gistfile1.js

  $scope.lookup = function() {
    var path = "api/v1/" + $scope.type + ".json";
    var businesses = Restangular.all(path);

    var filters = angular.copy($scope.filters);
    _.each(filters, function(value, index) {
      if (value instanceof Array) {
        filters[index + '[]'] = value;
        delete filters[index];
      }
    });

    businesses.getList(filters).then(function(businesses) {
      $scope.businesses = businesses;
    });
  }