CODEWITHSUNDEEP
node.jsmongodbmongoose
Lars Holdgaard
Lars Holdgaard

Reputation: 9986

Mongoose and new Schema: returns "ReferenceError: Schema is not defined"

I am creating a new sample application, where I try to connect to a MongoDB database through Mongoose.

I create a new schema in my service.js file, but I get the following error when I run nodemon app.js: "ReferenceError: Schema is not defined"

App.js code:

var http = require('http');
var express = require('express');
var serials = require('./service');
var app = express();
var mongoose = require('mongoose');


var port = 4000;
app.listen(port);

mongoose.connect('mongodb://localhost:27017/serialnumbers')

app.get('/api/serials',function(req,res){
    serials.getSerial(req, res, function(err, data) {
        res.send(data);
    });
});

Service.js code:

var mongoose = require('mongoose');

var serialSchema = new Schema({
    serial: {type: String},
    game: {type: String},
    date: {type: Date, default: Date.now},
});
mongoose.model('serials', serialSchema);

exports.getSerial = function(req,res,cb) {
    mongoose.model('serials').find(function(err,data) {
        cb(err,data);
    });
};

I saw an answer here on StackOverflow that referenced it could be the version of Mongoose. But npm list gives me this:

enter image description here

Any idea what I am doing wrong?

Upvotes: 18

Views: 43655

Answers (7)

Tere Villalba
Tere Villalba

Reputation: 91

Define Schema like this on your second line:

var Schema = mongoose.Schema

Upvotes: 9

jsgagne
jsgagne

Reputation: 21

const { Schema } = mongoose;

From: https://mongoosejs.com/docs/guide.html#definition

Upvotes: 2

iSteven Zion
iSteven Zion

Reputation: 124

Between your var mongoose = require('mongoose'); and var serialSchema = new Schema({ Add Const Schema= mongoose.Schema

That defines the schema and solves the problem

Upvotes: -1

Greg Alpha
Greg Alpha

Reputation: 31

In my case, I was referencing a schema inside of another schema and had to replace type: Schema.Types.ObjectId with mongoose.Types.ObjectId.

Upvotes: 1

Hasan Zahran
Hasan Zahran

Reputation: 1452

In you case call as mongoose.Schema as you did not defined it as

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

Upvotes: 0

Aravinda Meewalaarachchi
Aravinda Meewalaarachchi

Reputation: 2639

This can be occurred due to several reasons. first one is that you might forgotten to import Schema.You can fix that as follows.

const Schema = mongoose.Schema;

const serialSchema = new Schema({
   serial: {type: String},
   game: {type: String},
   date: {type: Date, default: Date.now},
});

Sometimes you have forgotten to import your newly created model.This type of errors can be solve by importing created model to your working file. 

const serialModel = mongoose.model('serials', serialSchema);

Upvotes: 5

anvarik
anvarik

Reputation: 6487

Exactly, in your Service.js, what is Schema? You don't have an object named Schema.

...
var serialSchema = new Schema({
                       ^^^^^^

change it to mongoose.Schema then it will be fine.

Upvotes: 37

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