TypeError: неявное преобразование Symbol в Integer при циклическом просмотре массива hash

Question

Я хочу перебрать массив хэшей, но я продолжаю получать TypeError: неявное преобразование Symbol в целочисленную ошибку.Когда я печатаю значения, они отображаются, как и ожидалось, но я получаю ошибку независимо.

  $portal_automation_version_set = 'PhotonPortalUIAutomation/development'
  $package = 'PhotonUIAutomationTests-1.0'
  $todworker = 'TodWorker/Photon/Prod'
  $one_drive_test_name = 'One drive tests'
  $gdrive_test_name = 'Gdrive storage tests'
  $streaming_test_name = 'Portal streaming tests'
  $beta_sanity_test_name = 'Beta-pdx Sanity'
  $one_drive_test_target = '-Dtestngfile=portal-onedrive-storage-test.xml run-fire-test'
  $gdrive_test_target = '-Dtestngfile=portal-storage-sanity-test.xml run-fire-test'
  $streaming_test_target = '-Dtestngfile=portal-streaming-tests.xml run-fire-test'
  $beta_sanity_test_target  = '-Dtestngfile=portal-smoke-tests.xml run-fire-test'

  $stage_sanity_test_map = {
    Beta:
    [
      {
          sanity_test_name: $one_drive_test_name,
          sanity_test_target: $one_drive_test_name,
          depends_on: nil
      },
      {
          sanity_test_name: $gdrive_test_name,
          sanity_test_target: $gdrive_test_target,
          depends_on: $one_drive_test_name
      },
      {
          sanity_test_name: $streaming_test_name,
          sanity_test_target: $streaming_test_target,
          depends_on: $gdrive_test_name
      },
      {
          sanity_test_name: $beta_sanity_test_name,
          sanity_test_target: $beta_sanity_test_target,
          depends_on: $streaming_test_name
      }
    ]
  }

        $stage_sanity_test_map[:Beta].each do | key |
          puts key[:sanity_test_name]
        end