$geoWithin $center with pymongo aggregation throws error

Question

This is my aggregation:

query = [
    {'$match' : { 'location' : { 
        '$geoWithin': {'$center' : [ [lng,lat], distance ] }} }}
]
dumps(DB.venue.aggregate(query))

However it throws:

OperationFailure: command SON([('aggregate', u'venue'), ('pipeline', 
[{'$match': {'location': {'$geoWithin': {'$center': [[u'23.729310', u'37.983716'], 
0.0023544184586407157]}}}}])]) failed: exception: Malformed geo query: { $geoWithin: 
{ $center: [ [ "23.729310", "37.983716" ], 0.002354418458640716 ] } }

I have also tried with $within instead of $geoWithin and $centerSphere instead of $center but no. Typically the find() query works with within and center (docs).

Is it a bug or just not supported by pymongo? Because the java driver work fine with $geoWithin and $centerSphere.

Answer 1

First things first, the correct query is:

{'$match' : {'location' : {'$geoWithin': {'$centerSphere': [[lng,lat], distance] }} }},

however the lng and lat above that I was passing were not floats but unicode chars so that threw the error.