猫鼬不创建文档

Posted 2023-02-16

【中文标题】猫鼬不创建文档

【英文标题】：mongoose does not create document

【发布时间】：2016-10-06 00:26:18

【问题描述】：

我在 ubuntu 16.04 上使用 nodejs (6.2.1) 和 mongoose(4.4.16) 和 mongodb(2.1.21) 并创建一个注册表单，但是当我提交 mongoose 时不会创建文档并请求继续等待。请帮助我解决问题。以下是文件结构

views 位于完美的 app-server 文件夹中，因此我不包括该结构

app-api
├── controllers
│   └── users.js
├── models
│   ├── db.js
│   └── users.js
└── routes
    └── index.js

路由/index.js

var express = require('express');
var router = express.Router();
var ctrlUsers = require('../controllers/users');

router.get('/user', ctrlUsers.userInfo);
router.post('/signup', ctrlUsers.userSignup);

module.exports = router;

models/db.js

var mongoose  = require( 'mongoose' );
var mongoURI = 'mongodb://localhost/local';
var mongoDB = mongoose.createConnection(mongoURI);

mongoDB.on('connected', function ()
    // console.log("enviorment:" + process.env.NODE_ENV);
    // console.log("mongolab:" + process.env.MONGOLAB_URI);
    console.log('mongoose connected to ' + mongoURI);
);

mongoDB.on('disconnected', function ()
    console.log('mongoose disconnected ');
);

require('./users');

models/users.js

var mongoose = require('mongoose');
var Schema =  mongoose.Schema;

var userSchema = new Schema(
    username: type: String, required: true, unique: true,
    password: type: String, required: true,
    email: type: String, required: true,
    gender: type: Boolean, "default": "m",
    createdOn: type: Date, "default": Date.now
);

module.exports = mongoose.model('User', userSchema);

控制器/users.js

var mongoose  = require( 'mongoose' );
var User = mongoose.model('User');

module.exports.userInfo = function(req,res) 
    res.render('signup', 
        title: 'User List'
    );
;

module.exports.userSignup = function(req,res) 
    console.log(req.body);
    console.log(User);
    if (req.method == 'POST') 
        // console.log("[200] " + req.method + " to " + req.url);
        User.create(
            username: req.body.username,
            password: req.body.password,
            email: req.body.email
        ,function (err, user) 
            console.log(err);
            if(err) handleError(err);
            console.log('User saved successfully!');
        );
    
;

这里console.log(req.body); 输出我们通过表单发送的任何内容

username: 'alpha', email: '[e-mail]', password: 'delta'

和console.log(User) 输出

 [Function: model]
  hooks: Kareem  _pres: , _posts:  ,
  base: 
   Mongoose 
     connections: [ [Object], [Object] ],
     plugins: [],
     models:  User: [Circular], Location: [Object] ,
     modelSchemas:  User: [Object], Location: [Object] ,
     options:  pluralization: true  ,
  modelName: 'User',
  model: [Function: model],
  db: 
   NativeConnection 
     base: 
      Mongoose 
        connections: [Object],
        plugins: [],
        models: [Object],
        modelSchemas: [Object],
        options: [Object] ,
     collections:  users: [Object], locations: [Object] ,
     models:  User: [Circular], Location: [Object] ,
     config:  autoIndex: true ,
     replica: false,
     hosts: null,
     host: null,
     port: null,
     user: null,
     pass: null,
     name: null,
     options: null,
     otherDbs: [],
     _readyState: 0,
     _closeCalled: false,
     _hasOpened: false,
     _listening: false ,
  discriminators: undefined,
  schema: 
   Schema 
     paths: 
       username: [Object],
        password: [Object],
        email: [Object],
        gender: [Object],
        createdOn: [Object],
        _id: [Object],
        __v: [Object] ,
     subpaths: ,
     virtuals:  id: [Object] ,
     singleNestedPaths: ,
     nested: ,
     inherits: ,
     callQueue: [ [Object], [Object] ],
     _indexes: [],
     methods: ,
     statics: ,
     tree: 
       username: [Object],
        password: [Object],
        email: [Object],
        gender: [Object],
        createdOn: [Object],
        _id: [Object],
        id: [Object],
        __v: [Function: Number] ,
     _requiredpaths: undefined,
     discriminatorMapping: undefined,
     _indexedpaths: undefined,
     s:  hooks: [Object], queryHooks: [Object] ,
     options: 
       typeKey: 'type',
        id: true,
        noVirtualId: false,
        _id: true,
        noId: false,
        validateBeforeSave: true,
        read: null,
        shardKey: null,
        autoIndex: null,
        minimize: true,
        discriminatorKey: '__t',
        versionKey: '__v',
        capped: false,
        bufferCommands: true,
        strict: true,
        pluralization: true  ,
  collection: 
   NativeCollection 
     collection: null,
     opts:  bufferCommands: true, capped: false ,
     name: 'users',
     collectionName: 'users',
     conn: 
      NativeConnection 
        base: [Object],
        collections: [Object],
        models: [Object],
        config: [Object],
        replica: false,
        hosts: null,
        host: null,
        port: null,
        user: null,
        pass: null,
        name: null,
        options: null,
        otherDbs: [],
        _readyState: 0,
        _closeCalled: false,
        _hasOpened: false,
        _listening: false ,
     queue: [ [Object] ],
     buffer: true,
     emitter: 
      EventEmitter 
        domain: null,
        _events: ,
        _eventsCount: 0,
        _maxListeners: undefined   

当我在终端上运行mongo 并尝试use local show collections 没有给出任何输出

【问题讨论】：

这是什么models: User: [Circular] ..

恕我直言local 不可复制docs.mongodb.com/manual/reference/local-database。从某种意义上说，您正在写入的数据库可能不是您在终端上引用的那个。

好的。我创建了 db loc8r 并将其更改为 loc8r 仍然是同样的问题

你得到了什么输出？

我已经在 Question 中粘贴了输出

【参考方案1】：

终于从mongoose documentation得到解决方案

重要！如果您使用 mongoose.createConnection() 但尝试通过 mongoose.model('ModelName') 它不会按预期工作，因为它是 未连接到活动的数据库连接。在这种情况下，访问您的 通过您创建的连接建模：

所以现在有两种方法

第一：更改db.js

中的连接字符串

来自

var mongoDB = mongoose.createConnection(mongoURI);

到

  mongoose.connect(mongoURI); 

  var mongoDB = mongoose.connection;

---

第二：更改controllers/users.js中使用.model()的行

var mongoose  = require( 'mongoose' );   
var conn = mongoose.createConnection('mongodb://localhost/loc8r'); 
var User = conn.model('User');