Javascript MULTER-S3:TypeError:无法将对象转换为原语值…；直接[作为_立即回拨]

我正在使用Multer-s3构建一个MEAN stack应用程序，将图像上传到我的数据库。但是，当我调用上载函数时，会出现以下错误：

POST http://localhost:3000/api/upload/single 500 (Internal Server Error)
TypeError: Cannot convert object to primitive valu…diate [as _immediateCallback](timers.js:354:15)↵", status: 500, config: Object, statusText: "Internal Server Error"

在我的服务器端app.js中

    // MULTER
    var s3config = require('./config/s3');
    var upload = multer({
      storage: s3({
        dirname: s3config.dirname,
        bucket: s3config.bucket,
        secretAccessKey: process.env.AWS_ACCESS_SECRET,
        accessKeyId: process.env.AWS_ACCESS_KEY,
        region: s3config.region,
        contentType: function(req, file, next) {
          next(null, file.mimetype);
        },
        filename: function(req, file, next) {
          var ext = '.' + file.originalname.split('.').splice(-1)[0];
          var filename = uuid.v1() + ext;
          next(null, filename);
        }
      })
    });

    // UPLOAD SINGLE FILE
    app.post('/api/upload/single', upload.single('file'), function(req, res) {
      var clothing_1 = {
        type: req.body.type,
        image: req.file.key
      };
      console.log('req.body =' + req.body);
      console.log('req.body.type =' + req.body.type);
      console.log('req.file.key =' + req.file.key);
      // get the user model User.findOne({ id: req.user._id })
      User.findOne({ _id: req.user._id }, {}, { new: true }, function(err, user){
        user.clothing.push(clothing_1);
        // save this user
        user.save(function(err, user){
          if(err) return res.status(401).send({ message: 'your error:' + err });
          else return res.json({ user: user })
        });
      });

    });

在我的前端控制器中：

  self.uploadSingle = function() {
    Upload.upload({
      url: API + '/upload/single',
      data: { file: self.file, type: self.clothingType }
    })
    .then(function(res) {
        self.usersClothing = res.data.user.clothing.map(function(clothing) {
            clothing.image = S3_BUCKET + clothing.image;
            return clothing;
        });
    })
    .catch(function(err) {
      console.error(err);
    });
  }

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这个功能是在我按下上传按钮时执行的。

只是因为服务器找不到req.body在文档中提供的用户id

 User.findOne({ _id: req.user._doc._id } fixed the issue

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只是服务器找不到req.body在文档中提供的用户id的问题

 User.findOne({ _id: req.user._doc._id } fixed the issue

---

删除Console.logs后，错误切换为：TypeError:cannotreadproperty'_身份证号码'；未定义的原因很简单，就是服务器无法在req.body给出的_id中找到用户。User.findOne（{u-id:req.User.\u-doc.\u-id}修复了删除控制台后的问题。日志错误已切换为：TypeError:cannotreadproperty'；#id'；#id'；#unfinedwas仅仅是服务器无法在#u-doc.User.findOne（{id:req.User.\u-doc id}修复了该问题