如何在命令geoNear中通过查询自定义字段？

Question

我有一个geoNear命令：

{
"geoNear": "user",
"near": [
  104.4859511,
  10.3804459
],
"spherical": true,
"distanceMultiplier": 6371000,
"minDistance": 0.038378767752844,
"maxDistance": 0.47088369172814,
"num": 6

}

我检索mongo DB，返回一​​些数据：

"results": [
     {
       "dis": 244511.13644192,
       "obj": {
         "_id": ObjectId("540af074e4b06192b9481436"),
         "user_id": NumberInt(219372),
         "full_name": "Guest_219372",
         "avatar": "",
         "birthday": ISODate("2002-01-05T17:00:00.0Z"),
         "sex": NumberInt(0),
         "feeling": "",
         "voice_intro": "",
         "location": [
           106.684767,
           10.785003 
        ],
         "last_update": NumberInt(0),
         "last_update_location": NumberInt(1410002680) 
      } 
    } 
]

我想在mongo官方网站的帮助下使用“查询”仅限几个字段限制数据，但它不会返回数据。我无法在命令geoNear中检查查询的对与错。我试图聚合，发现它支持$ project，geoNear更简单。我正在使用minDistance想要你的客户端，不支持聚合minDistance，迫使我采取命令geoNear。

{
    "geoNear": "user",
    "near": [
      104.4859511,
      10.3804459
    ],
    "spherical": true,
    "distanceMultiplier": 6371000,
    "minDistance": 0.038378767752844,
    "maxDistance": 0.47088369172814,
    "num": 6,   
    "query": {
        "find": { 
            "user_id": true,
            "_id": false
            ...
        }
    }
}