javascript - How to populate a group in mongoose -

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i have in mongoose schema...with group...

'use strict';  var mongoose = require('mongoose') , schema = mongoose.schema;  var clientschema = new mongoose.schema({      name                                : { type: string },     offerings                   : [{ type: string }],     cscpersonnel                : {         salesexec                   : { type: schema.types.objectid, ref: 'user' },         accountgm                   : { type: schema.types.objectid, ref: 'user' }, },     },     netpromoterscore        : { type: number }  });  module.exports = mongoose.model('clients', clientschema);

i tried populate reff dis way...i have populated in ref (user {path:'cscpersonnel'})

function getonebyid(id){     var deferred = q.defer(); console.log("im in id" +id);     model         .findone({ _id: id })         .populate({path:'cscpersonnel'})//one way            /* 'cscpersonnel salesexec',   //second way             'cscpersonnel accountgm', */         .exec(function (err, item) {             if(err) {                 console.log(err);                 deferred.reject(err);             }             else                 console.log(item);                 deferred.resolve(item);         });      return deferred.promise; } // gentonebyid method ends

but unfortunatly ended error!!!!

casterror: cast objectid failed value "[object object]" @ path "_id"

{   "message": "cast objectid failed value \"[object object]\" @ path \"_id\"",   "name": "casterror",   "type": "objectid",   "value": {     "salesexec": "56cf5f09245f8a240b30693b",     "accountgm": "56cf5f09245f8a240b30693b"   },   "path": "_id" }

how make solve issue.... do , in advance

please try one

model     .findone({ _id: id })     .populate({path: 'cscpersonnel.salesexec'})     .populate({path: 'cscpersonnel.accountgm'})     .exec(function (err, item) {

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