javascript - Cast to number failed for value "XXX" at path "_id" for model "users" Mongoose Mongodb -

i having problems populating across 2 different models. user , player. each has objectid stored each other. error occurs when try find following populate user model.

user.find().populate('player_id')

data of users player_id

> db.getcollection('users').find({}); { "_id" : objectid("58ea512576f3381d0cdf39a7"), "key" : "c7c7d3611f3d856f7a75eae5303e1cdf", "player_id" : objectid("59b3bff9605cbf7610c15837") } 

data of players

> db.getcollection('players').find(); { "_id" : objectid("59b3bff9605cbf7610c15837"), "user_id" : objectid("58ea512576f3381d0cdf39a7") } 

user model

var userschema = new schema({     name: string,     player_id: {type: schema.objectid, ref: "player", default: null} }) 

player model

var player = new schema({     fname : string,     sname : string,     user_id: {type: schema.objectid, ref: "user", default: null}, }); 

full error message

{ casterror: cast number failed value "59b3bff9605cbf7610c15837" @ path "_id"     @ casterror (/var/www/norsemenfc.co.uk/node_modules/mongoose/lib/error/cast.js:27:11)     @ schemanumber.cast (/var/www/norsemenfc.co.uk/node_modules/mongoose/lib/schema/number.js:231:9)     @ schemanumber.schematype._castforquery (/var/www/norsemenfc.co.uk/node_modules/mongoose/lib/schematype.js:1064:15)     @ schemanumber.castforquery (/var/www/norsemenfc.co.uk/node_modules/mongoose/lib/schema/number.js:282:14)     @ /var/www/norsemenfc.co.uk/node_modules/mongoose/lib/schematype.js:991:18     @ array.map (<anonymous>)     @ schemanumber.handlearray (/var/www/norsemenfc.co.uk/node_modules/mongoose/lib/schematype.js:990:14)     @ schemanumber.castforquery (/var/www/norsemenfc.co.uk/node_modules/mongoose/lib/schema/number.js:280:20)     @ schemanumber.schematype.castforquerywrapper (/var/www/norsemenfc.co.uk/node_modules/mongoose/lib/schematype.js:1016:17)     @ cast (/var/www/norsemenfc.co.uk/node_modules/mongoose/lib/cast.js:250:39)     @ model.query.query.cast (/var/www/norsemenfc.co.uk/node_modules/mongoose/lib/query.js:3109:12)     @ model.query.query._castconditions (/var/www/norsemenfc.co.uk/node_modules/mongoose/lib/query.js:1145:10)     @ model.query.query._find (/var/www/norsemenfc.co.uk/node_modules/mongoose/lib/query.js:1160:8)     @ /var/www/norsemenfc.co.uk/node_modules/kareem/index.js:250:8     @ /var/www/norsemenfc.co.uk/node_modules/kareem/index.js:23:7     @ _combinedtickcallback (internal/process/next_tick.js:131:7)     @ process._tickcallback (internal/process/next_tick.js:180:9)   message: 'cast number failed value "59b3bff9605cbf7610c15837" @ path "_id" model "users"',   name: 'casterror',   stringvalue: '"59b3bff9605cbf7610c15837"',   kind: 'number',   value: 59b3bff9605cbf7610c15837,   path: '_id',   reason: undefined, 

[edit]

query call users

var mongoose = require('mongoose')     user = mongoose.model('user'),     player = mongoose.model('player');  module.exports = {     getall: function(passdata){         return user.find().populate('player_id') //point failure happens             .then(function(data){                 passdata.userdetails = data;                 return passdata;             });     }, 

how objectid's saved

so use mongoose.types.objectid make sure, if stored string don't believe should happen.

    updateuserid: function (req, res) {         var player_id = req.body.user,//string             user_email = req.body.saveplayer; //string         res.setheader('content-type', 'application/json');          return user.find({             email: user_email         }).exec({})         .then(function(data){                 var user_id = data[0]._id; //objectid                 user.update({email: user_email}, {player_id: mongoose.types.objectid((player_id))}, function (err) {                     if(err)                         res.send(json.stringify({status: 0}));                     player.update({_id: player_id}, {user_id: user_id}, function (err) {                         if(err) {                             res.send(json.stringify({status: 0}));                         }else{                             res.send(json.stringify({ status: 1 }));                         }                     })                 })         });     } 

edit 2

route

    home: function (req, res) {         var passdata = {};          api.getall(passdata)             .then(api.getplayerswithoutauser)             .then(function (passdata) {                 res.render('admin/users', {                     user: req.user,                     title: 'admin users',                     selectedadminmenu: 'users',                     passdata: passdata                 });             })             .catch(function (err) {                 console.error(err);             });     }, 

i using mongoose ^4.11.11