function field_attach_delete_revision

Delete field data for a single revision of an existing entity. The passed entity must have a revision id attribute.

Parameters

$entity_type: The type of $entity; e.g. 'node' or 'user'.

$entity: The entity with fields to save.

Related topics

File

core/modules/field/field.attach.inc, line 1036

Field attach API, allowing entities (nodes, users, ...) to be 'fieldable'.

Code

function field_attach_delete_revision($entity_type, $entity) {
  _field_invoke('delete_revision', $entity_type, $entity);

  list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);

  // Collect the storage backends used by the fields in the entities.
  $storages = array();
  foreach (field_info_instances($entity_type, $bundle) as $instance) {
    $field = field_info_field($instance['field_name']);
    $field_name = $field['field_name'];
    $storages[$field['storage']['type']][$field_name] = $field_name;
  }

  // Field storage backends delete their data.
  foreach ($storages as $storage => $fields) {
    $storage_info = field_info_storage_types($storage);
    module_invoke($storage_info['module'], 'field_storage_delete_revision', $entity_type, $entity, $fields);
  }

  // Let other modules act on deleting the revision.
  module_invoke_all('field_attach_delete_revision', $entity_type, $entity);
}