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

modules/field/field.attach.inc, line 1082

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) {
        $field = field_info_field_by_id($instance['field_id']);
        $field_id = $field['id'];
        $storages[$field['storage']['type']][$field_id] = $field_id;
    }
    // Field storage backends delete their data.
    foreach ($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);
}