是否可以递归地要求Ruby中的目录中的所有文件？

def get_all_files(dir)
  files = []
  Dir.foreach(dir) do |entry|
    next if entry == '.' || entry == '..'
    path = File.join(dir, entry)
    if File.directory?(path)
      files += get_all_files(path)
    else
      files<< path
    end
  end
  files
end

dir_path = 'path/to/directory'
all_files = get_all_files(dir_path)
puts all_files.inspect