Mongodb：值未保存在db中，但存在于schema的console.log中

Question

im是mongo db的新增功能，我试图将图像的URL保存到mongo db中，但该值未保存。但是当我执行console.log时，URL存在于架构中在.save（）之前；

    cloudinary.uploader.upload(file.photo.path, {  folder: 'products' }, function (err, image) {
        if (err) { 
            return res.status(400).json({
                error : "Unable to upload the image"
            })
        }
        console.log(product.photo);
        console.log(image.url);
        product.photo = image.url;
        console.log(product.photo);
        console.log(product);

    }); 

console.log(product);的输出：

{ sold: 0,
  _id: 5edc1830887d5801c88420d9,
  name: 'ider',
  description: 'classic prod',
  price: 10,
  category: 5ed9258ae973f42bbcbef42b,
  stock: 27,
  createdAt: 2020-06-06T22:26:56.136Z,
  updatedAt: 2020-06-06T22:26:56.136Z,
  __v: 0,
  photo:   'http://res.cloudinary.com/xxx/image/upload/v1591482420/products/iwsutsgezodvvbyvopnf.png' } 

产品的保存：

//save to db
product.save((err, prod) => {
    if(err) {
        return res.status(400).json({
            error : "Saving of product failed"
        })
    }
    res.json(prod);
})

响应：

{
    "sold": 0,
    "_id": "5edc1830887d5801c88420d9",
    "name": "ider",
    "description": "classic prod",
    "price": 10,
    "category": "5ed9258ae973f42bbcbef42b",
    "stock": 27,
    "createdAt": "2020-06-06T22:26:56.136Z",
    "updatedAt": "2020-06-06T22:26:56.136Z",
    "__v": 0
}

照片的定义方式是photo: String

完整模式：

const mongoose = require("mongoose");
const { ObjectId } = mongoose.Schema;

const productSchema = new mongoose.Schema(
  {
    name: {
      type: String,
      trim: true,
      required: true,
      maxlength: 32
    },
    description: {
      type: String,
      trim: true,
      required: true,
      maxlength: 2000
    },
    price: {
      type: Number,
      required: true,
      maxlength: 32,
      trim: true
    },
    category: {
      type: ObjectId,
      ref: "Category",
      required: true
    },
    stock: {
      type: Number
    },
    sold: {
      type: Number,
      default: 0
    },
    photo: String
  },
  { timestamps: true }
);

module.exports = mongoose.model("Product", productSchema);

我也用机器人3t检查过，并且分贝中没有照片值

Answer 1

在异步上传完成之前，产品已保存（已在评论中确认）。

将产品保存在图像上传回调中应该可以：

cloudinary.uploader.upload(file.photo.path, {  folder: 'products' }, function (err, image) {
    if (err) { 
        return res.status(400).json({
                error : "Unable to upload the image"
        })
    }
    //save to db
    product.save((err, prod) => {
        if(err) {
            return res.status(400).json({
                error : "Saving of product failed"
            })
        }
        res.json(prod);
    })
 });