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);
}
};
Schema
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);
Output
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);
}
};
Ref: mongoDB bulkWrite
you can do like this way:
const creatStock = async (symbol, webApiData) => {
try {
// reversed array
const webApiDataReversed = webApiData.reverse();
const query = { symbol };
let stock = await Stock.findOne(query);
if(stock){
let stockData = JSON.parse(JSON.stringify(stock.data));
if(stockData.length>0){
stockData.pop();
}
stockData.concat(webApiDataReversed);
stock.data = stockData;
await stock.save();
}
} catch (ex) {
console.log(`creatStock error: ${ex}`.red);
}
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