What is the correct way to query this document? (If the index is correct) - mongodb

Question

I've a BigChainDB docker container running in my machine and I'm trying to store and retrieve geospatial data.
I've created through the MongoDB interface a 2dsphere index "location" in the "metadata" collection.
I've checked with the command:
db.people.getIndexes()
And I think that everything it's ok, in fact the result is this:
{
"v" : 2,
"key" : {
"loc" : "2dsphere"
},
"name" : "loc_2dsphere",
"ns" : "bigchain.metadata",
"2dsphereIndexVersion" : 3
}
The document that I've inserted to try some spatial queries is (this is the result of a db.metadata.findOne() query):
{
"_id" : ObjectId("5ccab10a2ce1b70022823a0f"),
"id" : "752ee9abccf83c7fd25d86c9a7d12229ae292fa27544f6881f1dbf97ccd8b413",
"metadata" : {
"location" : {
"type" : "Point",
"coordinates" : [
22.170872,
113.578749
]
}
}
}
But when I use this spatial query nothing is retrieved:
db.metadata.find(
{
"metadata": {
"location": {
$near: {
$geometry: {
type: "Point" ,
coordinates: [ 22 , 113 ]
},
}
}
}
})
I'm doing anything wrong, or is there the possibility that the index doesn't work?

Answer 1

There are a couple of issues here.
The first is that the index is on the field loc whereas your query is querying metadata.location.
If you try creating a 2dsphere index on metadata.location you will see the 2nd error:
"errmsg" : "invalid point in geo near query $geometry argument: { type: \"Point\", coordinates: [ 22.0, 113.0 ] } longitude/latitude is out of bounds, lng: 22 lat: 113",
This error shows that the GEOJSON point defined in your document is invalid, as the latitude value of 113 is outside the acceptable range of [-90, 90].
You would need to correct the data to be valid GEOJSON before indexing.