public function up() { $db = \DB::getMongoDB(); Lrs::get()->each(function (Lrs $lrs) use($db) { if (isset($lrs->users)) { $lrs->users = Helpers::convertIds($lrs->users); } $lrs->owner_id = new \MongoId($lrs->owner_id); $lrs->save(); echo 'IDs for lrs collection "' . $lrs->title . '" converted to MongoIds.' . PHP_EOL; }); }