gistfile1.js

// user model

module.exports  = function (user) {
  // new user with 'user'

  this.save = function() {
    // save 'user'
  };
};

module.exports.get = function (id) {
  // query users by id
};

/************************************/

// user controller

var User = require('../models/users');

module.exports.index = function (req, res, next) {
  var user = new User('test');
  user.save();
};

module.exports.get = function (req, res, next) {
  User.get(req.params.uid);
};