How to get data from multiple model in single controller in NodeJS? - node.js

Question

I am working on nodejs and i am using "Express js" framework, I am working on Controller and i am trying to get data from "two model functions" but i am getting message "anonymous", How can i get data from multiple "model functions", Here is my code,
This is my homeController
homeController.index = function (req, res, next) {
// fetching data into 'data variable' from FetchRecords model
homeModel.FetchRecords(function (err, data) {
if (err) {
req.flash('error', 'There was no records.');
} else {
res.render('home/index', { data: data });
}
});
homeModel.getAverage(function (average) {
console.log(average);
// res.render('home/index',{data:average});
});
};
This is my homeMOdel
homeModel.FetchRecords = function (data) {
sql.query('SELECT * FROM rating', function (err, res) {
if (err) {
return data(err, null);
} else {
return data(null, res);
}
});
};
homeModel.getAverage = function (average) {
console.log(average);
sql.query('SELECT avg(value) FROM rating', function (err, res) {
if (err) {
return average(err, null);
} else {
return average(null, res);
}
});
};

Answer 1

Inside homeModel just create 1 function instead of 2 separate. You can combine both MySQL queries into one like this.
const FetchRecordsAndAverage = function (data) {
sql.query('SELECT * FROM rating; SELECT avg(value) FROM rating', function (err, res) {
if (err) {
return data(err, null);
} else {
return data(null, res);
}
});
};
module.exports = {
FetchRecordsAndAverage
}
With this you will get combined data of both queries as arrays inside array.
Result of queries can be accessed as data[0] & data[1].

Answer 2

You should export the function from the home model:
const FetchRecords = function (data) {
sql.query('SELECT * FROM rating', function (err, res) {
if (err) {
return data(err, null);
} else {
return data(null, res);
}
});
};
const getAverage = function (average) {
console.log(average);
sql.query('SELECT avg(value) FROM rating', function (err, res) {
if (err) {
return average(err, null);
} else {
return average(null, res);
}
});
};
module.exports = {
FetchRecords,
getAverage
}
And retrieve them in your application by calling:
const { FetchRecords, getAverage } = require('./path/to/home_model');