field_purge_field_storage

field_purge_field_storage(FieldStorageConfigInterface $field_storage)

function field_purge_field_storage(FieldStorageConfigInterface $field_storage) {
  $fields = entity_load_multiple_by_properties('field_config', array('field_storage_uuid' => $field_storage->uuid(), 'include_deleted' => TRUE));
  if (count($fields) > 0) {
    throw new FieldException(t('Attempt to purge a field storage @field_name that still has fields.', array('@field_name' => $field_storage->getName())));
  }

  $state = \Drupal::state();
  $deleted_storages = $state->get('field.storage.deleted');
  unset($deleted_storages[$field_storage->uuid()]);
  $state->set('field.storage.deleted', $deleted_storages);

  // Notify the storage layer.
  \Drupal::entityManager()->getStorage($field_storage->getTargetEntityTypeId())->finalizePurge($field_storage);

  // Invoke external hooks after the cache is cleared for API consistency.
  \Drupal::moduleHandler()->invokeAll('field_purge_field_storage', array($field_storage));
}