node.js - Need to send response after forEach is done -


i'm working nodejs + mongoose , i'm trying populate array of objects , send client, can't it, response empty because sent before foreach ends.

router.get('/', isauthenticated, function(req, res) { order.find({ seller: req.session.passport.user }, function(err, orders) {     //handle error       var response = [];       orders.foreach(function(doc) {         doc.populate('customer', function(err, order) {           //handle error           response.push(order);         });       });       res.json(response);   }); });

is there way send after loop has finished?

basically, use solution async control flow management async or promises (see laggingreflex's answer details), recommend use specialized mongoose methods populate whole array in 1 mongodb query.

the straightforward solution use query#populate method populated documents:

order.find({   seller: req.session.passport.user }).populate('customer').exec(function(err, orders) {   //handle error   res.json(orders); });

but if, reason, can't use method, call model.populate method populate array of fetched docs:

order.populate(orders, [{   path: 'customer' }], function(err, populated) {   // ... });

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