Mongoose/MongoDb获取错误geoNear不是一个函数

Question

这是我的控制器文件locations.js

var mongoose = require('mongoose');
var Loc = mongoose.model('location');

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: 1000
  };

  Loc.geoNear(point, geoOptions, function (err, results, stats) {
    console.log(results);
  });
};

我的模型文件locations.js

var mongoose = require('mongoose');

var reviewSchema = new mongoose.Schema({
    author: String,
    rating: {
        type: Number,
        required: true,
        min: 0,
        max: 5
    },
    reviewText: String,
    createdOn: {
        type: Date,
        "default": Date.now
    }
});

var openingTimeSchema = new mongoose.Schema({
    days: {
        type: String,
        required: true
    },
    opening: String,
    closing: String,
    closed: {
        type: Boolean,
        required: true
    }
});

var locationSchema = new mongoose.Schema({
    name: {
        type: String,
        required: true
    },
    address: String,
    rating: {
        type: Number,
        "default": 0,
        min: 0,
        max: 5
    },
    facilities: [String],
    // Always store coordinates longitude, latitude order.
    coords: {
        type: [Number],
        index: '2dsphere'
    },
    openingTimes: [openingTimeSchema],
    reviews: [reviewSchema]
});

mongoose.model('location', locationSchema, 'locations');

每当我运行http:// localhost:3000/api/locations？lng = -0.9690884&lat = 51.455041我得到错误geoNear不是函数

TypeError:Loc.geoNear不是Layer.handle上的module.exports.locationsListByDistance(/home/shackers/Projects/mean/loc8r/app_api/controllers/locations.js:51:7)的函数[as handle_request](/ home /shackers/Projects/mean/loc8r/node_modules/express/lib/router/layer.js:95:5)下一步(/home/shackers/Projects/mean/loc8r/node_modules/express/lib/router/route.js :137:13)在Route.dispatch(/home/shackers/Projects/mean/loc8r/node_modules/express/lib/router/route.js:112:3)在Layer.handle [as handle_request](/ home/shackers) /Projects/mean/loc8r/node_modules/express/lib/router/layer.js:95:5)/home/shackers/Projects/mean/loc8r/node_modules/express/lib/router/index.js:281:22在Function.process_params(/home/shackers/Projects/mean/loc8r/node_modules/express/lib/router/index.js:335:12)下一步(/ home/shackers/Projects/mean/loc8r/node_modules/express/lib/router/index.js:275:10)在路由器(/ hom)的Function.handle(/home/shackers/Projects/mean/loc8r/node_modules/express/lib/router/index.js:174:3)e/shackers/Projects/mean/loc8r/node_modules/express/lib/router/index.js:47:12)在Layer.handle [as handle_request](/ home/shackers/Projects/mean/loc8r/node_modules/express/lib/router/layer.js:95:5)在/ home/shackers/Projects /的trim_prefix(/home/shackers/Projects/mean/loc8r/node_modules/express/lib/router/index.js:317:13)函数.process_params中的/ mean/loc8r/node_modules/express/lib/router/index.js:284:7(/home/shackers/Projects/mean/loc8r/node_modules/express/lib/router/index.js:335:12 )at/home/shackers/Projects/mean/loc8r/node_modules/express/lib/router下一个(/home/shackers/Projects/mean/loc8r/node_modules/express/lib/router/index.js:275:10) /index.js:635:15

这是我正在使用的依赖项的版本:

• 节点:8.9.3 npm:5.5.1 express:4.15.5 mongoose:5.0.0 mongoDb:3.6.1

Answer 1

router.get('/', () => {
    Loc.aggregate([
        {
            $geoNear: {
                near: 'Point',
                distanceField: "dist.calculated",
                maxDistance: 100000,
                spherical: true                
            }
        }
    ]).then(function(err, results, next){
        res.send();
    }).catch(next);
});?

参考: - https://docs.mongodb.com/manual/reference/command/geoNear/

Answer 2

发生此错误是因为.geoNear曾经受支持，但是从Mongoose 5开始不再受支持，后者使用Node MongoDB v3驱动程序。

该问题记录在“ 迁移到Mongoose 5”文档中，该文档又链接到MongoDB 3驱动器发行说明，该发行说明提供了有关建议的替代产品的声明：

geoNear命令的功能在该语言的其他地方，在未分片集合上的$ near / $ nearSphere查询运算符中以及在所有集合上的$ geoNear聚合阶段中都是重复的。

有效地，官方文档支持$geoNear其他答案中所记载的使用方式。

Answer 3

我遇到了完全相同的问题，并且我已经放弃了之前使用的方法（看起来您也遇到了）。以下是不会引发错误的替代方案，并且应该给出与使用 Loc.geoNear 后相同的结果：

Loc.aggregate(
        [
            {
                '$geoNear': {
                    'near': point,
                    'spherical': true,
                    'distanceField': 'dist',
                    'maxDistance': 1000
                }
            }
        ],
        function(err, results) {
            // do what you want with the results here
        }
    )