public function fields() {
$fields = [
'item_id' => $this
->t('The field_collection_item id'),
'revision_id' => $this
->t('The field_collection_item revision id'),
'bundle' => $this
->t('The field_collection bundle'),
'field_name' => $this
->t('The field_collection field_name'),
'parent_type' => $this
->t('The type of the parent entity'),
'parent_id' => $this
->t('The identifier of the parent entity'),
];
return $fields;
}