javascript - Mongoose model not including added value when returned -

i trying 2 queryies , combine them , send client... here middleware:

exports.shipmentbyid = function(req, res, next, id) {      shipment.findbyid(id)         .populate('user', 'displayname')         .exec(function(err, shipment) {             if (err) return next(err);             if (! shipment) return next(new error('failed load shipment ' + id));              vendorinvoice.find({ shipment: id })                 .exec(function (err, vendorinvoices) {                     if (err) return next(err);                     if (! vendorinvoices) return next(new error('failed load shipment ' + id));                      shipment.vendorinvoices = vendorinvoices;                      req.shipment = shipment;                     next();                 });         }); }; 

and controller method called

exports.read = function(req, res) {     console.log(req.shipment.vendorinvoices); // note prints data looking     res.jsonp(req.shipment); }; 

but on client of values vendorinvoices:

{   __v: 0   _id: "5583af682b46ec9353963dc4"   created: "2015-06-19t05:58:00.434z"   dateinvoiced: "2015-06-18t07:00:00.000z"   shipmentid: "12345"   user: {_id: "549268852f54d06f4d0720ce", displayname: "troy cosentino"} } 

i'm stuck, why wouldn't pass through?

you try returning plain javascript object instead of mongoose model instance calling lean() method on query chain follows:

shipment.findbyid(id)     .populate('user', 'displayname')     .lean()     .exec(function(err, shipment){         if (err) return next(err);         if (! shipment) return next(new error('failed load shipment ' + id));          vendorinvoice.find({ shipment: id })             .exec(function (err, vendorinvoices) {                 if (err) return next(err);                 if (! vendorinvoices) return next(new error('failed load shipment ' + id));                  shipment.vendorinvoices = vendorinvoices;                  req.shipment = shipment;                 next();             });  });