easy-going-rails/lib/monkey_patches/monkey_patcher.rb

class MonkeyPatcher
  class << self
    MONKEY_PATCHES = Rails.root.join('lib', 'monkey_patches')
    def run(&)
      patches = Dir.glob(MONKEY_PATCHES.join('**', '*.rb'))
      patches.each do |patch|
        file = Pathname.new(patch).relative_path_from(MONKEY_PATCHES).to_s
        next if file == 'monkey_patcher.rb' # filter off its own file!

        if !block_given? || yield(file)
          puts "🐵 patching... #{file}"
          require file
        end
      end
    end
  end
end