How to call javascript function in mongodb query

Question

I want to call a function in mongodb query. Is there any way to do such thing or is there any other way to do that

Example:

const imageUrl = function(imageName) {
  const urlParams = {Bucket: 's3-bucket/uploads', Key: imageName};
  s3bucket.getSignedUrl('getObject', urlParams, async function (err, url) {
    console.log('imageUrl', url);
  });
}

const feedTest = await Feed.aggregate([
  {
    $project: {
      _id: 1,
      feedImage: imageUrl(feedImage),
    }
  }
]);

Please mark answer as accepted in case if it worked for you

Sasha Pomirkovany
– Sasha Pomirkovany

2018-08-14 15:26:25 +00:00
Commented Aug 14, 2018 at 15:26 — Sasha Pomirkovany
– Sasha Pomirkovany, Commented Aug 14, 2018 at 15:26

pizzaisdavid · Accepted Answer · 2019-07-30 15:04:01Z

2

You can't execute a function as part of mongo query, but you can pass the result there. The problem is that you would need to make your query inside of the callback. But that can be managed with promises and async/await:

const imageUrl = function(imageName) {
    const urlParams = {Bucket: 's3-bucket/uploads', Key: imageName};
    return new Promise((resolve, reject) => {
        s3bucket.getSignedUrl('getObject', urlParams, (err, url) => {
            if (err) {
               reject(err)
            } else {
               resolve(url)
            }
        })
     })
}

const feedTest = await Feed.aggregate([ {
    $project:{
        _id: 1,
        feedImage: await imageUrl(feedImage),
    }
}

edited Jul 30, 2019 at 15:04

pizzaisdavid

4693 silver badges14 bronze badges

answered Aug 14, 2018 at 13:56

Sasha Pomirkovany

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