node.js - Mongoose grouping error -

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i got trouble filter , group on mongodb. didn't undertanded how works.

for example, in query:

room.aggregate( [{     "$where": { "roomid" : myidhere },     "$group": {         "_id": '$mobileuser.gendertype',         "gendertypecount": {             "$sum": 1         }     } }]

room model:

var roommodelschema = mongoose.schema({     roomid: string,     mobileuser: {         facebookid: string,         email: string,         name: string,         photourl: string,         gendertype: string,         birthday: date,         city: string         },     insertdate: date })

what should filter roomid , group gendertype?

use $match instead of $where, , put each pipeline operation own object:

room.aggregate([     { "$match": { "roomid" : myidhere } },     { "$group": {         "_id": '$mobileuser.gendertype',         "gendertypecount": {             "$sum": 1         }     }} ], function(err, result) {...})

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