Dynamo数据库类型转换错误ValidationException：提供的值无法转换为数字

问题描述

我有一个这样的发电机数据库查询。我执行的将数据添加到两个不同的表中，而这个问题是第一个问题的继续。

I have a dynamo DB query like this. Which I execute to add data to two different table and this question is the continuation of the first question. Using batchWriteItem in dynamodb

  var createuser = {
        "RequestItems": {
          "users": [
            {
              "PutRequest": {
                Item: {
                  "userid": { "N": "usrid" },
                  "role": { "S": 'candidate' },
                  "password": { "S": vucrypt.encryptpass(pass) }
                }
              }
            }
          ],
          "candidate": [
            {
              "PutRequest": {
                Item: {
                  "fname": {
                    "S": req.body.fname
                  },
                  "lname": {
                    "S": req.body.lname
                  },
                  "location": {
                    "S": req.body.location
                  },
                  "phone": {
                    "S": req.body.phone
                  },
                  "ccode": {
                    "S": req.body.ccode
                  },
                  "grad": {
                    "S": req.body.grad
                  },
                  "pgrad": {
                    "S": req.body.pgrad
                  },
                  "ograd": {
                    "S": req.body.ograd
                  },
                  "experience": {
                    "N": "10"
                  },
                  "linkedin": {
                    "S": req.body.linkedin
                  },
                  "terms": {
                    "S": tandc
                  }
                }
              }
            }
          ]
        }
      }

当我将此代码删除时我收到这样的错误。

When i excicute this code i am getting an error like this.

ValidationException: A value provided cannot be converted into a number

我尝试过这个。

var exps = Number(exp);

但是，此错误仍然存​​在，我该怎么办？知道吗？

But still, this error persist what can I do? any idea?

我的代码是这样的。

  dynamodb.batchWriteItem(createuser, function(err, regdata) {
    vulog.debug(regdata);
    if (err || !regdata || regdata.Responses.UnprocessedItems) {
      vulog.warn('ddb: error in checking corp user details1 \n' + err);
      res.send(400, 'Unable to register at present, please try later');
      return;
    }
    vulog.debug('Candidate added successful');

    res.send(200, 'Success! Your account has been created.\n Check your email for further instructions.');
  });

推荐答案

所有值都必须为字符串：

All the values must be strings:

例如：

"fname": {
    "S": req.body.fname
}

，所以只需添加

req.body.fname + ""

OR

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