Display Mongoose find in express

Being new to MongoDB and Mongoose, I feel really lost here.

After trying soooo many ways, I'm stuck with this: I can't figure out how Mongoose actually works, I went back to original state for clearer code reading, my tryouts are crashing node.JS.

I have this in the app.js that works:

PolyModel.find(null, function (err, poly) {
  if (err) { throw err; }
  console.log(poly);
});

Console shows good results in the shell, using a nice JSON format.

This line sends everything to the router

app.use('/', index);

My router:

var express = require('express');
var router = express.Router();

router.get('/', function(req, res, next) {
    res.render('index', { title: 'Polygon grid', author: 'Author'});
});

module.exports = router;

My main question is: how do I get this poly value in the router / views?

I've red so much stuff and would like to learn the proper practices.

For information, my final goal would be to get this value into an Angular ng-repeat.

via Sunkhern