javascript - 图像未上传到nodejs中的数据库

Question

我想使用 put 方法编辑图像，但是当我给出路径时，它显示“文件名”未定义。图像更新，但当我跳到编辑图像时，它显示文件名未定义

app.put('/about_update/:id',upload.single('avatar'),(req,res,next)=>{
console.log(res.file);
aboutus.findById(req.params.id,(err,data2)=>{   
    if(err){
       return res.send(err.message, '404 error from server');

        }
    data2.personName = req.body.personName;
    data2.designation = req.body.designation;
    data2.content = req.body.content;
    data2.avatar = req.file.filename;
    data2.save(function(err){
        if(err){
            res.send(err.message, 'err from server');
        }else{
            res.json({message:'updated successfully'});
        }       
    })

})

})

错误:

事件.js:183 扔呃；//未处理的“错误”事件 ^

类型错误:无法读取未定义的属性“文件名” 在 aboutus.findById (/var/www/html/gis-react-version/api/server.js:147:33) 在/var/www/html/gis-react-version/api/node_modules/mongoose/lib/model.js:4451:16 在 process.nextTick (/var/www/html/gis-react-version/api/node_modules/mongoose/lib/query.js:2476:28)

Answer 1

    if (req.file) {
       data.personName = req.body.personName;
       data.designation = req.body.designation;
       data.content = req.body.content;
       data.avatar = req.file.filename;
    }else{
       data.personName = req.body.personName;
       data.designation = req.body.designation;
       data.content = req.body.content;
   }
aboutus.findByIdAndUpdate(req.params.id, {
            $set: {data}
   }).then(() => {
        res.json({message:'updated successfully'});
     }, (err) => {
         res.json({message:'err from server'});
})