mgo $unwind aggregation result to Unknown element kind (0x2E)

[jeane paul Soliva]

I have originally posted it from SO http://stackoverflow.com/questions/32716402/mgo-unwind-aggregation-result-to-unknown-element-kind-0x2e

I have an aggregate query like this

`$ db.histories.aggregate([{$match:{"issue_id":{$in:ids},"history_comment":{$exists:true,$not:{$size:0}}}},{$unwind:"$history_comment"}])`

translating this to `go` using `mgo`

    var h []History

query := []bson.M{

{"$match": bson.M{

"issue_id":        bson.M{"$in": IDs},

"history_comment": bson.M{"$exists": true, "$not": bson.M{"$size": 0}}}},

        {"$unwind": "$history_comment"},

}

err := c.Pipe(query).All(&h)

but I received an `err`

 

`Unknown element kind (0x2E)`

how is this possible? is my query wrong? really appreciate any help. 

[Faisal KK]

Hi ,

I have given comment in StackOF.

It seems like your data can't be decoded by bson function.

Could you give some details of data you are trying to aggregate ?

Regards,

Faisla K K

[Gustavo Niemeyer]

As Faisal and the errors itself points out, the data being handed to the driver has an unknown element kind.

If you look at the BSON specification, there's no 0x2E in there:

    http://bsonspec.org/spec.html

If you think this is an issue in the driver, can you please provide a dump of the offending data that can be loaded into the driver, and open an issue with it?

Thanks,

--
You received this message because you are subscribed to the Google Groups "mgo-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to mgo-users+...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

--

gustavo @ http://niemeyer.net