Comparing JSON array with Mongo array document - mongodb

Question

Currently I have a mongoose model 'Event' that stores a list of UUIDs as participants that reference another model 'User'
.
participants: [{
_id: false,
id: {
type: mongoose.Schema.Types.ObjectId,
ref: 'User'
},
tickets: {
type: Number,
min: 0,
},
}],
winners: [{
type: mongoose.Schema.Types.ObjectId,
ref: 'User'
}],
.
.
Now I receive a request with the following JSON data to update my winners
{
"winners": [
"5f61132da98bac2a98487d79",
"5f611378a98bac2a98487d7a",
"5f611378a98bac2a98487d77"
]}
Is there a way to compare this array with participant field of that model and only allow entry of user ids that are participants? For example
const event = await Event.findOne({_id: _id}, 'participants.id -_id');
console.log(event.participants);
Output:
[
{ id: 5f61132da98bac2a98487d79 },
{ id: 5f611378a98bac2a98487d7a },
{ id: 5f6113b1a98bac2a98487d7b }
]
console.log(req.body.rewards);
[
'5f61132da98bac2a98487d79',
'5f611378a98bac2a98487d7a',
'5f611378a98bac2a98487d77'
]
Clearly the last UUID is not matching (is not a participant) so should be discarded and other two remaining should be updated in winners field. JSON object can be made flexible if needed.

Answer 1

Using aggregation framework does not really help me on this problem, and it might be very costly to project specific elements for a single document only. A work around solution would be using arrays.
const event = await Event.findOne({
_id: _eventId,
rewards: { $elemMatch: { _id: _rewardId }}
}, 'participants.id -_id');
const allParticipants = []
(event.participants).forEach((item) => {
allParticipants.push(item.id.toString());
});
const validIds = (req.body.winners).filter(item => allParticipants.includes(item));
This will check for arrays using includes and filter and return matching array item from the request and participants in the event.