How could I bind `save` method using `Q` with mongoose - node.js

Question

Saying that I have the following schema in User.js
var mongoose = require('mongoose');
var Q = require('q');
var userSchema = new mongoose.Schema({
phone: {
type: Number,
require: true,
index: {
unique: true
}
}
});
module.exports = mongoose.model('User', userSchema);
module.exports.findOne = Q.nfbind(module.exports.findOne.bind(module.exports));
module.exports.find = Q.nfbind(module.exports.find.bind(module.exports));
And another file testuser.js
var mongoose = require('mongoose');
var Q = require('q');
var User = require('../User');
var connectionStr = "mongodb://localhost:27017/user-model-test";
mongoose.connect(connectionStr, function(error) {
if (error) {
throw(error);
}
console.log("Connect to MongoDB...");
var testuser = new User({
phone: [phone],
});
testuser.save = Q.nfbind(testuser.save.bind(testuser));
testuser.save().then(function () {
return User.findOne({ phone: [phone] }).then(function (user) {
console.log(user.phone);
mongoose.disconnect();
}, function (error) {
throw(error);
});
}, function (error) {
throw(error);
}).done();
});
Notice that currently I use testuser.save = Q.nfbind(testuser.save.bind(testuser)); to bind the save, but I want to do it in User.js, like module.exports.find = Q.nfbind(module.exports.find.bind(module.exports));, is there any way that I could do that?
Thank you.

Answer 1

If you insist on Q, I'd do something like:
User.create = function(data){
var u = new User(data);
u.save = Q.nfbind(testuser.save.bind(testuser));
// add other methods you want
return u;
};
However, I'd like to add that all other Mongoose methods already return a promise if you call .exec() on them (so .find(..).exec() returns an mpromise promise). That is, Mongoose already provides a promise API, save is one of the only methods that are not included yet and there are plans to include it.
It's also beneficial to know that this becomes a one liner with Bluebird, which has a promisifyAll function that creates promises that are easier to debug and are faster than Qs or Mongoose's.