Mongoose filter object in field_name

Question

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I want to list cars by username, how can i do?

Answer 1

 db.cars.aggregate([
        {
          $lookup: {
            from: "users",
            localField: "user",
            foreignField: "_id",
            as: "cars",
          },
        },
        {
          $match: { "cars.name": "Mustafa" },
        },
      ])

Working!!