Example for Ruby JSON.parse option create_additions?

json_create_additions_example.rb

require 'json'

class Person
  attr_accessor :name, :age

  def initialize(name, age)
    @name = name
    @age = age
  end

  def to_json(options = {})
    {
      'json_class' => self.class.name,
      'data' => { 'name' => name, 'age' => age },
    }.to_json(options)
  end

  def self.json_create(a_hash)
    new(a_hash['data']['name'], a_hash['data']['age'])
  end
end

alice = Person.new 'Alice', 42 # => #<Person:0x0000... @name="Alice", @age=42> 

jsoned_alice = alice.to_json        # => '{"json_class": "Person", "data": {"name": "Alice", "age": 42}}'
jsoned_alice = JSON.generate(alice) # => '{"json_class": "Person", "data": {"name": "Alice", "age": 42}}' (Same)

reconstructed_alice = JSON.parse jsoned_alice, create_additions: true # => #<Person:0x0000... @name="Alice", @age=42> 

reconstructed_alice.name # => "Alice"
alice.name # => "Alice"

reconstructed_alice.name == alice.name           # => true
reconstructed_alice.age == alice.age             # => true
reconstructed_alice == alice                     # => false
reconstructed_alice.object_id == alice.object_id # => false