我有一个小型数据库,其中包含我手动添加的位置,并且我试图通过minDistance和maxDistance对其进行过滤。

这就是猫鼬模式

 var schema = new Schema({
    name: {
        type: String,
        unique: false,
        required: true
    },
    location: {
        type: [Number],  // [<longitude>, <latitude>]
        index: '2dsphere',     // create the geospatial index
        required: false // true senare
    }
});


这是用于获取附近地点的方法:

schema.statics.getNearby = function (longitude, latitude, minDistance, maxDistance, callback) {

    if ((longitude || latitude) === undefined) return new ModelError("location or radius is missing");

    var Places = this;
    var point = { type: "Point", coordinates: [ longitude, latitude]};
    Places.geoNear(point, { minDistance: minDistance, maxDistance : maxDistance},
        function(err, activities, stats) {
            if (err)  return callback(err);
            callback(null, activities);
    });
};


这是执行此方法时得到的错误代码:

  500 Error
   at Error.MongoError (/home/ec2-user/bored_server/node_modules/mongoose/node_modules/mongodb/node_modules/mongodb-core/lib/error.js:13:17)
   at Function.MongoError.create (/home/ec2-user/bored_server/node_modules/mongoose/node_modules/mongodb/node_modules/mongodb-core/lib/error.js:31:11)
   at /home/ec2-user/bored_server/node_modules/mongoose/node_modules/mongodb/node_modules/mongodb-core/lib/topologies/server.js:768:66
   at Callbacks.emit (/home/ec2-user/bored_server/node_modules/mongoose/node_modules/mongodb/node_modules/mongodb-core/lib/topologies/server.js:84:3)
   at null.messageHandler (/home/ec2-user/bored_server/node_modules/mongoose/node_modules/mongodb/node_modules/mongodb-core/lib/topologies/server.js:218:23)
   at Socket.<anonymous> (/home/ec2-user/bored_server/node_modules/mongoose/node_modules/mongodb/node_modules/mongodb-core/lib/connection/connection.js:259:22)
   at Socket.emit (events.js:95:17)
   at Socket.<anonymous> (_stream_readable.js:765:14)
   at Socket.emit (events.js:92:17)
   at emitReadable_ (_stream_readable.js:427:10)


让我感到困扰的是,使用mongodb可以执行这样的查询,并且效果很好。

db.places.find({
    location: {
        $nearSphere : {
            $geometry: {
                type: "Point",
                coordinates: [ 18, 58] },
                $minDistance: 0,
                $maxDistance: 1000000
                }
            }
        }
    )


编辑1:
他的解决方案是他应该以米为单位指定maxDistance值,我看不到这对我有什么帮助,因为无论我将哪个值指定为maxdistance,都会出现错误。谢谢

最佳答案

我发现解决方案minDistance和maxDistance是字符串类型,对于maxDistance可以正常工作,但是对于minDistance,我不得不将其转换为float或int。
肮脏的解决方案将是此代码:

schema.statics.getNearby = function (longitude, latitude, minDistance, maxDistance, callback) {

if ((longitude || latitude) === undefined) return new ModelError("location or radius is missing");

var Places = this;
var point = { type: "Point", coordinates: [ longitude, latitude]};
Places.geoNear(point, { minDistance: parseFloat(minDistance), maxDistance : maxDistance},
    function(err, activities, stats) {
        if (err)  return callback(err);
        callback(null, activities);
});


};

现在,仅当minDistance为字符串类型时才需要这样做。
谢谢。

09-18 20:11