MongoDB使用$ near查找查询并且坐标不起作用

问题描述

我正在尝试使用mongodb中的某些地理位置功能.在$ near中使用查找查询似乎无效！

I'm trying to make use of some geolocation functionality in mongodb. Using a find query with $near doesn't seem to work!

我当前在数据库中有该对象:

I currently have this object in my database:

{
    "Username": "Deano",
    "_id": {
        "$oid": "533f0b722ad3a8d39b6213c3"
    },
    "location": {
        "type": "Point",
        "coordinates": [
            51.50998,
            -0.1337
        ]
    }
}

我还设置了以下索引:

{
  "v": 1,
  "key": {
    "location": "2dsphere"
  },
  "ns": "heroku_app23672911.catchmerequests",
  "name": "location_2dsphere",
  "background": true
}

当我运行此查询时:

db.collectionname.find({ "location" : { $near : [50.0 , -0.1330] , $maxDistance : 10000 }})

我收到此错误:

error: {
    "$err" : "can't parse query (2dsphere): { $near: [ 50.0, -0.133 ], $maxDistance: 10000.0 }",
    "code" : 16535
}

有人知道我要去哪里了吗?任何帮助将不胜感激！

Does anyone know where I'm going wrong? Any help would be much appreciated!

推荐答案

如果您的数据也采用GeoJSON格式，则似乎需要使用GeoJSON格式.如果您使用:

It seems you need to use the GeoJSON format if your data is in GeoJSON format too, as yours is. If you use:

db.collectionname.find({
    "location": {
        $near: {
            $geometry:
                { type: "Point", coordinates: [50.0, -0.1330] }, $maxDistance: 500
        }
    }
})

它应该工作.我可以使用该字段的GeoJSON存储格式来复制您的错误，但是该文档在查询表达式中称为旧点.我认为文档尚不清楚，因为它们建议您可以将GeoJSON和旧式坐标与2dsphere索引一起使用 2dsphere

it should work. I could replicate your error using GeoJSON storage format for the field, but what the docs call legacy points in the query expression. I think the docs are a bit unclear in that they suggest you can use both GeoJSON and legacy coordinates with a 2dsphere index 2dsphere

我正在使用2.4.10，因为它的价值是什么，因为2.4版本中的空间有一些大变化.

I am using 2.4.10, for what it is worth, as there were some big changes to spatial in the 2.4 release.

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