I would like to ask your help , I am trying to search my mongoldb data using many ids via axios request ,
I initiate a request with all the ids to node as following
var data=new FormData()
data.append("offered",offered)
axios ({
url:`http://localhost:5000/items/itemsDetail`,
method:"POST",
data:{offered:offered},
})
Then in the back end Node model,I initiate the queries as following
var offered=req.body.offered
var responsed=[]
offered.forEach(offer=>{
item.findById([offer])
.then(result=>{
console.log(result)
responsed.push(result)
})
res.json({result:response})
individually it works and it logs the individual result("console.log(result)") , but when I try to collect them and send the ["responsed" variable array] back as a one time response, I got an empty object in the axios respond?!
hope you got my point !
I want to send multi queries and got them once .
The problem is that item.findById is an asynchronous function.
In order to return all the data, you need to wait for every item.findById to finish.
Look at the following example :
// Used for the snippet to run without error
const req = {
body: {
offered: [
'foo',
'bar',
],
},
};
// Used to simulate the async function
const item = {
findById: ([d]) => new Promise((r) => setTimeout(() => r(`Response :: ${d}`), 100)),
};
// Used for the snippet to run without error
const offered = req.body.offered;
// Syntax used to be able to use async/await syntax
(async() => {
// Call every findById and wait for them to finish
const response = await Promise.all(offered.map(offer => item.findById([offer])));
console.log({
result: response,
});
})();