mongo group tag cloud stuff

tags.js

app.get('/find/other', function(req, res) {

    var reduce = function(obj, prev) {
            obj.tags.forEach(function(tag) {
                prev.tagCounts[tag] = prev.tagCounts[tag] ? prev.tagCounts[tag] + 1 : 1;
            })
        };
        
    db.reviews.group({}, {}, {tagCounts:{}}, reduce, function(err, result) {

        // get the tags
        var tags = result[0].tagCounts,
            sorted = [],
            scale = 0;

        // sort the tags
        for (tag in tags) {
            sorted.push({
                tag: tag,
                count:tags[tag],
            });
        }

        // sort the tags
        sorted.sort(function(a, b) {
            return a.count > b.count;
        });
        
        // figure out the scale and apply it
        scale = sorted[sorted.length - 1].count;
        sorted.forEach(function(tag) {
            tag.num = (tag.count / scale).toFixed(1);
        });

        // randomize
        sorted.sort(function() {
            return 0.5 - Math.random()
        })

        // render tags page
        res.render('find/tags.html', {    
            tags: sorted
        });

    });
    
});