Mongoose 删除文档中的数组元素并保存 [英] Mongoose delete array element in document and save
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问题描述
我的模型文档中有一个数组.我想根据我提供的键删除该数组中的元素,然后更新 MongoDB.这可能吗?
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?
这是我的尝试:
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();
});
});
};
到目前为止它找到了文档,但删除或保存都有效.
So far it finds the document but the remove nor save works.
推荐答案
您也可以直接在 MongoDB 中进行更新,而无需加载文档并使用代码对其进行修改.使用 $pull
或 $pullAll
运算符从数组中删除项目:
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],
},
});
(您也可以对多个文档使用 updateMany)
(you can also use updateMany for multiple documents)
http://docs.mongodb.org/manual/reference/运算符/更新/pullAll/
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