NodeJs: multer在mongoose数据验证前上传文件

npm install multer mongoose

const express = require('express');
const multer = require('multer');
const mongoose = require('mongoose');

const storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, 'uploads/') // 上传文件保存的目录
  },
  filename: function (req, file, cb) {
    cb(null, file.originalname) // 上传文件的原始文件名
  }
});

const upload = multer({ storage: storage });

const app = express();

app.post('/upload', upload.single('file'), function (req, res, next) {
  // 文件上传成功后的处理逻辑
  res.send('文件上传成功');
});

const Schema = mongoose.Schema;

const fileSchema = new Schema({
  name: {
    type: String,
    required: true
  },
  path: {
    type: String,
    required: true
  },
  size: {
    type: Number,
    required: true
  }
});

const File = mongoose.model('File', fileSchema);

app.post('/upload', upload.single('file'), function (req, res, next) {
  // 创建一个File实例并保存到数据库
  const file = new File({
    name: req.file.originalname,
    path: req.file.path,
    size: req.file.size
  });

  file.save(function (err) {
    if (err) {
      // 数据保存失败的处理逻辑
      res.status(500).send('文件保存失败');
    } else {
      // 数据保存成功的处理逻辑
      res.send('文件上传成功');
    }
  });
});