$near 错误 - 规划器返回错误:无法找到 $geoNear 查询的索引

Posted

技术标签:

【中文标题】$near 错误 - 规划器返回错误:无法找到 $geoNear 查询的索引【英文标题】:$near error - planner returned error: unable to find index for $geoNear query 【发布时间】:2018-09-11 12:57:18 【问题描述】:

我在这方面遇到了很大的麻烦。我正在构建一个小 API 来获取给定特定坐标的最接近的存储元素(在 mlab MongoDB 中)。

我想使用 $near 等 Mongo 自定义查询工具从我的数据库中获取最接近的元素。

您可以找到原始仓库here!

数据

原始数据是我转换成geojson格式的一个小.csv。

这是该 .csv 的简短版本:

这是它的geojson版本:


  "type": "FeatureCollection",
  "features": [
    
      "type": "Feature",
      "geometry": 
        "type": "Point",
        "coordinates": [2.4049238868200975, 48.82094216189432]
      ,
      "properties": 
        "event_type": "imp"
      
    ,
    
      "type": "Feature",
      "geometry": 
        "type": "Point",
        "coordinates": [2.3645320381923534, 48.816341825787724]
      ,
      "properties": 
        "event_type": "imp"
      
    ,
    
      "type": "Feature",
      "geometry": 
        "type": "Point",
        "coordinates": [2.3274838513968072, 48.86982967859056]
      ,
      "properties": 
        "event_type": "imp"
      
    ,
    
      "type": "Feature",
      "geometry": 
        "type": "Point",
        "coordinates": [2.23284629237154, 48.89111120713999]
      ,
      "properties": 
        "event_type": "imp"
      
    ,
    
      "type": "Feature",
      "geometry": 
        "type": "Point",
        "coordinates": [2.23284629237154, 48.89111120713999]
      ,
      "properties": 
        "event_type": "click"
      
    ,
    
      "type": "Feature",
      "geometry": 
        "type": "Point",
        "coordinates": [2.4204737962258305, 48.85038737901075]
      ,
      "properties": 
        "event_type": "imp"
      
    ,
    
      "type": "Feature",
      "geometry": 
        "type": "Point",
        "coordinates": [2.4214870126092594, 48.86339618816508]
      ,
      "properties": 
        "event_type": "imp"
      
    ,
    
      "type": "Feature",
      "geometry": 
        "type": "Point",
        "coordinates": [2.4144620076022436, 48.876530301936576]
      ,
      "properties": 
        "event_type": "imp"
      
    ,
    
      "type": "Feature",
      "geometry": 
        "type": "Point",
        "coordinates": [2.2470618097659285, 48.88845096504584]
      ,
      "properties": 
        "event_type": "imp"
      
    
  ]


模型

这是使用 mongoose 的架构(如您所见,我确实添加了 2dsphere 索引):

const mongoose = require("mongoose");

const FeatureSchema = new mongoose.Schema(
  type: String,
  geometry: 
    type:  type: String, default: "Point" ,
    coordinates:  type: [Number] 
  ,
  properties:  event_type: String 
);

FeatureSchema.index( geometry: "2dsphere" );
const MapEventSchema = new mongoose.Schema(
  type: String,
  features: [FeatureSchema]
);

const MapEvent = mongoose.model("mapEvent", MapEventSchema);

module.exports = MapEvent;

测试

现在这是我正在努力进行的测试(使用 Mocha):

const assert = require("assert");
const MapEvent = require("../src/models/mapEvents");
const fs = require("fs");

describe("Read test", () => 
  // create new room collection because collection is drop between each file
  beforeEach(done => 
    rawJSON = fs.readFileSync("./src/assets/test_assets/read_test.json");
    const parsedContent = JSON.parse(rawJSON);
    const mapEvent = new MapEvent(parsedContent);
    mapEvent
      .save()
      .then(() => 
        done();
      )
      .catch(error => 
        console.error(error);
      );
  );

  it("Find nearest event by coordonates", done => 
    const distance = 1000;
    const lat = 48.86;
    const lon = 2.35;

    function waitForIndex() 
      return new Promise((resolve, reject) => 
        MapEvent.on("index", error => (error ? reject(error) : resolve()));
      );
    

    MapEvent.findOne(
      geometry: 
        $near: [lat, lon],
        $maxDistance: distance
      
    )
      //.then(waitForIndex)
      .then(MapEvent.init())
      .then(nearestResult => 
        console.log("------------");
        console.log(nearestResult);
        console.log("------E-----");
        assert(nearestResult);
        done();
      )
      .catch(error => 
        console.error("************");
        console.error(error);
        console.error("******E*****");
      );
  );
); 

输出

您可能会注意到,我注释掉了 waitForIndex()(在相关的 *** 问题上找到)改为使用 MapEvent.init()(在 github 上找到)。不幸的是,两种解决方案都给了我相同的错误输出。

Connection is established
  Create test
(node:12483) DeprecationWarning: collection.ensureIndex is deprecated. Use createIndexes instead.
    ✓ MapEvent saving

  Read test
************
 MongoError: error processing query: ns=babylon_ad_db.mapevents batchSize=1 limit=1Tree: GEONEAR  field=geometry maxdist=1000 isNearSphere=0
Sort: 
Proj: 
 planner returned error: unable to find index for $geoNear query
    at queryCallback (/home/geoffrey/babylon-ad/node_modules/mongodb-core/lib/cursor.js:248:25)
    at /home/geoffrey/babylon-ad/node_modules/mongodb-core/lib/connection/pool.js:532:18
    at process._tickCallback (internal/process/next_tick.js:61:11)
  ok: 0,
  errmsg:
   'error processing query: ns=babylon_ad_db.mapevents batchSize=1 limit=1Tree: GEONEAR  field=geometry maxdist=1000 isNearSphere=0\nSort: \nProj: \n planner returned error: unable to find index for $geoNear query',
  code: 2,
  codeName: 'BadValue',
  operationTime:
   Timestamp  _bsontype: 'Timestamp', low_: 7, high_: 1536667477 ,
  '$clusterTime':
    clusterTime:
      Timestamp  _bsontype: 'Timestamp', low_: 7, high_: 1536667477 ,
     signature:  hash: [Binary], keyId: [Long]  ,
  name: 'MongoError',
  [Symbol(mongoErrorContextSymbol)]:  
******E*****
    1) Find nearest event by coordonates


  1 passing (3s)
  1 failing

  1) Read test
       Find nearest event by coordonates:
     Error: Timeout of 2000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/home/geoffrey/babylon-ad/test/read_test.js)

我已经做了一些谷歌搜索,这就是我听说 $near 和 2dsphere 索引的方式。但是,我仍然无法弄清楚为什么它说它找不到索引。即使我使用 waitForIndex() 或 MapEvent.init() 等待它。

这个社区创造了一些很酷的奇迹,希望你能帮助我。

谢谢,

【问题讨论】:

没人知道吗? 【参考方案1】:

此类错误表示未创建索引。这通常是由于坐标数据无效。也许加载你的 mongo shell 并确保你的索引存在:

mongo
use yourdatabasename
db.yourcollection.getIndexes()

你应该得到类似的结果:


    "v" : 2,
    "key" : 
      "geometry" : "2dsphere"
    ,
    "name" : "geometry_2dsphere",
    "ns" : "databasename.yourcollection",
    "2dsphereIndexVersion" : 3
  

如果不存在,请尝试在 shell 中创建索引 - 如果无法创建索引,则会引发错误。:

db.yourcollection.createIndex(  geometry : "2dsphere"  )

【讨论】:

可能是创建了索引,但使用了错误的说明符,例如在我的例子中,我为coordinates 创建了一个2dsphere 索引而不是location,它适用于某些查询,但不适用于$geoNear 是的@hlongmore 那是我的错误。我做了db.restaurants.ensureIndex(zipcode:"2dsphere"),而我应该做db.restaurants.ensureIndex(location:"2dsphere"),后者解决了我的问题!

以上是关于$near 错误 - 规划器返回错误:无法找到 $geoNear 查询的索引的主要内容,如果未能解决你的问题,请参考以下文章

ebaySOAP 示例示例给出错误 - 无法找到包装器“https”

Gradle(包装器)+ STS + Spring Boot:错误:无法找到或加载主类 1.1,

centos7系统出现“-bash:syntax error near unexpected token `('”错误的解决方法

NestJS + Angular 项目抛出未找到模块:错误:无法解析“缓存管理器”

EXCEL VBA中规划求解器Solver出现 运行错误‘1004’应用程序定义或对象定义错误

NEAR 智能合约错误:“合约未初始化”