Zero arity method example for yoshie902a

car.rb

# frozen_string_literal: true

module Enforcement
  def enforce_policy_level(level, meth)
    original_meth = "__original_#{meth}"
    alias_method original_meth, meth

    define_method meth do
      content = public_send original_meth
      return content if current_user_level >= level

      secure_text(content)
    end
  end
end

class Car
  extend Enforcement

  enforce_policy_level 1, def title
    'Car Title'
  end

  private

  def secure_text(text)
    'X' * text.size
  end

  def current_user_level
    rand 0..2
  end
end

Car.new.title
#=> "XXXXXXXXX"