Mongoose delete array element in document and save

Question

I have an array in my model document. I would like to delete elements in that array based on a key I provide and then update MongoDB. Is this possible?

Here's my attempt:

var mongoose = require('mongoose'),     Schema = mongoose.Schema;  var favorite = new Schema({     cn: String,     favorites: Array });  module.exports = mongoose.model('Favorite', favorite, 'favorite');  exports.deleteFavorite = function (req, res, next) {     if (req.params.callback !== null) {         res.contentType = 'application/javascript';     }     Favorite.find({cn: req.params.name}, function (error, docs) {         var records = {'records': docs};         if (error) {             process.stderr.write(error);         }         docs[0]._doc.favorites.remove({uid: req.params.deleteUid});          Favorite.save(function (error, docs) {             var records = {'records': docs};             if (error) {                 process.stderr.write(error);             }             res.send(records);              return next();         });     }); }; 

So far it finds the document but the remove nor save works.

Answer 1

You can also do the update directly in MongoDB without having to load the document and modify it using code. Use the $pull or $pullAll operators to remove the item from the array :

Favorite.updateOne({ cn: req.params.name }, {     $pullAll: {         favorites: req.params.deleteUid,     }, }); 

To remove objects from array then

Favorite.updateOne({ cn: req.params.name }, {     $pullAll: {         favorites: [{_id: req.params.deleteUid}],     }, }); 

(you can also use updateMany for multiple documents)

http://docs.mongodb.org/manual/reference/operator/update/pullAll/