javascript - 类型错误 : Cannot read property 'location' of undefined

Question

一直在尝试使用 AWS S3(Multer 和 MulterS3)发布带有图像的产品。每次我使用 postman 时，我都会收到“TypeError:无法读取未定义的属性‘位置’”，这是我拥有 Image 变量的行。我做错了什么？

这是我的代码:

const router = require('express').Router();
const Product = require('../models/product');

const aws = require('aws-sdk');
const multer = require('multer');
const multerS3 = require('multer-s3');
const s3 = new aws.S3({ accessKeyId: "--", secretAccessKey: "--"});

const checkJWT = require('../middlewares/check-jwt');





var upload = multer({
    storage: multerS3({
        s3: s3,
        bucket: '365techhubwebapplication',
        metadata: function(req, file, cb) {
            cb(null, {fieldName: file.fieldName});
        },
        key: function (req, file, cb) {
            cb(null, Date.now().toString())
          }
          
    })
});


router.route('/products')
.get((req, res, next) => {
    res.json({
        success: "Hello"
    });
})

.post([checkJWT, upload.single('product_picture')], (req, res, next) => {
     console.log(upload);
     console.log(req.file);
    let product = new Product();
    product.owner = req.decoded.user._id;
    product.category = req.body.categoryId;
    product.title = req.body.title;
    product.price = req.body.price;
    product.description = req.body.description;
    product.image = req.file.location;
    
    product.save();
    res.json({
        success: true,
        message: 'Successfully Added the product'
    });
});

module.exports = router;

Answer 1

您的 req.file 未定义，请发送 req.file 或添加检查并更新您的代码，如下所示:

.post([checkJWT, upload.single('product_picture')], (req, res, next) => {
     console.log(upload);
     console.log(req.file);
    let product = new Product();
    product.owner = req.decoded.user._id;
    product.category = req.body.categoryId;
    product.title = req.body.title;
    product.price = req.body.price;
    product.description = req.body.description;
    if (req.file) { // Checking if req.file is not empty.
        product.image = req.file.location;
    }
    product.save();
    res.json({
        success: true,
        message: 'Successfully Added the product'
    });
});