/**
 * Set value for field_seccion_general to the nodes that not have this field set.
 */
function incae_custom_functions_update_7003(&$sandbox) {

  if (!isset($sandbox['progress'])) {
    $entities = incae_custom_functions_get_unset_field_seccion_genenal_entities('node');
    $sandbox['max'] = count($entities) - 1;
    $sandbox['limit'] = 100;
    $sandbox['entities'] = array_values(node_load_multiple($entities));
    $sandbox['progress'] = 0;
  }
  watchdog('sandbox p', serialize($sandbox['progress']));
  $chunk = array_slice($sandbox['entities'], $sandbox['progress'], $sandbox['limit']);
  if (count($chunk)) {
    foreach ($chunk as $key => $entity) {
      $wrapper = entity_metadata_wrapper('node', $entity);
      $wrapper->field_seccion_general = array('masters');
      $wrapper->save();
      $sandbox['progress'] = $key;
      if ($key == $sandbox['max']) {
        $sandbox['#finish'] = 1;
      }
      else {
        $sandbox['#finish'] = -1;
      }
    }
  }
  if ($sandbox['#finish'] === TRUE) {
    return 'the last procced node was ' . $sandbox['progress'];
  }
}