如果未使用 multer 在 nodejs 中选择文件，则不更新

Question

我正在尝试更新数据。如果我选择文件，它工作正常，但是当我只想更新除文件输入类型之外的任何字段时会出现问题。在这种情况下我无法更新。 我该如何解决？

var storage = multer.diskStorage({
destination: function (req, file, cb) {
  cb(null, './public/uploads/')
},
filename: function (req, file, cb) {
  cb(null, file.originalname+Date.now()+path.extname(file.originalname))
}
});



var upload = multer({ 
storage:storage,
});


app.post('/editProfile', auth, upload.single('image'), async (req, res, next) => {
try {
    const userEmail = req.user.email;
    const name = req.body.name;
    const filename = req.file.filename;
    const contact = req.body.contact;
    console.log(filename + "fghj");
    if(filename) {
    const edited = await User.updateOne({ 'email': userEmail }, {
        $set: {
            name: name,
            contact: contact,
            filename:filename
            }
        });
    }
    else {
        const edited = await User.updateOne({ 'email': userEmail }, {
            $set: {
                name: name,
                contact: contact,
                }
            });
    }
    res.redirect('profile');
}
catch (e) {
    console.log(`while edit profile ${e}`);
    res.status(400).send(e);
}
})

Answer 1

您正在尝试获取filename，但请记住您没有在您的场景中发送文件。这里：

const filename = req.file.filename;

首先，你应该检查一个文件是否存在。

你可以这样修改你的代码：

app.post('/editProfile', auth, upload.single('image'), async (req, res, next) => {
    try {
        const userEmail = req.user.email;
        const name = req.body.name;
        // const filename = req.file.filename; Remove this line from here

        const contact = req.body.contact;

        if (req.file) {
            const filename = req.file.filename // And, use that code when you make sure that you have a file
            const edited = await User.updateOne({ 'email': userEmail }, {
                $set: {
                    name: name,
                    contact: contact,
                    filename: filename
                }
            });
        }
        else {
            const edited = await User.updateOne({ 'email': userEmail }, {
                $set: {
                    name: name,
                    contact: contact,
                }
            });
        }
        res.redirect('profile');
    }
    catch (e) {
        console.log(`while edit profile ${e}`);
        res.status(400).send(e);
    }
})