如果未使用 multer 在 nodejs 中选择文件，则不更新

Posted 2023-02-16

【中文标题】如果未使用 multer 在 nodejs 中选择文件，则不更新

【英文标题】：not updating if file is not selected in nodejs using multer

【发布时间】：2022-01-22 19:20:05

【问题描述】：

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);

)

【参考方案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);
    
)

【讨论】：

还是不行。得到同样的错误