function hook_field_update

Define custom update behavior for this module's field data.

This hook is invoked from field_attach_update() on the module that defines a field, during the process of updating an entity object (node, taxonomy term, etc.). It is invoked just before the data for this field on the particular entity object is updated into field storage. Only field modules that are storing or tracking information outside the standard field storage mechanism need to implement this hook.

Parameters

$entity_type: The type of $entity.

$entity: The entity for the operation.

$field: The field structure for the operation.

$instance: The instance structure for $field on $entity's bundle.

$langcode: The language associated with $items.

$items: $entity->{$field['field_name']}[$langcode], or an empty array if unset.

See also

hook_field_insert()

hook_field_delete()

Related topics

File

core/modules/field/field.api.php, line 527

Hooks provided by the Field module.

Code

function hook_field_update($entity_type, $entity, $field, $instance, $langcode, &$items) {
  if (config_get('taxonomy.settings', 'maintain_index_table') && $field['storage']['type'] == 'field_sql_storage' && $entity_type == 'node') {
    $first_call = &backdrop_static(__FUNCTION__, array());

    // We don't maintain data for old revisions, so clear all previous values
    // from the table. Since this hook runs once per field, per object, make
    // sure we only wipe values once.
    if (!isset($first_call[$entity->nid])) {
      $first_call[$entity->nid] = FALSE;
      db_delete('taxonomy_index')->condition('nid', $entity->nid)->execute();
    }
    // Only save data to the table if the node is published.
    if ($entity->status) {
      $query = db_insert('taxonomy_index')->fields(array('nid', 'tid', 'sticky', 'created'));
      foreach ($items as $item) {
        $query->values(array(
          'nid' => $entity->nid,
          'tid' => $item['tid'],
          'sticky' => $entity->sticky,
          'created' => $entity->created,
        ));
      }
      $query->execute();
    }
  }
}