async loading module

async-module.js

var path = require('path');
var mongoose = require('mongoose');
var when = require('when');
var whenNode = require('when/node');
var glob = whenNode.lift(require('glob'));
var config = require('./config');

// exports a 'done' promise
var done = when.defer();
module.exports = done.promise;

// open db
var url = config.get('mongoUrl');
mongoose.connect(url);

// find db-ready
var dbReady = when.defer();
mongoose.connection.once('open', dbReady.resolve.bind(dbReady));

// read all files in the /schema subdir
var schemaPath = path.join(__dirname + '/schema/*.js');
var dirRead = glob(schemaPath);

// when everything ready,
// load all the schema files into mongoose
var schemas = when.all([dirRead, dbReady]).then(function(val){
	var rv = {}
	var schemaFiles = val[0];
	// load each schema, install into mongoose, and export it here.
	schemaFiles.forEach(function(schemaFile){
		// get the schema
		var modelModule = require(schemaFile);
		// load the schema in mongoose
		var modelName = schemaFile.charAt(0).toUpperCase() + schemaFile.substring(1);
		var model = mongoose.model(modelName, modelModule);
		// export the schema
		rv[modelName] = module.exports[modelName] = model;
	});
	// return a second, non-promise copy of the schemas
	return rv
})

// resolve done when schemas have all loaded
schemas.then(function(schemas){
	done.resolve(schemas);
});