nodejs mongodb , getting no result from db

Question

Issue with working on data from MongoDb

Connecting to MongoDb successfully ,

but on find command , it should return an empty collection , yet nothing is returned.

what could be the issue , or how it could be monitored by some error messaging.

Thanks.

Project dependencies

"dependencies": {
"body-parser": "^1.19.0",
"epxress": "0.0.1-security",
"express": "^4.17.1",
"nodemon": "^2.0.2"

}

mongoose.js

const mongoose = require('mongoose');

mongoose.Promise = global.Promise;
mongoose.connect('mongodb://localhost:27017/ListsDB', { useNewUrlParser: true, useUnifiedTopology: true}).then( ()=> {
    console.log("Connected to MongoDbB successfully ");
}).catch( (e) => {
    console.log("Error while attempting to connect to MongoDB");
    console.log(e);
});

mongoose.set('useCreateIndex', true);
mongoose.set('useFindAndModify', false);

module.exports = {
    mongoose
};

list.model.js

const mongoose = require('mongoose');

const ListSchema = new mongoose.Schema({
   title: {
       type: String,
       required: true,
       minlength: 1,
       trim: true
   }
})

const List = mongoose.model('List', ListSchema);

module.exports = { List }

app.js Not Working

const express = require('express');
const app = express();

const bodyParser = require('body-parser');

const { List, Task } = require('./db/models');

app.use(bodyParser.json());

app.use(function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*"); // update to match the domain you will make the request from
    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
    next()
  })

app.get('/lists', (req,res) => {
    // We want to return an array of all the lists in the database
    List.find({}).then( (err, lists)=> {
        res.send(lists)
    })
})

app.listen(3000, () => {
    console.log("Server is listening on port 3000");
})

Have you imported the list in app.js ? Have you checked your console errors ? — Juhil Somaiya
– Juhil Somaiya, Commented Feb 27, 2020 at 11:19
@Juhil Somaiya yes it is , also the err not returning anything, is suspect its mongo issue , but dont know how to monitor it. — Shl
– Shl, Commented Feb 27, 2020 at 11:39

Y. D. · Accepted Answer · 2020-02-27 11:21:00Z

1

Try using this syntax

   app.get('/lists', (req,res) => {
     List.find({}).then( lists => {
        res.send(lists)
     }).catch(err =>
        console.log(err)
     );
   })

answered Feb 27, 2020 at 11:21

Y. D.

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2 Comments

Juhil Somaiya Over a year ago

Are you seeing List imported in app.js ? How it will get List ?

Shl Over a year ago

@JuhilSomaiya yes.

Hardik Patel · Accepted Answer · 2020-02-27 12:03:30Z

0

You are passing multiple argument in then block. Then is only accept single argument that is mark as success data. If you want to show errors also you have to pass in error argument in catch block.

Try This code :

    const express = require('express');
    const bodyParser = require('body-parser');
    const List = require('./listModel');
    const mongoConnection = require('./mongoose');
    const app = express();

app.use(bodyParser.json({
    limit: '20mb',
    extended: true
}));
app.use(bodyParser.urlencoded({
    extended: true
}));

app.get('/lists', (req,res) => {
     List.find().then( lists => {
                res.send(lists)
          }).catch(err =>
                res.send(err)
          );
 });

app.listen(3100, () => {
    console.log("Server is listening on port 3100");
})

edited Feb 27, 2020 at 12:03

answered Feb 27, 2020 at 11:38

Hardik Patel

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9 Comments

Hardik Patel Over a year ago

I have tried out your code which is working fine with this solution.

Juhil Somaiya Over a year ago

There might be issue with his local mongodb @HardikPatel

Shl Over a year ago

it seem like it is a mongo issue indeed , any ideas how to verify/find issue

Hardik Patel Over a year ago

first of all make sure that you have mongoDB installed on your system as well as if installed then check that it is connected to your application.

Hardik Patel Over a year ago

i think you have not connected your mongoDB in your app. add following line in your app.js file const mongo = require('path to mongoconnection file');

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