node.js - Mongodb $geoNear operator not working correctly -


i'm building nodejs api using mongodb database android app. when android user sends gps position end, api sorts data distance user , replies back.

for this, i'm using $geonear stage in aggregation framework. followed instructions, can't data, "undefined".

here json data format db.

{    userid: "",    description: "",    location: {         type: "point",         coordinates: [ latitude, longitude ]    },    image: "" }

and here geonear code.

db.posts.createindex({location:"2dsphere"}); db.posts.aggregate([     {         $geonear: {             near: { type: "point", coordinates: [ parsefloat(geoinfo.latitude) , parsefloat(geoinfo.longitude) ] },             distancefield: "distance",             spherical: true         }     },     { $sort: { distance: 1 } },     { $limit: 20 } ], function(err, docs) {     if (err) {         callback(err, null);     }     callback(null, docs); });

i can see undefined result. i'm stuck in issue few days. helps appreciated!

here working code.

db.open(function(err, db) { var collection = db.collection("posts");  console.log(collection.listindexes);  // wait second before finishing up, ensure have written item disk settimeout(function() {     collection.aggregate([ {         $geonear : {             near : {                 type : "point",                 coordinates : [ parsefloat(-73.97), parsefloat(40.77) ]             },             distancefield : "distance",             spherical : true         }     }, {         $sort : {             distance : 1         }     }, {         $limit : 20     } ], function(err, docs) {         if (err) {             console.log(err);         }         console.log("completed...........");         console.log("doc ====>" + json.stringify(docs));     }); }, 1000); });

inserts , create index commands:-

db.posts.insert( {   userid : "user1",   description : "desc 1",   loc : { type: "point", coordinates: [ -73.97, 40.77 ] },   name: "central park",   category : "parks",   image : "image 1" } )  db.posts.insert( {   userid : "user2",   description : "desc 2",   loc : { type: "point", coordinates: [ -73.88, 40.78 ] },   name: "la guardia airport",   category : "airport",   image : "image 2" } )  db.posts.createindex( { loc : "2dsphere" } )

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