猫鼬:如何更新数组中的现有元素? [英] Mongoose: How to update an existing element in array?
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问题描述
我想知道是否有更好的方法来更新数组中的现有元素,而不是三次获取数据库.如果您有任何想法,我将不胜感激.谢谢!
I was wondering if there is a better way to update an existing element in an array instead of fetching database three times. If you have any ideas I would appreciate it. Thank you!
const creatStock = async (symbol, webApiData) => {
try {
// reversed array
const webApiDataReversed = webApiData.reverse();
const query = { symbol };
const update = { $addToSet: { data: webApiDataReversed } };
const options = { upsert: true, new: true };
// create/update Stock
const stockResult = await Stock.findOneAndUpdate(query, update, options);
const lastElement = stockResult.data.length - 1;
const updatePull = {
$pull: { data: { date: stockResult.data[lastElement].date } },
};
// removes last date from data array
await Stock.findOneAndUpdate(query, updatePull);
// update Stock
await Stock.findOneAndUpdate(query, update);
} catch (ex) {
console.log(`creatStock error: ${ex}`.red);
}
};
架构
const ChildSchemaData = new mongoose.Schema({
_id: false,
date: { type: mongoose.Types.Decimal128 },
open: { type: mongoose.Types.Decimal128 },
high: { type: mongoose.Types.Decimal128 },
low: { type: mongoose.Types.Decimal128 },
close: { type: mongoose.Types.Decimal128 },
volume: { type: mongoose.Types.Decimal128 },
});
const ParentSchemaSymbol = new mongoose.Schema({
symbol: {
type: String,
unique: true,
},
// Array of subdocuments
data: [ChildSchemaData],
});
module.exports.Stock = mongoose.model('Stock', ParentSchemaSymbol);
输出
推荐答案
好吧,如果您不需要返回更新的文档,请尝试执行此操作-这只会返回写入结果,可以实现此目的在一个数据库调用中:
Well, if you don't need to return the updated document, Please try this one - this will just return a write result, with this things can be achieved in one DB call :
const creatStock = async (symbol, webApiData) => {
try {
// reversed array
const webApiDataReversed = webApiData.reverse();
const query = { symbol };
await Stock.bulkWrite([
{
updateOne:
{
"filter": query,
"update": { $pop: { data: 1 } }
}
}, {
updateOne:
{
"filter": query,
"update": {
$addToSet: {
data: webApiDataReversed
}
}
}
}
])
} catch (ex) {
console.log(`creatStock error: ${ex}`.red);
}
};
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