new Schema({
pid: {type: String, ref: "product" },
sid: {type: String, ref: "sale" },
}));suppose there are product and sale two collections
pid and sid both specify user_id of the product and sale collections instead of _ id
padding with populate always associates pid with the _ id of product, and then cannot be queried
is there any way that pid and sid specify user_id instead of _ id
seek the answer of the Great God
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