NodeJS MVC asynchronous request - node.js

Question

I'm getting undefined data from controller to model request in NodeJS.
My Model:
const db = require('../util/database');
module.exports = class Property {
constructor(pID) {
}
getPropertyByID(pID) {
let property = {};
db.execute('SELECT * From Properties Where PropertyID = ' + pID)
.then(res => {
const data = res[0][0];
if(data){
//console.log(data); This shows DATA if I remove the comment
property = data;
}
return property;
})
.catch(err => {
console.log(err);
});
}
}
Then, in my controller I tried to use the Model method.
exports.sendDataID = (req, res, next) => {
const propID = req.params.propID;
if(propID) {
const property = new Property();
const data = property.getPropertyByID(propID);
console.log(data);
}
};
The console.log(data) is returning undefined. Why is it happening?
Thanks

Answer 1

You may use async and await function to return a promise result.
async getPropertyByID(pID) {
let property = {};
try{
var res = await db.execute('SELECT * From Properties Where PropertyID = ' + pID)
property = res[0][0]; //not sure what res variable is
return data
}catch(error){
return error
}
}
and for use this function you only need to do this:
const propID = req.params.propID;
if(propID) {
const property = new Property();
const data = await property.getPropertyByID(propID);
console.log(data);
}
I recomend you to read about promises functions: https://developer.mozilla.org/es/docs/Web/JavaScript/Referencia/Objetos_globales/Promise