Laravel で MongoDB を使用した複雑なクエリについて

composer require jenssegers/mongodb

$cityId = 1;//城市ID
$count = UserModel::query()->raw(function ($collection) use ($cityId) {
    $aggregate = [];
    $aggregate[]['$match'] = [
        'city_id' => intval($city_id),//过滤城市
        'sex' => ['$in' => [1,2]],//过滤性别
    ];
    $aggregate[]['$group'] = [
        '_id' => '$sex',//更具性别进行分组
        'avg_age' => [
            '$avg' => '$age',//查询年龄平均值
        ]
    ];
    //这里还可以继续添加各种条件
    return $collection->aggregate($aggregate)->toArray();
});