[英]How do I use $addToSet with objects in mongodb?
I want to push only unique objects into an array with $addToSet
.我只想使用
$addToSet
将唯一对象推送到数组中。
My userSchema
has a field bankDetails
which should take an array of objects:我的
userSchema
有一个字段bankDetails
应该包含一个对象数组:
const userSchema = new mongoose.Schema(
{
bankDetails: [
{
cardHolder: String,
cardNumber: String,
expiry: String,
cvc: String,
cardBrand: String,
},
]
}
)
I am updating the schema using the following controller function:我正在使用以下 controller function 更新架构:
exports.createPayment = async (req, res) => {
const { user, cardHolder, cardNumber, expiry, cvc, cardBrand } = req.body
const saveDetails = await User.findByIdAndUpdate(
{ _id: user._id },
$addToSet: {
bankDetails: {
cardHolder,
cardNumber,
expiry,
cvc,
cardBrand,
},
},
{ new: true }
).exec();
res.json(saveDetails);
}
The data is saving correctly but Mongo auto generates an _id
field every time so technically none of the objects are unique and the objects are repeatedly added.数据保存正确,但 Mongo 每次都会自动生成一个
_id
字段,因此从技术上讲,没有一个对象是唯一的,并且对象是重复添加的。
Is anyone aware of a workaround for this?有人知道解决方法吗?
You could check if a bank already exists, and add it only if not present:您可以检查银行是否已经存在,并仅在不存在时添加:
exports.createPayment = async (req, res) => {
const { user, cardHolder, cardNumber, expiry, cvc, cardBrand } = req.body;
const existingBank = await User.findOne({
'bankDetails.cardHolder': cardHolder,
'bankDetails.cardNumber': cardNumber,
'bankDetails.expiry': expiry,
'bankDetails.cvc': cvc,
'bankDetails.cardBrand': cardBrand,
});
if (existingBank) return res.json(existingBank);
const saveDetails = await User.findByIdAndUpdate(
user._id,
{
$addToSet: {
bankDetails: {
cardHolder,
cardNumber,
expiry,
cvc,
cardBrand,
},
},
},
{ new: true }
).exec();
res.json(saveDetails);
};
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