LMongo\Query\Builder::prepareColumns PHP Méthode

    private function prepareColumns()
    {
        $columns = array();
        foreach ($this->columns as $column) {
            $columns[$column] = 1;
        }
        if (count($columns) and !isset($columns['_id'])) {
            $columns['_id'] = false;
        }
        return $columns;
    }