Augment Mongoose with Q promises. In some cases the method is an alternative to an existing promise-returning methods, like `qexec` vs. Mongoose's native `exec`. In other cases it's providing an operation that Mongoose doesn't give promises for, such as `qsave` and `qcreate`.

gistfile1.txt

var mongoose = require('mongoose');

// Workaround for the fact that chai-as-promised isn't working with Mongoose promises:
// https://github.com/domenic/chai-as-promised/issues/30
mongoose.Query.prototype.qexec = function () {
  return Q.npost(this, 'exec', arguments);
}

mongoose.Model.qcreate = function () {
  return Q.npost(this, 'create', arguments);
}

mongoose.Model.prototype.qsave = function () {
  var deferred = Q.defer();
  this.save(function (err, model) {
    if (err) deferred.reject(err);
    else deferred.resolve(model);
  });
  return deferred.promise;
}

mongoose.Model.prototype.qreload = function () {
  return this.model(this.constructor.modelName).findById(this.id).qexec();
}