forwardable

delegate_json.rb

require 'json'
require 'ostruct'
require 'forwardable'

class Person
  extend Forwardable

  # I want to delegate all the methods
  delegate [:firstname] => :@ostruct

  def initialize(json)
    @json = json
    @ostruct = JSON.parse(json, object_class: OpenStruct)
  end
end

json_string = '{"firstname":"jeff", "lastname":"durand", "address": { "street":"22 charlotte rd", "zipcode":"01013", "residents": 3 }}'
p = Person.new(json_string)

p p.class
p p.firstname