angular.module('MyApp')
  .filter('campaignFilter', function(){
    return function(options, client_ids) {
      if (client_ids == null) {
        return options;
      } else {
        filtered = [];

        angular.forEach(options, function(option){
          if (client_ids.indexOf(option.client_id) > -1) {
            filtered.push(option);
          };
        });

        return filtered;
      }
    }
  });