Add metadata on subscriptions

[neolas]

I make a subscription with a custom controller which permits to force filters on backend-side. I would like add some metadatas informations in order to apply some specific soperation on content before notify in my custom pipe (cf #790). For this, I try to add content in request.input.metadata when I make subscription but the field metadata is not filled in notification.

Custom controller :

var filters = {
    equals: {
        'metas.id':request.input.body.thingID,
    }
}
request.input.resource.index = request.input.body.universID;
request.input.resource.collection = 'things';
request.input.body = {};
request.input.body = filters;
request.input.metadata = {'hello':'world'};

this.context.accessors.kuzzle.hotelClerk.addSubscription(request)
    .then(res => { 
        resolve(res); 
    })
    .catch(err => { reject(err);});

I want have metadata {'hello':'world'} in every notifications in this channel. Is it possible by this way and it's a bug or another technique exists ?

Thanks,

[ballinette]

Hi. The medatada option (actually, it will be renamed in volatile in next release) are used to propagate volatile data from the input request to the response.

While subscribing to a room, it is only used to be propagated to other users that are notified about a new subscription, or a leaving subscription, not about other document (see http://docs.kuzzle.io/api-reference/?others#subscribe-to-a-room )

We should discuss about your use case to find the best alternative for that.

[scottinet]

Should be possible after https://github.com/kuzzleio/kuzzle/issues/790 is implemented.