小编tyr*_*yro的帖子

我在尝试根据分数和尝试对文档进行排名时遇到问题

"$rank must be specified with a top level sortBy expression with exactly one element" 

查询是：

$resultListing = UserScore::raw(function ($collection){
    return $collection->aggregate([
        ['$setWindowFields' => [
            'sortBy' => [ 'score'=>-1, 'attempts'=>1],
            'output' => [ 'scoreRank' => ['$rank'=>(object) [] ] ],
        ]]
    ]);
});

给出的语法是：

{
  $setWindowFields: {
  partitionBy: <expression>,
  sortBy: {
     <sort field 1>: <sort order>,
     <sort field 2>: <sort order>,
     ...,
     <sort field n>: <sort order>
  },

是否可以根据多个字段对文档进行排名？

I have the master database with login table and corresponding database settings for each user. On login I should dynamically change the db settings fetching from the table. I can change the db connection but this is not persisting.

Config::set("database.connections.mysql", [
'driver' => 'mysql',
"host" => $usr_host,
"database" => $usr_database,
"username" => $usr_username,
"password" => $usr_password,
...
]);

edit: New database is created for each user when he/she registers with the app and thus i dont have the database connection …

如何在MySQL表中首次使用ALTER查询将列位置更改为？