node.js - 关于Aync，承诺，等待

Question

result = {};
Promise.all(data2.map(async function(subcat) {
    await productModel.find({ subcategory_id: subcat._id }, function(err4, data4) {
        result.sub_category = subcat;
        result.product = data4;
    });
    return result;
})).then(www => {
    var records = util.inspect(www, false, null, true /* enable colors */);
    console.log(records);
});

我无法通过新对象获得结果。请帮助我。