在猫鼬错误中，当我使用 groupby "message": { "ok": 0, "code": 40234, "codeName": "Location40234", "name": "MongoError" }

Question

{
        $group: ({
          id: '$_id',
          count: { $sum: '$qty' },
          name: { $first: '$brand' }
        })
      },
      {
        $project: {
          _id: '$_id',
          Qty: '$count',
          brand: '$name'
        }
}