refactoring suggestions for yoshie902a from irc

product.rb

# frozen_string_literal: true

require 'psych'
require 'singleton'

class Product
  include Singleton

  PRODUCTS_CONFIG = Rails.root.join 'config', 'products.yml'
  INSTANCE_VALUES = ->(id, attrs) { [id.to_sym, new(id: id, **attrs.symbolize_keys)] }

  attr_reader :all

  def initialize
    @all = Psych.load_file(PRODUCTS_CONFIG)
                .fetch(Rails.env)
                .to_h(&INSTANCE_VALUES)
  end

  def [](id, &block)
    @all.fetch id&.to_sym, &block
  end

  def member
    self[:member]
  end
end