Populating array of Id's with aggregation in mongoose

Question

I am trying to populate array of id's in aggregation method using $lookup in mongoose. I am using mongoose 6.6.2. Here is how I am storing data in mongoDB

and this is the query I am using

await mongoose.models.xyz.aggregate([
        {
          $lookup: {
            from: '$dietaries',
            localField: 'dietaries',
            foreignField: '_id',
            as: 'dietaries'
          }
        }
      ]);

I am getting empty array as return.

AdamExchange · Accepted Answer · 2022-11-09 11:24:10Z

2

I'm guessing the problem is with this line from: '$dietaries'

If your collection is named "dietaries", it should be from: 'dietaries'. You don't need the $ there.

answered Nov 9, 2022 at 11:24

AdamExchange

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