Strict mode of `composed_of` in Ruby on Rails

strict_composed_of.rb

ApplicationRecord.singleton_class.prepend(Module.new do
  def composed_of(part_id, options = {})
    super(part_id, options.except(:strict))
    return if !options[:strict] || !options[:mapping]

    options[:mapping].flatten.each_slice(2) do |attr_name, _|
      next if attr_name.to_sym == part_id.to_sym

      define_method("#{attr_name}=") do |_val|
        raise "Can't change the attributes mapped to `#{part_id}` directly."
      end
    end
  end
end)