Mongoose find query is not executing - node.js

Question

I am trying to fetch some data from a mongodb. I am able to fetch the details from the model MyModel (defined in Server.js). But I can't execute the find method in the model Skill (defined in Skill.js).
Server.js
let express = require('express');
let app = express();
var config = require('./config/config');
let bodyParser = require('body-parser');
var mongoose = require('mongoose');
var cors = require('cors')
var path = require("path");
let Skill = require('./app/models/Skill');
const dbURI = config.dbURI;
app.use(cors());
app.use(bodyParser.json(true));
mongoose.connect(dbURI, {useNewUrlParser: true});
mongoose.connection.on('connected', function () {
console.log("Connected");
});
var MyModel = mongoose.model('Test', new Schema({ name: String
}));
Skill.findOne(function(error, result) {
console.log("1",error,result);
});
MyModel.findOne(function(error, result) {
console.log("2",error,result);
});
app.listen(config.appPort,function () {
console.log('App running on port :: "' + config.appPort.toString() + '"');
});
app/models/Skill.js
var mongoose = require('mongoose');
var skillSchema = new mongoose.Schema({
name: String,
length: String,
});
var Skill = mongoose.model('Skill', skillSchema,'Skill');
module.exports = Skill;
Output
App running on port :: "8080"
Conneccted
2 null { _id: 5c6678215c50a65e59fc6a89, name: 'test', __v: 0 }
I haven't found any issues while creating the schema. Could someone help me to resolve the issue?

Answer 1

I can't test my suggestion at the moment, but one thing I noticed in your code is that you queries, as in
Skill.findOne(function(error, result) {
console.log("1",error,result);
});
MyModel.findOne(function(error, result) {
console.log("2",error,result);
});
are not executed in the "connected" callback; may be it's not the main problem, but I would try to change the code as follows:
mongoose.connection.on('connected', function () {
console.log("Connected");
Skill.findOne(function(error, result) {
console.log("1",error,result);
});
MyModel.findOne(function(error, result) {
console.log("2",error,result);
});
});
The key thing is that each call (.on, .findOne) starts a promise, which encapsulates an asynchronous behaviour. I you place ,findOne invocation just after .on invocation, you can't be sure Mongoose's connection is ready when you starts .findOne...