当使用geoNear通过URL传递索引时，MongoError不报告任何索引 [英] MongoError reports no indices when passed indices through URL using geoNear

问题描述

我正在尝试创建一个页面，该页面按距我的距离列出数据库中的位置.当我通过URL传递一组坐标时，出现此错误:

Im trying to create a page that lists locations on a database by their distance from me. When I pass in a set of coordinates via the URL I get this error:

{
  "name": "MongoError",
  "message": "no geo indices for geoNear",
  "waitedMS": 0,
  "ok": 0,
  "errmsg": "no geo indices for geoNear"
}

通过输入: http://localhost:3000/api/地点?lng = -133.482946& lat = 45.263776

我的代码如下:

module.exports.locationsListByDistance = function (req, res) {
    var lng = parseFloat(req.query.lng);
    var lat = parseFloat(req.query.lat);
    var point = {
        type: "Point",
        coordinates: [lng, lat]
    };
    var geoOptions = {
        spherical: true,
        maxDistance: 20000,
        num: 10
    };
    if (!lng || !lat) {
        sendJsonResponse(res, 404, {
        "message": "lng and lat query parameters are required"
        });
        return;
    }
    Loc.geoNear(point, geoOptions, function(err, results, stats){
        var locations= [];
        if (err) {
            sendJsonResponse(res, 404, err);
        } else {
            results.forEach(function(doc) {
                locations.push({
                    distance: doc.dis,
                    name: doc.obj.name,
                    address: doc.obj.address,
                    rating: doc.obj.rating,
                    facilities: doc.obj.facilities,
                    _id: doc.obj._id
                });
            });
            sendJsonResponse(res, 200, locations);
        }
    });
};

每次都会触发if语句错误，并显示上面列出的错误. 如果我控制台记录该点对象，则它会在其范围内正确显示.

It triggers the if statement error every time and the error listed above is displayed. If I console log the point object it comes up correctly within its scope.

有人对此错误有任何经验吗?有什么建议? 几个小时的搜索工作提出了可能的mongo客户端修复程序，但是由于我没有直接使用mongo客户端，因此无法作为解决方案.

Does anyone have any experience with this error? Any suggestions? Several hours of googling has come up with possible mongo client fixes but since I am not using mongo client directly it would not work as a solution.

推荐答案

关于确保您拥有地理空间索引的评论是正确的.试试这个...

The comment about ensuring you have a geospatial index is right. Try this...

db.locations.ensureIndex({coords: '2dsphere'})

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