models/favoriteModel.js

const mongoose = require("mongoose");

const favoriteSchema = new mongoose.Schema(
  {
    user: {
      type: mongoose.Schema.Types.ObjectId,
      ref: "User",
      required: true,
      unique: true
    },
    products: [
      {
        type: mongoose.Schema.Types.ObjectId,
        ref: "Product"
      }
    ]
  },
  { timestamps: true }
);

module.exports = mongoose.model("Favorite", favoriteSchema);