Making Ruby better at object proxying, so we don't need to add `user_name` etc. for Law of Demeter.

object_proxy.rb

class Object::Proxy < SimpleDelegator
  def initialize(object, **values)
    super(object)
    @values = values
  end

  def method_missing(name, ...)
    @values.fetch(name) { super }
  end
end

module Object::Proxied
  def self.included(klass)
    klass.define_singleton_method(:proxied) { |object = new, **values| Object::Proxy.new(object, **values) }
  end

  def proxied(**values)
    self.class.proxied(self, **values)
  end
end

class User < Data.define(:name, :email_address)
  include Object::Proxied
end

class Post
  # belongs_to :user
  def user = super || build_user.proxied(name: "Unknown")
end

Post.new.user.name  # => "Unknown"
Post.new.user.save! # => true # The User model doesn't have to know about and then guard against "Unknown" being saved to the database.