NodeJS Mongoose record.save TypeError答案

【问题标题】：NodeJS Mongoose record.save TypeErrorNodeJS Mongoose record.save TypeError
【发布时间】：2018-03-28 08:27:24
【问题描述】：

我正在使用 Express 和 Mongoose 在 NodeJS 上构建一个小型 REST API，但遇到了我似乎无法解决的 TypeError。

Express Router和Mongoose如下：

const Router = require('express').Router;
const router = new Router();
const querystring = require('querystring')
const mongoose = require('mongoose')
const Schema = mongoose.Schema;

const iptvSchema = new Schema({
  appName: { type: String, required: true },
  userId: { type: String, required: true },
  level: { type: String, required: true },
  title: { type: String, required: true },
  message: {type: String},
  meta: {
    ip: {type: String},
    mac: {type: String},
    campus: {type: String},
    venue: {type: String},
    room: {type: String},
    serial: {type: String}
  },
  tags: {type: Array}
});

const Iptv = mongoose.model('Iptv', iptvSchema)

router.route('/add/')
  .all(function(req, res, next) {
    console.log("/add/ route")
    var query = Object.keys(querystring.parse(req.originalUrl))[1]
    console.log(query)
    var record = new Iptv(query);
    record.save(function(err) {
      console.log("save")
      if (err) {
        console.log("error")
        console.log(err)
      } else {
        console.log("record created")
      }
    })
  })


module.exports = router;

传入的请求是来自客户端 JQuery 的 GET AJAX 请求。 query 变量被验证为从 GET 请求中提取的正确 JSON 字符串：

{"appName":"iptv","userId":"0002026941e2","level":"info","title":"Amino Connected"}

请求报错如下：

 TypeError: Cannot use 'in' operator to search for '_id' in {"appName":"iptv","userId":"0002026941e2","level":"info","title":"Amino Connected"}
at model.Document.$__buildDoc (/Users/jeremylo/Documents/dev/log/node_modules/mongoose/lib/document.js:222:24)
at model.Document (/Users/jeremylo/Documents/dev/log/node_modules/mongoose/lib/document.js:67:20)
at model.Model (/Users/jeremylo/Documents/dev/log/node_modules/mongoose/lib/model.js:48:12)
at new model (/Users/jeremylo/Documents/dev/log/node_modules/mongoose/lib/model.js:3785:13)
at /Users/jeremylo/Documents/dev/log/model/iptv/router.js:31:18
at Layer.handle [as handle_request] (/Users/jeremylo/Documents/dev/log/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/jeremylo/Documents/dev/log/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/Users/jeremylo/Documents/dev/log/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/Users/jeremylo/Documents/dev/log/node_modules/express/lib/router/layer.js:95:5)
at /Users/jeremylo/Documents/dev/log/node_modules/express/lib/router/index.js:281:22
at Function.process_params (/Users/jeremylo/Documents/dev/log/node_modules/express/lib/router/index.js:335:12)
at next (/Users/jeremylo/Documents/dev/log/node_modules/express/lib/router/index.js:275:10)
at Function.handle (/Users/jeremylo/Documents/dev/log/node_modules/express/lib/router/index.js:174:3)
at router (/Users/jeremylo/Documents/dev/log/node_modules/express/lib/router/index.js:47:12)
at Layer.handle [as handle_request] (/Users/jeremylo/Documents/dev/log/node_modules/express/lib/router/layer.js:95:5)
at trim_prefix (/Users/jeremylo/Documents/dev/log/node_modules/express/lib/router/index.js:317:13)

非常感谢任何想法。

【问题讨论】：

req.originalUrl 的值是多少？您的查询似乎包含不正确的值。

标签： jquery node.js mongodb express mongoose

【解决方案1】：

您可能传递的是 JSON 字符串而不是 JSON 对象，您需要在创建记录之前将其解析为 JSON 对象

替换

var record = new Iptv(query);

与

var record = new Iptv(JSON.parse(query));

【讨论】：

【解决方案2】：

大多数浏览器都支持 JSON.parse()，它在 ECMA-262 第 5 版（JavaScript 所基于的规范）中定义。它的用法很简单：

var json = '{"appName":"iptv","userId":"0002026941e2","level":"info","title":"Amino Connected"}',
    obj = JSON.parse(json);

console.log(obj.appName);

【讨论】：