无法实例化mongoose架构："Object is not a function“

Question

在我的routes/index.js文件中，我有：

var mongoose = require('mongoose/');

..。

var schema = mongoose.Schema;
var user_details = new schema(
  { 
  username: String, 
  password: String
  },
  {
  collection: 'userInfo'
  });

router.post('/newuser', function(request, response, next)
  {
  var newuser = new user_details(
    {
    'username': request.params.username,
    'password': request.params.password
    });
  newuser.save();
  response.redirect('/');
  });

这给出了以下错误。48:17位置是"var newuser = new user_details(“行：

object is not a function

TypeError: object is not a function
    at module.exports (/Users/jonathan/server/routes/index.js:48:17)
    at Layer.handle [as handle_request] (/Users/jonathan/server/node_modules/express/lib/router/layer.js:82:5)
    at next (/Users/jonathan/server/node_modules/express/lib/router/route.js:110:13)
    at Route.dispatch (/Users/jonathan/server/node_modules/express/lib/router/route.js:91:3)
    at Layer.handle [as handle_request] (/Users/jonathan/server/node_modules/express/lib/router/layer.js:82:5)
    at /Users/jonathan/server/node_modules/express/lib/router/index.js:267:22
    at Function.proto.process_params (/Users/jonathan/server/node_modules/express/lib/router/index.js:321:12)
    at next (/Users/jonathan/server/node_modules/express/lib/router/index.js:261:10)
    at Function.proto.handle (/Users/jonathan/server/node_modules/express/lib/router/index.js:166:3)
    at router (/Users/jonathan/server/node_modules/express/lib/router/index.js:35:12)
    at Layer.handle [as handle_request] (/Users/jonathan/server/node_modules/express/lib/router/layer.js:82:5)
    at trim_prefix (/Users/jonathan/server/node_modules/express/lib/router/index.js:302:13)
    at /Users/jonathan/server/node_modules/express/lib/router/index.js:270:7
    at Function.proto.process_params (/Users/jonathan/server/node_modules/express/lib/router/index.js:321:12)
    at next (/Users/jonathan/server/node_modules/express/lib/router/index.js:261:10)
    at SessionStrategy.strategy.pass (/Users/jonathan/server/node_modules/passport/lib/middleware/authenticate.js:318:9)

我对“对象不是函数”的理解是，某些对象(有意地)被作为函数调用，比如{0: false, 1: true}()。但是你能解释一下我的代码中是什么触发了我的错误吗？

-更新--

我想我正在做答案的第一个评论中建议的事情。我现在得到的错误是：

/Users/jonathan/node_modules/mongoose/lib/index.js:340
      throw new mongoose.Error.OverwriteModelError(name);
            ^
OverwriteModelError: Cannot overwrite `userInfo` model once compiled.

触发代码行是：

var user = mongoose.model('userInfo', user_details);

Answer 1

由于无法实例化架构并将其用作模型，因此将触发错误。您需要首先使用mongoose.model('DocumentName', document)将其设置为a mongoose model。

例如(我复制了当前项目的一部分，所以它是ES6)：

// user.js
import mongoose from 'mongoose'

let userSchema = mongoose.Schema({
    password: String,
    username: String
})

userSchema.methods.setUp = function (username, password) {
    this.username = username
    this.password = password
    return this
}

export let User = mongoose.model('User', userSchema)
export default User

// routes.js
import { User } from './models/user'

router.post('/newuser', function (req, res) {
    new User()
    // note the `setUp` method in user.js
    .setUp(req.params.username, req.params.password)
    .save()
    // using promises; you can also pass a callback
    // `function (err, user)` to save
    .then(() => { res.redirect('/') })
    .then(null, () => /* handle error */ })
})