ams.rb

require 'bundler/inline'

gemfile true do
  source 'https://rubygems.org'
  gem 'active_model_serializers', github: 'rails-api/active_model_serializers', ref: 'd30aa4c'
end
print "==================================================\n\n"

class Shoe
  attr_accessor :id, :name, :vendor
  def initialize(args)
    args.each{ |k,v| send("#{k}=",v)}
  end
  alias read_attribute_for_serialization public_send
end

class ShoeSerializer < ActiveModel::Serializer
  type "shoe"

  attribute :id
  attribute :name
  attribute :vendor
end

shoe = Shoe.new(id: 3, name: "samba", vendor: "adidas")

require 'json'
print ActiveModelSerializers::SerializableResource.new(shoe,
                                                       adapter:   :json_api,
                                                      ).to_json

print "\n==================================================\n"
print ActiveModelSerializers::SerializableResource.new(shoe,
                                                       adapter:   :json_api,
                                                      ).as_json.to_json

# require 'active_support/json/encoding'
module ActiveModelSerializers
  module Adapter
    class Base
      def to_json(options=nil)
        as_json(options).to_json
      end
    end
  end
end
print "\n==================================================\n"
print ActiveModelSerializers::SerializableResource.new(shoe,
                                                       adapter:   :json_api,
                                                      ).to_json

__END__
==================================================

[active_model_serializers] Rendered ShoeSerializer with ActiveModelSerializers::Adapter::JsonApi (0.06ms)
"#<ActiveModelSerializers::Adapter::JsonApi:0x0055ad9b412820>"
==================================================
[active_model_serializers] Rendered ShoeSerializer with ActiveModelSerializers::Adapter::JsonApi (3.09ms)
{"data":{"id":"3","type":"shoe","attributes":{"name":"samba","vendor":"adidas"}}}
==================================================
[active_model_serializers] Rendered ShoeSerializer with ActiveModelSerializers::Adapter::JsonApi (0.34ms)
{"data":{"id":"3","type":"shoe","attributes":{"name":"samba","vendor":"adidas"}}}