protected function generateMigrationMessage()
    {
        $tables = Collection::make(Config::get('laratrust.tables'))
            ->reject(function ($value, $key) {
                return $key == 'teams' && !Config::get('laratrust.use_teams');
            })
            ->sort();

        return "A migration that creates {$tables->implode(', ')} "
            . "tables will be created in database/migrations directory";
    }