BENCHMARKS: How to create fast JSON serialization in Rails?

active_model_serializers.rb

# post_serializer.rb

class PostSerializer < ActiveModel::Serializer
  has_many :comments

  attributes :id, :title, :content
end

# comment_serializer.rb

class CommentSerializer < ActiveModel::Serializer
  attributes :id, :body, :author
end

# Benchmark

posts = Post.eager_load(:comments).all

puts Benchmark.measure {
  posts.map { |post| PostSerializer.new(post).as_json }
}

fast_json_api.rb

# post_serializer.rb

class PostSerializer
  include FastJsonapi::ObjectSerializer
  attributes :title, :content
  has_many :comments
end

# comment_serializer.rb

class CommentSerializer
  include FastJsonapi::ObjectSerializer
  attributes :id, :body, :author
end

# Benchmark

posts = Post.eager_load(:comments).all

puts Benchmark.measure {
  posts.map { |post| PostSerializer.new(post, include: [:comments]).serializable_hash }
}

jbuilder.rb

# post2.json.jbuilder

json.id post.id
json.title post.title
json.content post.content

json.comments(post.comments) do |comment|
  json.id comment.id
  json.author comment.author
  json.body comment.body
end

# Benchmark

posts = Post.eager_load(:comments).all

renderer = ApplicationController.new

puts Benchmark.measure {
  posts.map { |post| renderer.render_to_string('/post2', locals: {post: post}) }
}

json_api_rb.rb

# post_serializer.rb

class PostSerializer < JSONAPI::Serializable::Resource
  type 'posts'
  has_many :comments
  attributes :id, :title, :content
end

# comment_serializer.rb

class CommentSerializer < JSONAPI::Serializable::Resource
  type 'comments'

  attributes :id, :author, :body
end

# Benchmark

posts = Post.eager_load(:comments).all

renderer = JSONAPI::Serializable::Renderer.new

puts Benchmark.measure {
  posts.map { |post| renderer.render(post, class: { Post: PostSerializer, Comment: CommentSerializer }, include: [:comments]) }
}

json_api_resources.rb

# post_resource.rb

class PostResource < JSONAPI::Resource
  has_many :comments
  attributes :title, :content
end

# comment_resource.rb

class CommentResource < JSONAPI::Resource
  attributes :author, :body
end

# Benchmark

posts = Post.eager_load(:comments).all

puts Benchmark.measure {
  posts.map { |post| JSONAPI::ResourceSerializer.new(PostResource, include: ['comments']).serialize_to_hash(PostResource.new(post, nil)) }
}

json_api_serializers.rb

# post_serializer.rb

class PostSerializer
  include JSONAPI::Serializer

  attribute :id
  attribute :title
  attribute :content

  has_many :comments
end

# comment_serializer.rb

class CommentSerializer
  include JSONAPI::Serializer

  attribute :id
  attribute :author
  attribute :body
end

# Benchmark

posts = Post.eager_load(:comments).all

puts Benchmark.measure {
  posts.map { |post| JSONAPI::Serializer.serialize(post, include: ['comments']) }
}

rabl.rb

# post.rabl

object @job

attributes :id, :title, :content

child :comments do
  extends "comment"
end

# comment.rabl

object @comment

attributes :id, :author, :body

# Benchmark

posts = Post.eager_load(:comments).all

puts Benchmark.measure {
  posts.map { |post| Rabl.render(post, 'post', :view_path => 'app/views', :format => :hash) }
}