Multi instance setup for sequelize

app.js

var dbAdmin = require('./db/admin.js');
var dbNormal = require('./db/normal.js');
var dbSomethingElse = require('./db/something-else.js');

db-admin.js

var configForAdmin = { database: 'localhost', username: 'admin-user', password: 'admin-password' };
// This config could also be read from a config file!
module.exports = require('../models/index')(configForAdmin);

db-normal.js

var configForNormalUser = { database: 'localhost', username: 'normal-user', password: 'normal-password' };
// This config could also be read from a config file!
module.exports = require('../models/index')(configForNormalUser);

db-something-else.js

var configForSomethingElse = { database: 'localhost', username: 'some-other-user', password: 'some-other-password' };
// This config could also be read from a config file!
module.exports = require('../models/index')(configForSomethingElse);

models-index.js

"use strict";

var fs        = require("fs");
var path      = require("path");
var Sequelize = require("sequelize");

module.exports = function(config) {
  var sequelize = new Sequelize(config.database, config.username, config.password, config);
  var db        = {};
  
  fs
    .readdirSync(__dirname)
    .filter(function(file) {
      return (file.indexOf(".") !== 0) && (file !== "index.js");
    })
    .forEach(function(file) {
      var model = sequelize["import"](path.join(__dirname, file));
      db[model.name] = model;
    });
  
  Object.keys(db).forEach(function(modelName) {
    if ("associate" in db[modelName]) {
      db[modelName].associate(db);
    }
  });
  
  db.sequelize = sequelize;
  db.Sequelize = Sequelize;
  
  return db;
};

models-user.js

"use strict";

module.exports = function(sequelize, DataTypes) {
  var User = sequelize.define("User", {
    username: DataTypes.STRING
  }, {
    classMethods: {
      associate: function(models) {
        User.hasMany(models.Task)
      }
    }
  });

  return User;
};