multer中的req.file始终返回未定义

Question

我的下面的代码

const express = require("express");
const router = express.Router();
const mongoose = require("mongoose");
const path = require("path");
const bodyParser = require("body-parser");

下面是multer的配置。

const multer = require("multer");

const upload = multer({ dest: 'uploads/'});

编辑：1。 还尝试了这种配置，而不是直接上传变量。但这也不起作用。

 const storage = multer.diskStorage({
  destination: (req, file, cb) => {
    cb(null, "./uploads/");
  },
  filename: (req, file, cb) => {
    cb(null, new Date().toISOString() + file.originalname);
  }
});

const fileFilter = (req, file, cb) => {
  if (file.mimetype === "image/jpeg" || file.mimetype === "/image/png") {
    cb(null, true);
  } else {
    cb(null, false);
  }
};
const upload = multer({
  storage: storage,
  limits: {
    fileSize: 1024 * 1024 * 5
  },
  fileFilter: fileFilter
});

产品添加表单处理。 在这里，我正在处理表单，console.log总是返回undefined。

router.post("/productadd", upload.single("image"), (req, res) => {
  console.log(req.file);
  const newProduct = {
    imagePath: "https://source.unsplash.com/random/480*480",
    title: req.body.title,
    description: req.body.description,
    price: req.body.price
  };

  new Products(newProduct).save().then(product => {
    res.redirect("/products");
  });
});

这是我上传文件的表格

<form action="/productadd" Method="post" enctype="multipart/form-data">

    <div class="form-group">
      <label for="title">Title</label>
      <input type="text" class="form-control" name="title" placeholder="Enter the Title">
    </div>

    <div class="form-group">
      <label for="description">Description</label>
      <textarea name="description" id="" cols="30" rows="10" class="form-control" placeholder="Enter the content"></textarea>
    </div>
    <div class="form-group">
      <label for="price">Price</label>
      <input type="number" class="form-control" name="price" placeholder="Enter the Price">
    </div>
    <div class="form-group">
      <label for="image">Choose an Image:</label>
      <input type="file" class="form-control" name="image" />
    </div>
    <button class="btn btn-primary btn-sm" type="submit">Submit</button>