Can't extract geo keys' even though the GeoJSON is valid

Question

I have a collection in MongoDB with a 2dsphere index. The object I want to save looks like this:

{
        "type" : "Polygon",
        "coordinates" : [ 
            [ 
                [ 
                    5.052617929724351, 
                    52.64653192570052
                ], 
                [ 
                    5.051738165167465, 
                    52.64765805672784
                ], 
                [ 
                    5.054162882116928, 
                    52.64831549553909
                ], 
                [ 
                    5.054592035559312, 
                    52.64780777138566
                ], 
                [ 
                    5.055364511755601, 
                    52.64790541110375
                ], 
                [ 
                    5.056094072607651, 
                    52.64688343792051
                ], 
                [ 
                    5.054237983969346, 
                    52.64661654927096
                ], 
                [ 
                    5.052617929724351, 
                    52.64653192570052
                ]
            ]
        ]
    }

According to http://geojsonlint.com/ this is perfectly valid GeoJSON. However MongoDB says it can't extract the geo keys because the GeoJSON might be malformed.

Can anyone help me out and spot the mistake?

This is the MongoDB error I get:

insertDocument :: caused by :: 16755 Can't extract geo keys from object, malformed geometry?

Answer 1

The problem is that you are not providing the name of the top level object that the GeoJSON would be assigned to.

You must have created the "2dsphere" index on the "coordinates" field. Instead you want to create it on the field that this entire GeoJSON value will be assigned to.

db.geo.createIndex({"location":"2dsphere"})
db.geo.insert({"location" : {
     "type" : "Polygon",
     "coordinates" : [
        [ <list of your-coord-pairs> ]
     ]
 }})
WriteResult({ "nInserted" : 1 })