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作爲我在How to push array elements to an array if _id of documents already exists and create new document if _id doesn't exist?中的問題的解決方案,我編寫了下面的代碼。callback.apply在節點js中不起作用
但是這給出了一個錯誤說TypeError:callback.apply不是函數。我對此不太瞭解。任何人都能解決這個錯誤?
code
router.post("/saveMCQAnswer", function(req, res) {
Survey.findOneAndUpdate(
{ "_id": '0001'},
{ "surveyname": 's1' }, /* <query> */
{ /* <update> */
"$push": {
"replies": {
"_id" : 'R001',
"answers": {
"_id" : 'A001',
"answer" : 'answer'
}
}
}
},
{ "upsert": true }, /* <options> */
function(err, doc){ /* <callback> */
if(err) res.json(err);
else
req.flash('success_msg', 'Question saved to QBank');
res.redirect("/");
}
);
});