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

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.

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