function node_access_rebuild

Rebuilds the node access database.

This rebuild is occasionally needed by modules that make system-wide changes to access levels. When the rebuild is required by an admin-triggered action (e.g module settings form), calling node_access_needs_rebuild(TRUE) instead of node_access_rebuild() lets the user perform his changes and actually rebuild only once he is done.

Note : As of Drupal 6, node access modules are not required to (and actually should not) call node_access_rebuild() in hook_enable/disable anymore.

Parameters

$batch_mode: (optional) Set to TRUE to process in 'batch' mode, spawning processing over several HTTP requests (thus avoiding the risk of PHP timeout if the site has a large number of nodes). hook_update_N() and any form submit handler are safe contexts to use the 'batch mode'. Less decidable cases (such as calls from hook_user(), hook_taxonomy(), etc.) might consider using the non-batch mode. Defaults to FALSE.

See also

node_access_needs_rebuild()

Related topics

File

drupal/core/modules/node/node.module, line 3237

The core module that allows content to be submitted to the site.

Code

function node_access_rebuild($batch_mode = FALSE) {
  db_delete('node_access')
    ->execute();

  // Only recalculate if the site is using a node_access module.
  if (count(module_implements('node_grants'))) {
    if ($batch_mode) {
      $batch = array(
        'title' => t('Rebuilding content access permissions'),
        'operations' => array(
          array(
            '_node_access_rebuild_batch_operation',
            array(),
          ),
        ),
        'finished' => '_node_access_rebuild_batch_finished',
      );
      batch_set($batch);
    }
    else {

      // Try to allocate enough time to rebuild node grants
      drupal_set_time_limit(240);

      // Rebuild newest nodes first so that recent content becomes available quickly.
      $nids = db_query("SELECT nid FROM {node} ORDER BY nid DESC")
        ->fetchCol();
      foreach ($nids as $nid) {
        $node = node_load($nid, TRUE);

        // To preserve database integrity, only acquire grants if the node
        // loads successfully.
        if (!empty($node)) {
          node_access_acquire_grants($node);
        }
      }
    }
  }
  else {

    // Not using any node_access modules. Add the default grant.
    db_insert('node_access')
      ->fields(array(
      'nid' => 0,
      'realm' => 'all',
      'gid' => 0,
      'grant_view' => 1,
      'grant_update' => 0,
      'grant_delete' => 0,
    ))
      ->execute();
  }
  if (!isset($batch)) {
    drupal_set_message(t('Content permissions have been rebuilt.'));
    node_access_needs_rebuild(FALSE);
    cache_invalidate_tags(array(
      'content' => TRUE,
    ));
  }
}