Find not working with mongoose 4.6.* - node.js

Question

Using mongoose if I try to find a document stored in the database using db.model() like mongoose docs suggests, I get no results :(
However, if I use db.collection().find() I get results.
Why is that? and what will be the best approach using the example code below?
In app.js
var mongoose = require('mongoose');
mongoose.Promise = global.Promise;
mongoose.connect(config.database.url); // database configuration
app.locals.db = mongoose.connection;
app.locals.db.on('error', function(msg){
console.log("db connection failed", msg);
});
app.locals.db.once('open', function(){
console.log("db connected successfully");
});
In routes -> person.js
var Person = require('Person');
router.post('/search', function(req, res) {
var person = new Person(req.app.locals.db);
person.getPerson(req.body.name, function(found, docs) {
if (found === false)
res.render('pageTpl', { results: 'person not found' });
else
res.render('pageTpl', { results: docs });
});
In Person.js
// schema here returns new mongoose.Schema({ fields : types })
const personSchema = require('./schemas/personSchema');
function Person(db) {
this.db = db;
}
Person.prototype.getPerson = function(term, callback) {
var Person = this.db.model('people', personSchema);
var q = Person.find({ name: /^term/ }).sort('age').limit(2);
q.exec(function(err, results) {
if (err) return callback (false, err);
// This returns [] results
console.log(results);
callback(true, results);
});
});
module.exports = Person;

Answer 1

The problem is with this line: var Person = this.db.model('people', personSchema);
Mongoose automagically converts model to plural so try the following: var Person = this.db.model('person', personSchema);

Answer 2

After some more research I figure out why I was not getting results. It all fall into the details. In Person.js I have the following line:
var q = Person.find({ name: /^term/ }).sort('age').limit(2);
If you look closely, the problem resides in here /^term/ where term in a variable but does not get translate into its value. Instead I did:
var regTerm = new RegExp("^" + term);
Now, regTerm can be used as regular expession within find.
Hope this helps someone in the future.