当model '编译后不能覆盖' User '模型;& # 39;编译一次(或者我已经监督了一些东西)

Cannot overwrite `User` model once compiled while model ' ' is compiled once (or I have overseen something)

本文关键字：编译 或者 model 模型 User 覆盖 不能 一次      更新时间：2023-09-26

你能帮我吗?我看不出有什么问题。

下面是server.js中的代码片段: 
var mongoose = require('mongoose');
var MongoClient = require('mongodb').MongoClient
  , assert = require('assert');
var db = 'nodebook';
var url = ''
mongoose.createConnection('mongodb://localhost/'+db);
// The User
   var User = mongoose.model('User', {
     username: String,
     password: String,
     biography: String,
     image: String,
   });

每次" node " server.js时都会出现。顺便说一句。我是node.js/mongoose的新手。

来自终端的错误:

/Users/davidnoldner/node_modules/mongoose/lib/index.js:360
      throw new mongoose.Error.OverwriteModelError(name);
      ^
OverwriteModelError: Cannot overwrite `User` model once compiled.
    at Mongoose.model (/Users/davidnoldner/node_modules/mongoose/lib/index.js:360:13)
    at Server.<anonymous> (/Users/davidnoldner/Librament/server.js:46:21)
    at emitTwo (events.js:87:13)
    at Server.emit (events.js:172:7)
    at HTTPParser.parserOnIncoming [as onIncoming] (_http_server.js:533:12)
    at HTTPParser.parserOnHeadersComplete (_http_common.js:103:23)

可能有用- mongod console:

2016-09-15T08:32:07.973+0200 W NETWORK  [HostnameCanonicalizationWorker] Failed to obtain name info for: [ (2620:9b::5dd:4570, "nodename nor servname provided, or not known"), (2620:9b::5dd:4570, "nodename nor servname provided, or not known"), (192.168.0.16, "nodename nor servname provided, or not known"), (5.221.69.112, "nodename nor servname provided, or not known"), (192.168.0.16, "nodename nor servname provided, or not known"), (5.221.69.112, "nodename nor servname provided, or not known") ]

谢谢!

您在初始化mongoose模型时犯了一个错误，并且没有遵循正确的语法和文档。参考此链接的猫鼬文档。

var mongoose = require('mongoose');
var MongoClient = require('mongodb').MongoClient
   ,assert = require('assert');
var db = 'nodebook';
var url = ''
mongoose.createConnection('mongodb://localhost:27017/'+db);
const Schema = mongoose.Schema;
// The User
var User = mongoose.model('User', new Schema({
    username: String,
    password: String,
    biography: String,
    image: String,
}));
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