Import var into matches.ejs

JavaScript
1

Hello guys im a bit stuck in project. I’m trying to import my var results into matches.ejs

Here is a function I received some help to create

matches.js

module.exports = {
  getCustomers: function(callback) {
    var MongoClient = require('mongodb').MongoClient;
    var url = "mongodb://127.0.0.1:27017/test";

    MongoClient.connect(url, function(err, db) {
      if (err) throw err;
      var dbo = db.db("mydb");
      dbo.collection("customers").find({}).toArray(function(err, result) {
        if (err) throw err;
        db.close();
        callback(result);
      });
    });
    }
    };

And testing it in console.log works

var db = require('./app/settings');
db.getCustomers(function(results) {
  console.log("customers", results);
 });

However in my routes.js file I would Like this var to be imported when it renders matches.ejs

I have tried like so:

app.get('/profile', isLoggedIn, function(req, res) {
	res.render('pages/matches.ejs', {
	  result: db.getCustomers(results)
	});
});

But does not work any suggestion as how I can pass the var over to matches.ejs would be much appreciated’’

2

Hi @frederikwalle,

Judging by this and your other, similar thread, I’m guessing you’re not fully familiar with synchronous vs asynchronous code.

In your route, you’re treating db.getCustomers() as a synchronous operation - i.e. you’re expecting it to return a result before the rest of the code executes. However, the MongoDB client methods are asynchronous - when you call them, JS doesn’t wait for them to finish before moving on, which is why you have to provide a callback function (there are also other ways of dealing with async code).

You’ve got this right in your console.log() test - you just need to apply this to your route function.

3

thanks for your reply and insight into my misconception with synchronous vs asynchronous code. I did find this excelent articel here: https://www.pluralsight.com/guides/front-end-javascript/introduction-to-asynchronous-javascript

which have given me a bettor grasp of things but still I have a lot to learn.

“You’ve got this right in your console.log() test - you just need to apply this to your route function.”

  • I know I have it right here but i’m actually clueless as how to add/rewrite this to work my routes routine, hence my cry for help here. I was hoping for a sample if you don’t mind .

  • I have tried a few different approaches but with my skill level i really need some help :slight_smile:

Frederik

4 
app.get('/profile', isLoggedIn, function(req, res) {
  db.getCustomers(function(results) {
    res.render('pages/matches.ejs', {
      result: results;
    })
  });
});

Note that you’ll need to add some error checking, but that’s the general idea.

5

phew this was very close to some of earlier tests today. Much appreciated sir

Ill look forward to test this…

frederik

6

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