Drupal: Reset field_config type and module to field_set_storage after using mongo_db_migrate

drupal7-reset-field-config.php

/**
*
* When trying mongo_field_storage, and want to go back to old settings use this:
*
**/
function custom_field_config() {
  $res = db_query("SELECT * FROM {field_config}");

  $data = $res->fetchAll();
  
  foreach ($data as $key => $val) {

        $config = unserialize($val->data);
        if ($config['storage_type'] != 'field_sql_storage') {
          $config['storage']['type'] = 'field_sql_storage';
          $config['storage_type'] = 'field_sql_storage';
          $config['storage']['module'] = 'field_sql_storage';
          $config['storage_module'] = 'field_sql_storage';
          unset($config['storage']['mongodb_migrate']);
          $config_new = serialize($config);
        
          db_update('field_config')->fields(array(
                'data' => $config_new,
          ))
          ->condition('id', $val->id)
          ->execute();
        }
        
  }

  return;
}