Laravel Mongodb 聚合匹配不起作用

Question

我正在尝试让用户在 laravel 中使用 mongodb 发布帖子，此查询在 mongodb shell 中运行良好，但在 laravel 中无法正常运行，并且出现此错误：

一个流水线阶段规范对象必须只包含一个字段。

这是我在 mongodb shell 中的查询：

db.instaPosts.aggregate([ 
 {"$match" :{ "userid" : "1507073550"}}, 

{"$group" : 
{ "_id" : "$post.location.id", 
"location" : {"$first":"$post.location.name"},

"count":{ "$sum" : 1}}} 
])

结果如下：

{ "_id" : null, "location" : null, "count" : 7 }
{ "_id" : "332558707", "location" : "Daryache Chitgar,Tehran,Iran", "count" : 1 }
{ "_id" : "250445386", "location" : "دانشگاه علم و فرهنگ", "count" : 1 }
{ "_id" : "1343757649052341", "location" : "Agor Caffe", "count" : 1 }
{ "_id" : "111106416225578", "location" : "Santiago Bernabeu, Madrid", "count" : 1 }
{ "_id" : "506047058", "location" : "Cardiff City Stadium", "count" : 1 }

这是我的控制器：

        $places = Posts::raw(function ($collection){
            return $collection->aggregate([
               [
                   '$match' => [
                           'userid' => [ '$eq' => '1507073550']
                   ],
                    '$group'=> [
                        '_id' => '$post.location.id',
                        'location' => [
                            '$first'=>'$post.location.name'
                        ],
                        'total' => [
                            '$sum' => 1
                        ],
                    ]
               ]
            ]);
        });

完全相同的东西！但它不起作用。

Answer 1

终于找到解决办法了！

        $places = Posts::raw(function ($collection){
            return $collection->aggregate([
               [
                   [
                   '$match' => [
                           'userid' => [ '$eq' => '1507073550']
                      ],
                   ],
                   [
                    '$group'=> [
                        '_id' => '$post.location.id',
                        'location' => [
                            '$first'=>'$post.location.name'
                        ],
                        'total' => [
                            '$sum' => 1
                        ],
                      ]
                   ]
               ]
            ]);
        });

我应该用 [] 包装 $match 和 $group，