[Fiware-tech-help] tech question on STH-comet

[Ypma, Wout (ext)]

Hello,
I’m currently using a setup with orion->cygnus-> mongo <-sth-comet.
I’d like to use the API of sth-comet to query the mongodb data stored by Cygnus. Currently, the data is landing fine in mongo, but I’m not able to query the data with sth-comet. When I send a query to sth-comet I get a statuscode 200 with body:

{
    "contextResponses": [
        {
            "contextElement": {
                "attributes": [
                    {
                        "name": "temperature",
                        "values": []
                    }
                ],
                "id": "einaireas14",
                "isPattern": false,
                "type": "AirQualityObserved"
            },
            "statusCode": {
                "code": "200",
                "reasonPhrase": "OK"
            }
        }
    ]
}

In the sth-comet container I can see the following error:

DEBUG GET /STH/v1/contextEntities/type/AirQualityObserved/id/einaireas14/attributes/temperature?hLimit=3&hOffset=0&dateFrom=2019-02-18T00:00:00.000Z&dateTo=2019-02-18T23:59:59.999Z { corr: '2fcffad3-62d9-48b7-b991-c43abd9d0bb8',
        trans: '2fcffad3-62d9-48b7-b991-c43abd9d0bb8',
        op: 'OPER_STH_GET',
        from: 'n/a',
        srv: 'default',
        subsrv: '/',
        comp: 'STH' }
DEBUG Getting access to the raw data collection for retrieval... { corr: '2fcffad3-62d9-48b7-b991-c43abd9d0bb8',
        trans: '2fcffad3-62d9-48b7-b991-c43abd9d0bb8',
        op: 'OPER_STH_GET',
        from: 'n/a',
        srv: 'default',
        subsrv: '/',
        comp: 'STH' }
WARN  Error when getting the raw data collection for retrieval (the collection 'null' may not exist) { corr: '2fcffad3-62d9-48b7-b991-c43abd9d0bb8',
        trans: '2fcffad3-62d9-48b7-b991-c43abd9d0bb8',
        op: 'OPER_STH_GET',
        from: 'n/a',
        srv: 'default',
        subsrv: '/',
        comp: 'STH' }

I am not able to figure out why the collection name that sth comet is looking for is ‘null’. Im not violating any database/collection naming rules of mongodb as far as I can see. Could you tell me what is going on?

Regards,
Ir. Wout Ypma
Data Scientist
M: +31 6 36197510
linkedin.com/in/wout-ypma/<http://www.linkedin.com/in/wout-ypma/>

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