Let's have a 'places' collection with a geospatial indexed field named 'coordinates'. I need to get all the documents that have some coordinates filled in. So I try to do this:

> db.places.find({"coordinates": {"$ne": null}})
error: {
"$err" : "geo field only has 1 element :: caused by :: $ne: null",
"code" : 13068
}

Ok, let's check for 'exists' (though that's not what I really need).

> db.places.find({"coordinates": {"$exists": true}})

But if we add something to the query:

db.places.find({"deleted_at": null, "coordinates": {"$exists": true}})
error: {
"$err" : "geo field only has 1 element :: caused by :: $exists: true",
"code" : 13068
}

So what's the proper way to get all documents that have a not null geospatial field?