How to fix 'Updated field become undefined' issue in MongoDb query - node.js

Question

I'm currently writing a mongoDB query to update set of queries in the db, The requirement is to fetch the db entries that has mediaOrigin = 'Kaltura' and the mediaType= 'YOUTUBE', then update the entries as mediaOrigin= 'AWS' and the mediaUrl.dataUrl and mediaUrl.downloadUrl with the value of mediaUrl.originalUrl. So I have completed a script to update the relevent queries but the value that the mediaUrl.dataUrl and mediaUrl.downloadUrl taking is undefined. So how can I solve that, I need to fill that two fields with the value of mediaUrl.originalUrl.
Here is the query I have written,
try {
db.getCollection('media').find({mediaOrigin: { $eq: 'KALTURA' }, mediaType: {$eq: 'YOUTUBE' }, delete: false
})
.forEach(function(media) {
var youtubeUrl = media.mediaUrl.originalUrl;
var Url = youtubeUrl;
db.getCollection('media').update(
{
_id: media._id
},
{
$set: {
'mediaUrl.downloadUrl': Url,
'mediaUrl.dataUrl': Url,
mediaOrigin: 'AWS'
}
}
);
});} catch (e) {
print(e);}
So how can I solve that.
Here I have attached the example entry in the db that I need to update.

Answer 1

You are attaching .forEach end of the .find() method get results from your collection.
You have to wait to get results before sending the result into foreach.
So use it like this:
const medias = await db.getCollection('media').find({
mediaOrigin: { $eq: 'KALTURA' },
mediaType: {$eq: 'YOUTUBE' },
delete: false
}).toArray();
medias.forEach(async(media) => {
var youtubeUrl = media.mediaUrl.originalUrl;
var Url = youtubeUrl;
await db.getCollection('media').update(
{
_id: media._id
},
{
$set: {
'mediaUrl.downloadUrl': Url,
'mediaUrl.dataUrl': Url,
mediaOrigin: 'AWS'
}
}
);
});