"Sci-fi"}],
  :owner=>{:id=>1133, :name=>"Jamie"}},
 {:id=>573742525,
  :title=>"Star Wars VIII: The Last Jedi",
  :actor_ids=>[604190144],
  :movie_type_ids=>[47, 10, 3, 16],
  :owner_id=>334,
  :actors=>
   [{:id=>604190144,
     :name=>"Carrie Fisher",
     :email=>"[email protected]"}],
  :movie_types=>
   [{:id=>47, :name=>"Sci-fi"},
    {:id=>10, :name=>"Sci-fi"},
    {:id=>3, :name=>"Sci-fi"},
    {:id=>16, :name=>"Sci-fi"}],
  :owner=>{:id=>334, :name=>"Jamie"}},
 {:id=>854049375,
  :title=>"Star Wars VIII: The Last Jedi",
  :actor_ids=>[383996039, 207858636, 507621145],
  :movie_type_ids=>[16],
  :owner_id=>961,
  :actors=>
   [{:id=>383996039,
     :name=>"Carrie Fisher",
     :email=>"[email protected]"},
    {:id=>207858636,
     :name=>"Carrie Fisher",
     :email=>"[email protected]"},
    {:id=>507621145,
     :name=>"Carrie Fisher",
     :email=>"[email protected]"}],
  :movie_types=>[{:id=>16, :name=>"Sci-fi"}],
  :owner=>{:id=>961, :name=>"Jamie"}},
 {:id=>649519502,
  :title=>"Star Wars VIII: The Last Jedi",
  :actor_ids=>[407513720, 518936796, 626235837, 815279186],
  :movie_type_ids=>[15],
  :owner_id=>1189,
  :actors=>
   [{:id=>407513720,
     :name=>"Carrie Fisher",
     :email=>"[email protected]"},
    {:id=>518936796,
     :name=>"Carrie Fisher",
     :email=>"[email protected]"},
    {:id=>626235837,
     :name=>"Carrie Fisher",
     :email=>"[email protected]"},
    {:id=>815279186,
     :name=>"Carrie Fisher",
     :email=>"[email protected]"}],
  :movie_types=>[{:id=>15, :name=>"Sci-fi"}],
  :owner=>{:id=>1189, :name=>"Jamie"}},
 {:id=>751495888,
  :title=>"Star Wars VIII: The Last Jedi",
  :actor_ids=>[],
  :movie_type_ids=>[41, 10, 41, 11],
  :owner_id=>550,
  :actors=>[],
  :movie_types=>
   [{:id=>41, :name=>"Sci-fi"},
    {:id=>10, :name=>"Sci-fi"},
    {:id=>41, :name=>"Sci-fi"},
    {:id=>11, :name=>"Sci-fi"}],
  :owner=>{:id=>550, :name=>"Jamie"}},
 {:id=>178887483,
  :title=>"Star Wars VIII: The Last Jedi",
  :actor_ids=>[],
  :movie_type_ids=>[9, 47, 10, 3],
  :owner_id=>411,
  :actors=>[],
  :movie_types=>
   [{:id=>9, :name=>"Sci-fi"},
    {:id=>47, :name=>"Sci-fi"},
    {:id=>10, :name=>"Sci-fi"},
    {:id=>3, :name=>"Sci-fi"}],
  :owner=>{:id=>411, :name=>"Jamie"}},
 {:id=>705400827,
  :title=>"Star Wars VIII: The Last Jedi",
  :actor_ids=>[626235837],
  :movie_type_ids=>[10, 9],
  :owner_id=>185,
  :actors=>
   [{:id=>626235837,
     :name=>"Carrie Fisher",
     :email=>"[email protected]"}],
  :movie_types=>[{:id=>10, :name=>"Sci-fi"}, {:id=>9, :name=>"Sci-fi"}],
  :owner=>{:id=>185, :name=>"Jamie"}}]

zzz-primalize-output.txt

{:movies=>
  [{:id=>44720798,
    :title=>"Star Wars VIII: The Last Jedi",
    :actor_ids=>[611411737],
    :movie_type_ids=>[15],
    :owner_id=>1023},
   {:id=>875421260,
    :title=>"Star Wars VIII: The Last Jedi",
    :actor_ids=>[],
    :movie_type_ids=>[16, 11, 15],
    :owner_id=>623},
   {:id=>433376066,
    :title=>"Star Wars VIII: The Last Jedi",
    :actor_ids=>[815279186, 788172241, 884209915],
    :movie_type_ids=>[10],
    :owner_id=>654},
   {:id=>102665941,
    :title=>"Star Wars VIII: The Last Jedi",
    :actor_ids=>[888714126, 166529544, 333416253],
    :movie_type_ids=>[42, 15, 47, 10],
    :owner_id=>1133},
   {:id=>573742525,
    :title=>"Star Wars VIII: The Last Jedi",
    :actor_ids=>[604190144],
    :movie_type_ids=>[47, 10, 3, 16],
    :owner_id=>334},
   {:id=>854049375,
    :title=>"Star Wars VIII: The Last Jedi",
    :actor_ids=>[383996039, 207858636, 507621145],
    :movie_type_ids=>[16],
    :owner_id=>961},
   {:id=>649519502,
    :title=>"Star Wars VIII: The Last Jedi",
    :actor_ids=>[407513720, 518936796, 626235837, 815279186],
    :movie_type_ids=>[15],
    :owner_id=>1189},
   {:id=>751495888,
    :title=>"Star Wars VIII: The Last Jedi",
    :actor_ids=>[],
    :movie_type_ids=>[41, 10, 41, 11],
    :owner_id=>550},
   {:id=>178887483,
    :title=>"Star Wars VIII: The Last Jedi",
    :actor_ids=>[],
    :movie_type_ids=>[9, 47, 10, 3],
    :owner_id=>411},
   {:id=>705400827,
    :title=>"Star Wars VIII: The Last Jedi",
    :actor_ids=>[626235837],
    :movie_type_ids=>[10, 9],
    :owner_id=>185}],
 :actors=>
  [{:id=>611411737,
    :name=>"Carrie Fisher",
    :email=>"[email protected]"},
   {:id=>815279186,
    :name=>"Carrie Fisher",
    :email=>"[email protected]"},
   {:id=>788172241,
    :name=>"Carrie Fisher",
    :email=>"[email protected]"},
   {:id=>884209915,
    :name=>"Carrie Fisher",
    :email=>"[email protected]"},
   {:id=>888714126,
    :name=>"Carrie Fisher",
    :email=>"[email protected]"},
   {:id=>166529544,
    :name=>"Carrie Fisher",
    :email=>"[email protected]"},
   {:id=>333416253,
    :name=>"Carrie Fisher",
    :email=>"[email protected]"},
   {:id=>604190144,
    :name=>"Carrie Fisher",
    :email=>"[email protected]"},
   {:id=>383996039,
    :name=>"Carrie Fisher",
    :email=>"[email protected]"},
   {:id=>207858636,
    :name=>"Carrie Fisher",
    :email=>"[email protected]"},
   {:id=>507621145,
    :name=>"Carrie Fisher",
    :email=>"[email protected]"},
   {:id=>407513720,
    :name=>"Carrie Fisher",
    :email=>"[email protected]"},
   {:id=>518936796,
    :name=>"Carrie Fisher",
    :email=>"[email protected]"},
   {:id=>626235837,
    :name=>"Carrie Fisher",
    :email=>"[email protected]"}],
 :users=>
  [{:id=>1023, :name=>"Jamie"},
   {:id=>623, :name=>"Jamie"},
   {:id=>654, :name=>"Jamie"},
   {:id=>1133, :name=>"Jamie"},
   {:id=>334, :name=>"Jamie"},
   {:id=>961, :name=>"Jamie"},
   {:id=>1189, :name=>"Jamie"},
   {:id=>550, :name=>"Jamie"},
   {:id=>411, :name=>"Jamie"},
   {:id=>185, :name=>"Jamie"}],
 :movie_types=>
  [{:id=>15, :name=>"Sci-fi"},
   {:id=>16, :name=>"Sci-fi"},
   {:id=>11, :name=>"Sci-fi"},
   {:id=>10, :name=>"Sci-fi"},
   {:id=>42, :name=>"Sci-fi"},
   {:id=>47, :name=>"Sci-fi"},
   {:id=>3, :name=>"Sci-fi"},
   {:id=>41, :name=>"Sci-fi"},
   {:id=>9, :name=>"Sci-fi"},
   {:id=>3, :name=>"Sci-fi"}]}