Mongoose populate returning empty array

Question

I am trying to use mongoose populate function but in response I am getting empty array, I have seen multiple posts regarding this

var MerchantSchema = new mongo         


        

Answer 1

Make sure that packages array in Merchant schema contains ObjectIds of type string, (not number). You can ensure this with something like:

merchant.packages.map(r => { r._id = r._id + ''; });