图像文件未保存在 MongoDB 中

Question

我正在使用 MERN 技术创建一个新闻文章网络应用程序。

为此，我有以下 Mongoose 架构：

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

let Article = new Schema({
    article_title: {
        type: String,
        required: true
    },
    article_summary: {
        type: String,
        required: true
    },
    article_content: {
        type: String,
        required: true
    },
    article_image: {
        type: String,
        required: true
    },
    article_reference: {
        type: String,
        required: true
    }
});

module.exports = mongoose.model('Article', Article);

还有以下 Express 服务器，我有一个发布方法，将上述信息作为“req.body”和“req.file”使用 Mongoose 和 Multer 保存在数据库中：

const multer = require('multer');
const express = require('express');
const app = express();
const bodyParser = require('body-parser');
const cors = require('cors');
const mongoose = require('mongoose');
const articleRoutes = express.Router();
const PORT = process.env.PORT || 4000;

let Article = require('./article.model');

app.use(cors());
app.use(bodyParser.json());

mongoose.connect('mongodb://127.0.0.1:27017/article', { useNewUrlParser: true, useUnifiedTopology: true });
const connection = mongoose.connection;

connection.once('open', function() {
    console.log("MongoDB database connection established successfully");
});

const storage = multer.diskStorage({
    destination: (req, file, cb) => {
        cb(null, "images");
    },
    filename: (req, file, cb) => {
        cb(null, Date.now() + "--" + file.originalname);
    }
});

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

articleRoutes.route("/content-management-system/add").post(upload.single("article_image"), (req, res) => {
    console.log("START FROM HERE");
    const article = new Article({
        article_title: req.body.article_title,
        article_summary: req.body.article_summary,
        article_content: req.body.article_content,
        article_image: req.file.article_image,
        article_reference: req.body.article_reference
    });
    console.log(article);
    console.log(mongoose.connection.readyState);
    article
        .save()
        .then(() => {
            console.log("Saved successfully!");
            res.status(200).json({'article': 'article saved successfully'});
        })
        .catch(err => {
            console.log("Article save unsuccessful!");
            console.log("article: " + article);
            console.log(req.file);
            console.log(req.body);
            res.status(400).send('adding new article failed');
        });
});

但是，当我在 Postman 上传递一个发布请求时，它会失败并显示 400 错误，说“错误请求”。如您所见，在上面的代码中，我有许多 console.logs 显示了 req.file 和 req.body 和 article 的值>。当我查看控制台时，它显示这些值不包括 article_image。下面是 console.logs 的照片：

对不起，对于许多代码示例，但大部分只是样板代码，问题很简单：为什么我的 article_image 文件，它用 Multer 保存在我的图像文件中，而不是保存在我的 MongoDB 上？

Answer 1

试试article_image: req.file.path 而不是article_image: req.file.article_image