WindSaber

angular.module('caco.feed.filter', [])
    .filter('sumByKey', function() {
        return function(data, key) {
            if (typeof(data) === 'undefined' || typeof(key) === 'undefined') {
                return 0;
            }

            var sum = 0;
            angular.forEach(data, function(obj, objKey){
                sum+= parseFloat(obj[key]);