Devise\Models\Scaffolding\MigrationScaffolding::buildIndexes PHP Метод

    private function buildIndexes()
    {
        $replacementIndexes = "";
        $tab = '                ';
        foreach ($this->fields as $field) {
            if (isset($field['index'])) {
                $replacementIndexes .= $tab . '$table->' . $field['index'] . "('" . $field['name'] . "');";
            }
        }
        return $replacementIndexes;
    }