How can I find nearby place with latitude and longitude in mongodb?

Question

Am very new to mongodb and golang. I have a collection named \"myplace\" It has the following fileds place_name, city, latitude, longitude. My question is user in some place and

Answer 1

Hi For your case I think you should changed above doc as below

    {
    "_id" : ObjectId("545749dba2b0b4cf603a7546"),
    "city" : "B",
    "placeName" : "A",
    "loc" : {
        "lon" : 51.10682735591432,
        "lat" : -114.11773681640625
    }
}
{
    "_id" : ObjectId("545749f3a2b0b4cf603a7547"),
    "city" : "B1",
    "placeName" : "A1",
    "loc" : {
        "lon" : 51.09144802136697,
        "lat" : -114.11773681640625
    }
}

After that indexing the above documents as below

db.collectionName.ensureIndex({loc:"2d"})

If indexing executing properly then write following query to find out near by documents

db.location.find({loc: {$near:[51,-114]}})

for more help you should refer this mongo $near and $geoNear click here

and sorry for golang because I don't know more about golang

for golang

var places []Place
lat := 51.515614
long := -0.268998
err = coll.Find(bson.M{"loc": bson.M{"$near": []float64{long, lat}, "$maxDistance" :      0.056}}).All(&places)