MissingSchemaError: Schema hasn't been registered for model “User”

Question

In my models/user.js file:

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

var userSchema = new Schema({
    (define schema         


        

Answer 1

I got the same problem when I am trying the MEAN tutorial.

After done a little bit research, I found that in app.js, if I put require("./models/User") before var routes = require("./routes/index"), then it works.

Like this:

---

mongoose.connect("mongodb://localhost/news");
require("./models/Posts");
require("./models/Comments");

var routes = require('./routes/index');
var users = require('./routes/users');

var app = express();

---

Hope the answer will be helpful!

Answer 2

I encountered this issue when tried to add a new model on the base code of this tutorial User Auth on MEAN stack. The solution is like what Ahei mentioned.

Specifically, I need to add a line require('path/to/your/model') in the end of /app_api/models/db.js which is required in the app.js. It is better to keep the consistency of the structure for the ease of development.

Answer 3

The problem arises in the require() statements for the models. You need to move all the MongoDB dependencies above the routes dependencies like this eg

//blog.js file

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

const blogSchema = new Schema({
title : String
});

mongoose.model('blogs', blogSchema);

in server.js

//server.js file
require('dotenv').config();
const mongoose = require('mongoose');
const express = require('express');
const bodyParser = require('body-parser');
const cors = require('cors');
require('./models/blog');
const Blog = mongoose.model('blogs');

const URL = process.env.MONGO_DB_URL;
 mongoose.connect(URL, {
  useNewUrlParser: true,
  useUnifiedTopology: true,
});

mongoose.connection
.once('open', () => console.log('Connected to MongoLab instance.'))
.on('error', (error) => console.log('Error connecting to MongoLab:', error));

const app = express();

app.use(cors());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.get('/',  (req,res)=>{
res.send('Hello World')
});

 app.post('/blog',async (req, res) =>{
    const blog = await new Blog(req.body).save();
    res.send('just an example');
  });

Answer 4

This problem occurred when try to get model before load the model file load

I solved same problem in my mean.io project

In controller:

'use strict';
require('../models/settingsModel'); // load settingsModel.js file before get mongoose.model('Settings')
var mongoose = require('mongoose'),
    Settings = mongoose.model('Settings'),
    Q = require('q');

Answer 5

I tried all the above solutions but all of them failed instead I found that the solution was to clear my database (MongoDB) and then rerunning the app

Answer 6

I got this error while trying to use mongoose-fixture to seed some default data into a mongo collection. Was baffled for long, following this and similar threads for help, trying to debug. Ultimately the issue turned out to be due to mongoose and mongoose-fixture versions in my case.

If no code changes help, or if you get this error while trying to correctly use mongoose-fixture (which is supposed to register your schemas for you), try this. Delete the node_modules dir of your project, run an npm cache clean, and then an npm install.

If even this doesn't help, try comparing versions of mongoose / mongoose-fixture between the problematic app and one that works, and try changing the version in your package.json, and repeating the above steps. This worked for me.