Error 16755 - Mongo can't extract geo keys

Question

I'm a beginnen with mongo and node.js, and in a existing project we have a collection with shops with geolocs. I get the following error (I have removed some fields)

"code" : 16755,
"errmsg" : "Can't extract geo keys: { _id: ObjectId('566990eea9c7a38740a305a3'), 
id: 50, guid: \"NL7a09b334-7524-102d-a4ef-00163e5faa0c\", version: 0, owner: 118, 
published: 1, loc: [ -9999, -9999 ], logo: \"69db95d0-d58d-40cf-80d3-ac80b8c86af8.png\" }  
can't project geometry into spherical CRS: [ -9999, -9999 ]"

when I try to $set some values on the shop. I see that the values -9999, -9999 are not correct but when I try to replace that with (in Robomongo) other values I get the same error. How can I fix this error, so I can edit the values in loc and do a $set ?

Answer 1

You are correct that the error is because of the invalid geo coordinates you have in that document (see 2dsphere indexes ).

Assuming this is the document you have:

> db.test.find()

{
  "_id": ObjectId("566990eea9c7a38740a305a3"),
  "id": 50,
  "guid": "NL7a09b334-7524-102d-a4ef-00163e5faa0c",
  "version": 0,
  "owner": 118,
  "published": 1,
  "loc": [
    -9999,
    -9999
  ],
  "logo": "69db95d0-d58d-40cf-80d3-ac80b8c86af8.png"
}

The easiest method is to use the mongo shell to perform an update , by using the ObjectId and do a $set on the loc field . For example, by setting the loc field to a valid coordinate (eg [-73.97, 40.77]):

> db.test.update({"_id": ObjectId("566990eea9c7a38740a305a3")}, {$set:{loc:[-73.97, 40.77]}})

Updated 1 existing record(s) in 1ms
WriteResult({
  "nMatched": 1,
  "nUpserted": 0,
  "nModified": 1
})

Note that in the example above, I'm using the _id field, which is guaranteed to be unique, so that the update command will only update that exact document. After that, your 2dsphere index creation should succeed:

> db.test.createIndex({loc:'2dsphere'})

{
  "createdCollectionAutomatically": false,
  "numIndexesBefore": 1,
  "numIndexesAfter": 2,
  "ok": 1
}