function hook_field_storage_pre_update

Act before the storage backends update field data.

This hook allows modules to store data before the Field Storage API, optionally preventing the field storage module from doing so.


$entity_type: The type of $entity; for example, 'node' or 'user'.

$entity: The entity with fields to save.

$skip_fields: An array keyed by field IDs whose data has already been written and therefore should not be written again. The values associated with these keys are not specified.

Return value

Saved field IDs are set set as keys in $skip_fields.

Related topics

1 function implements hook_field_storage_pre_update()

Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.

forum_field_storage_pre_update in drupal/modules/forum/forum.module
Implements hook_field_storage_pre_update().
1 invocation of hook_field_storage_pre_update()
field_attach_update in drupal/modules/field/
Save field data for an existing entity.


drupal/modules/field/field.api.php, line 2268
Hooks provided by the Field module.


function hook_field_storage_pre_update($entity_type, $entity, &$skip_fields) {
  $first_call =& drupal_static(__FUNCTION__, array());
  if ($entity_type == 'node' && $entity->status && _forum_node_check_node_type($entity)) {

    // We don't maintain data for old revisions, so clear all previous values
    // from the table. Since this hook runs once per field, per entity, make
    // sure we only wipe values once.
    if (!isset($first_call[$entity->nid])) {
      $first_call[$entity->nid] = FALSE;
        ->condition('nid', $entity->nid)

    // Only save data to the table if the node is published.
    if ($entity->status) {
      $query = db_insert('forum_index')
      foreach ($entity->taxonomy_forums as $language) {
        foreach ($language as $delta) {
            'nid' => $entity->nid,
            'title' => $entity->title,
            'tid' => $delta['value'],
            'sticky' => $entity->sticky,
            'created' => $entity->created,
            'comment_count' => 0,
            'last_comment_timestamp' => $entity->created,

      // The logic for determining last_comment_count is fairly complex, so
      // call _forum_update_forum_index() too.