[英]Mongoose updating nested subdocuments
我正在嘗試使用request.body
更新子文檔 mongoose 而不傳遞子文檔_id
。 更新有效,但 mongoose 正在從子文檔中刪除_id
。
假設以下模式
// schemas.js
const mongoose = require('mongoose');
const motorSchema = new mongoose.Schema({
type: String,
volume: Number,
});
const carSchema = new mongoose.Schema({
manufacturer: String,
model: String,
motors: [motorSchema],
});
const userSchema = new mongoose.Schema({
username: String,
email: String,
cars: [carSchema]
});
const mongoose = require('mongoose');
// import schemas
const userSchema = require('userSchema');
const carSchema = require('carSchema');
const motorSchema = require('motorSchema');
// create models
const User = mongoose.model("User", userSchema);
const Car = mongoose.model("Car", carSchema);
const Motor = mongoose.model("Motor", motorSchema);
module.exports.updateCar = async function (request, response) {
const condition = {
_id: new mongoose.Types.ObjectId(request.body.userId),
"cars._id": new mongoose.Types.ObjectIt(request.body.carId)
};
// Build object for partial update
const set = {};
for(let field in reqest.body){
set[`cars.$.${field}`] = request.body[field];
}
const update = {
$set = set;
}
User.findOneAndUpdate(condition, update, {new: true, overwrite: false},
(error, user) => {
if(error) {response.send(error)}
response.json(user);
}
}
問題是我所有的_id
屬性都將在 motors 數組中被覆蓋。 如何強制 mongoose 默認不更改_id
屬性?
如果我理解正確,等效的 mongoDB 語法將使用arrayFilters
,因此您也可以修改查詢以使用它:
例如:
User.findOneAndUpdate(
condition,
{$set: {"cars.$[item].size": "large"}},
{arrayFilters: [{"item._id": new mongoose.Types.ObjectIt(request.body.carId)}]}
)
在playground 示例中查看它是如何工作的
根據此方法,您的代碼需要選項部分中的arrayFilters
和查詢的$set
部分中的$[<identifier>]
:
const set = {};
for(let field in reqest.body){
set[`cars.$[item].${field}`] = request.body[field];
}
const update = {
$set = set;
}
User.findOneAndUpdate(
condition,
update,
{
arrayFilters: [{"item._id": new mongoose.Types.ObjectIt(request.body.carId)}],
new: true, overwrite: false
},
(error, user) => {
if(error) {response.send(error)}
response.json(user);
}
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