Promise / wait asynchronously from mongoose returning empty array
The console at the end returns an empty array. Console starts before ids.map function completes
var ids = [];
var allLync = []
var user = await User.findOne(args.user)
ids.push(user._id)
user.following.map(x => {
ids.push(x)
})
ids.map(async x => {
var lync = await Lync.find({ "author": x })
lync.map(u => {
allLync.push[u]
})
})
console.log(allLync)
What am I doing wrong?
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1 answer
The code is .map
not expected, so it console.log
will happen before the match occurs.
If you want to wait for the card - you can use Promise.all
with await
:
var ids = [];
var allLync = []
var user = await User.findOne(args.user)
ids.push(user._id)
user.following.map(x => {
ids.push(x)
})
// note the await
await Promise.all(ids.map(async x => {
var lync = await Lync.find({ "author": x })
lync.map(u => {
allLync.push(u); // you had a typo there
})
}));
console.log(allLync)
Note that, since you are using .map
, you can greatly shorten the code:
const user = await User.findOne(args.user)
const ids = users.following.concat(user._id);
const allLync = await Promise.all(ids.map(id => Lync.find({"author": x })));
console.log(allLync);
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