Question

I have objects like the following:

{
    "_id" : ObjectId("4f7f0d64e4b0db1e18790f10"),
    "location" : [
        0.674081,
        23.473
    ],
    "name" : "Item Name"
}

If I try and create a 2D index on the location field, I get an error:

> db.Place.ensureIndex({location:"2d"});
point not in interval of [ -180, 180 )

I’ve tried finding documents that are out of bounds but this returns no results:

> db.Place.find({"location.0":{"$lte":-180, "$gte":180}});
> db.Place.find({"location.1":{"$lte":-180, "$gte":180}});

I’ve also tried the following queries to make sure:

> db.Place.find({"location":{"$size":0}}).count();
0
> db.Place.find({"location":{"$size":1}}).count();
0
> db.Place.find({"location":{"$size":2}}).count();
363485
> db.Place.count();
363485

What other approaches can I use to find the bad document(s)?

For information I’m using MongoDB version 2.0.2 on 32 bit Linux (yes, I know that’s not good enough for prod). The documents were imported by a Java document where the location objects are only ever represented as double primitives.

Answer 1

Your queries aren’t quite right. You need:

db.Place.find({“location”: {“$lte”:-180 } })

And

db.Place.find({“location”: {“$gte”:180 } })