Saves field data for an existing entity.
\Drupal\Core\Entity\EntityInterface $entity: The entity with fields to save.
function field_attach_update(EntityInterface $entity) {
// Ensure we are working with a BC mode entity.
$entity = $entity
->getBCEntity();
_field_invoke('update', $entity);
// Let any module update field data before the storage engine, accumulating
// saved fields along the way.
$skip_fields = array();
foreach (module_implements('field_storage_pre_update') as $module) {
$function = $module . '_field_storage_pre_update';
$function($entity, $skip_fields);
}
// Collect the storage backends used by the remaining fields in the entities.
$storages = array();
foreach (field_info_instances($entity
->entityType(), $entity
->bundle()) as $instance) {
$field = field_info_field_by_id($instance['field_id']);
$field_id = $field['uuid'];
$field_name = $field['field_name'];
// Leave the field untouched if $entity comes with no $field_name property,
// but empty the field if it comes as a NULL value or an empty array.
// Function property_exists() is slower, so we catch the more frequent
// cases where it's an empty array with the faster isset().
if (isset($entity->{$field_name}) || property_exists($entity, $field_name)) {
// Collect the storage backend if the field has not been written yet.
if (!isset($skip_fields[$field_id])) {
$storages[$field['storage']['type']][$field_id] = $field_id;
}
}
}
// Field storage backends save any remaining unsaved fields.
foreach ($storages as $storage => $fields) {
$storage_info = field_info_storage_types($storage);
module_invoke($storage_info['module'], 'field_storage_write', $entity, FIELD_STORAGE_UPDATE, $fields);
}
// Let other modules act on updating the entity.
module_invoke_all('field_attach_update', $entity);
$entity_info = $entity
->entityInfo();
if ($entity_info['field_cache']) {
cache('field')
->delete('field:' . $entity
->entityType() . ':' . $entity
->id());
}
}