将JSON从模型传递到路由不起作用

我试图将一个对象从一个模型传递到我的路由，这样我就可以完成我的登录系统，但我没有收到任何东西

型号代码：

const AWS = require('aws-sdk');
const bcrypt = require('bcryptjs');
const config = require('../config/config.json');
var dynamoose = require('dynamoose');
const express = require('express');
var Schema = dynamoose.Schema;

const USER_SCHEMA = new Schema({
  username: {
    type: String,
    required: true
  },
  firstName: {
    type: String
  },
  lastName: {
    type: String
  },
  email: {
    type: String,
    required: true
  },
  credential: {
    type: String
  },
  password: {
    type: String,
    required: true
  }
})

const USER = module.exports = dynamoose.model('Usuarios', USER_SCHEMA);

module.exports.getUserByUsername = function (user, callback) {
  var docClient = new AWS.DynamoDB.DocumentClient();

  var params = {
    TableName: "Users",
    KeyConditionExpression: "#us = :uuuu",
    ExpressionAttributeNames: {
      "#us": "username"
    },
    ExpressionAttributeValues: {
      ":uuuu": user
    }
  };
  docClient.query(params, function (err, data) {
    if (err) {
      console.error("Unable to query. Error:", JSON.stringify(err, null, 2));
    } else {
      data.Items.forEach(function (user, callback) {
        console.log(user.username + ": " + user.password + user.email + user.firstName);
      });
    }
    callback(null, user);
  });
}

这很好，我可以打印user.username、user.password等，但由于某些原因，我的路由器没有导入JSON

router.post('/authenticate', (req, res, next) => {
  const username = req.body.username;
  const password = req.body.password;


  USER.getUserByUsername(username, (err, user) => {
    if (err) throw err;
    if (!user) {
      return res.json({
        success: false,
        "msg": "User not found"
      });
    }
    USER.comparePassword(password, user.password, (err, isMatch) => {
      if (err) throw err;
      if (isMatch) {
        const token = jwt.sign({
          username: user
        }, secret.secret, {
          expiresIn: 86400
        });

        res.json({
          success: true,
          token: 'JWT ' + token,
          user: {
            user: user.username,
            password: USER.password,
            email: user.email
          }
        });
      } else {
        return res.json({
          success: false,
          msg: 'Wrong password'
        })
      }
    });
  });
});

comparePassword中的res.json应该是路由（即用户模型）中的对象，但没有接收到任何东西。我尝试过USER.username/email/etc USER.username/email/etc，但没有任何效果。我知道我肯定在什么地方漏掉了什么，但在哪里

这是res.json的响应

{
    "success": true,
    "token": "JWT eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VybmFtZSI6Im5pY29sYXMuZ2FyY2lhIiwiaWF0IjoxNTA5ODE5NjMxLCJleHAiOjE1MDk5MDYwMzF9.ubHbqwOZznoeR0C-FkUoX83MoYPomk5SW1ThIA7ww74",
    "user": {}
}

当然，空用户应该是用户对象

---

修正： 首先，我使用的是

forEach

，因此我必须传递一个索引（

user.Item[0].username

），然后我发现我可以使用一个简单的

.get

函数使用Dynamo DB查询一个项目

现在的型号：

module.exports.getUserByUsername = function (user, callback) {
  var docClient = new AWS.DynamoDB.DocumentClient();

  var params = {
    TableName: 'Users',
    Key: {
      "username": user
    }
  };

  docClient.get(params, function (err, user) {
    if (err) {
      console.error("Unable to read item. Error JSON:", JSON.stringify(err, null, 2));
    } else {
      callback(null, user);
    }
  });
}

顺便说一下，Dynamo DB将项目作为项目返回，因此我现在的路线：

USER.comparePassword(password, user.password, (err, isMatch) => {
      if (err) throw err;
      if (isMatch) {
        const token = jwt.sign({
          username: user
        }, secret.secret, {
          expiresIn: 86400
        });
        res.json({
          success: true,
          token: 'JWT ' + token,
          user: {
            user: user.Item.username,
            password: user.Item.password,
            email: user.Item.email,
            firstName: user.Item.firstName,
            lastName: user.Item.lastName,
            credential: user.Item.credential
          }
        });
      }

---

我还认为您必须更改comparePassword以匹配以下更改

//change comparePassword
USER.comparePassword(password, user, (err, isMatch) => {
      if (err) throw err;
      if (isMatch) {
        const token = jwt.sign({
          username: user
        }, secret.secret, {
          expiresIn: 86400
        });

        res.json({
          success: true,
          token: 'JWT ' + token,
          user: {
            user: user.username,
            password: user.password,
            email: user.email
          }
        });
      } else {
        return res.json({
          success: false,
          msg: 'Wrong password'
        })
      }
    });

---

当您在回调中返回用户对象时，它不在范围内

  docClient.query(params, function (err, data) {
    if (err) {
      console.error("Unable to query. Error:", JSON.stringify(err, null, 2));
    } else {
      data.Items.forEach(function (user, callback) {
        // user exists in this scope
        console.log(user.username + ": " + user.password + user.email + user.firstName);
        // something like...
        if(user) return callback(null, user)
      });
    }
    // user is undefined here
    // callback(null, user);
  });

---

USER.password

应该是

USER.password

？不。这很好，因为我正在通过邮递员传递用户名和密码，而express正在解析该信息，但电子邮件是问题所在。您能确认“USER.username”、“password:USER.password”是否正确吗和user.email在json和您的expressjs版本中不是空的？我发现了错误，我正在从forEach返回对象，我需要传递一个索引。响应：{“success”：true，“token”："JWT eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.EYJ1C2VYBMFtzSi6EYJJDGVTCY6W3SiY3JLZVVVZC3Dvc3dVc3dIgIgIgIgMmKmMeKmTakingNyOf0WZHTURG91RdJJmKmZHzHzH0mKmKmKmWg2Wg2WmKmWg2WmKmKmKmWg2Wg2Wg2WmKmKmKmKmWg2Wg2Wn2Wg2Of2Of9WnWnWnWmKmKmKmKmKmKmKmKmKmKmKmKmKmKmKmWn2WnWnWnWnWnWnWnWbnqiojesilnjyw5uzwrdb3vudci6mx0simlhdci6mtuwotgymdc3mywizzhwijoxnta5ota3mtczfq.msuylqxfmojuxlkv12ypioopbzwm0helef1xtjw，“用户”：{}空用户：(