gistfile1.js

var async = require('async');

Folio.find().distinct('category', function(err, categories) {
	async.map(categories, function(category, callback){
			Folio.count({'category' : category}, function(err, cat) { 
				callback(err, cat)
			});
	}, function(err, results){
		if(err)
			throw new Error(err)
		res.render('portifolio', 
			{ 
				categories: results,				
				title: 'Portifolio - Lucas Simon :: Portifolio'
			}
		);
	});
});