Javascript node.js mongodb .. 发现（不可变）字段“_id”已被更改
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node.js mongodb .. the (immutable) field '_id' was found to have been altered
提问by MeetJoeBlack
I have some problem when I try to upsert my object with new ones(parsed from xml file),but I got the following error:
当我尝试使用新对象（从 xml 文件解析）更新对象时遇到一些问题，但出现以下错误：
MongoError: exception: After applying the update to the document {_id: ObjectId('55be3c8f79bae4f80c6b17f8') , ...}, the (immutable) field '_id' was found to have been altered to _id: ObjectId('55be5f15ae
5597401724aab3')
Here is my code:
这是我的代码：
xmlFile.product_list.product.forEach(function (product) {
var productEntity = new Product({
product_id: parseInt(product.id),
parent_id: parseInt(product.parent_id),
sku: product.sku,
title: product.title,
pricenormal: parseFloat(product.price_normal),
pricewholesale: parseFloat(product.price_wholesale),
pricewholesalelarge: parseFloat(product.price_wholesale_large),
pricesale: parseFloat(product.price_sale),
weight: parseFloat(product.weight),
volume: parseFloat(product.volume),
unittype: product.unit_type,
status: product.status,
datecreating: product.datecreating,
sp: product.sp,
guaranteeext: product.guarantee_ext,
used: product.used,
statusfull: product.status_full,
description: null,
url: null
});
items.push(productEntity);
});
items.forEach(function (product) { //update or create new products
Product.findOneAndUpdate({product_id: product.product_id}, product, {upsert: true}, function (err) {
if (err) return updateDBCallback(err);
updateDBCallback(null, 'saved');
});
});
I tried to use hints like:
我尝试使用以下提示：
//product._id = mongoose.Types.ObjectId(); //doesn't work
//delete product._id // doesn't delete _id from product
but they didn't help. So I don't want to update my product._id , I just want to update the other fields.
但他们没有帮助。所以我不想更新我的 product._id ，我只想更新其他字段。
回答by Alfonso Pérez
When you do new Product(), a new _idis generated, along with other things. Try this:
当你这样做时new Product()，_id会生成一个新的，以及其他东西。尝试这个：
items.forEach(function (product) { //update or create new products
// Es6 assign
var productToUpdate = {};
productToUpdate = Object.assign(productToUpdate, product._doc);
delete productToUpdate._id;
Product.findOneAndUpdate({product_id: product.product_id}, productToUpdate,
{upsert: true}, function (err) {
if (err) return updateDBCallback(err);
updateDBCallback(null, 'saved');
});
});
回答by Bharath T
You can use this:
你可以使用这个：
Product.replaceOne({ _id: 55be3c8f79bae4f80c6b17f8}, {
product_id: parseInt(product.id),
parent_id: parseInt(product.parent_id),
sku: product.sku,
title: product.title,
pricenormal: parseFloat(product.price_normal),
pricewholesale: parseFloat(product.price_wholesale),
pricewholesalelarge: parseFloat(product.price_wholesale_large),
pricesale: parseFloat(product.price_sale),
weight: parseFloat(product.weight),
volume: parseFloat(product.volume),
unittype: product.unit_type,
status: product.status,
datecreating: product.datecreating,
sp: product.sp,
guaranteeext: product.guarantee_ext,
used: product.used,
statusfull: product.status_full,
description: null,
url: null});
回答by Fiehra
for anyone coming here from the question:
对于从问题来到这里的任何人：
Performing an update on the path '_id' would modify the immutable field '_id'
my problem when getting the error message was that i was not sending the userdatain my emit(user) method so my backend received an undefined object. because of this the backend tried to replace the already existing user with a user with a different or undefined id
收到错误消息时我的问题是我没有在我的发射（用户）方法中发送用户数据，所以我的后端收到了一个未定义的对象。因此，后端试图用具有不同或未定义 id 的用户替换已经存在的用户
my fix was to emit my user data in my event emitter function in order to use the userData in my updatefunction
我的解决方法是在我的事件发射器函数中发出我的用户数据，以便在我的更新函数中使用 userData
// emit function this.emit(user);
// 发射函数 this.emit(user);
// updateFunction this.profileService.update(user.id);
// updateFunction this.profileService.update(user.id);
hope it helps anyone ending up here when facing the same problem i had at a later moment in time just like myself
希望它可以帮助任何人在遇到我后来遇到的同样问题时，就像我自己一样
