Question

我有一个小型数据库，其中包含我手动添加的地方，我正在尝试通过minDistance和maxDistance过滤它们。

所以这是mongoose架构

 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);
    });
};

这是我在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)

让我感到困惑的是，使用mongodb，我可以像这样进行查询，并且工作正常。

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

EDIT1：他的解决方案是他应该以米为单位指定maxDistance值，我无法看到这对我有什么帮助，因为我只是得到一个错误，无论我指定什么值为maxdistance。感谢

Answer 1

我发现解决方案，minDistance和maxDistance是字符串类型，对于maxDistance工作正常，但是对于minDistance，我需要将其转换为float或int。一个肮脏的解决方案就是这段代码：

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，如果minDistance是字符串类型，那么这只是必要的。感谢。

使用mongoDB和mongoose

1 个答案: