/**
  * {@inheritDoc}
  */
 public function load(ConfigProxy $config)
 {
     $result = $this->_qbFactory->getQueryBuilder()->select($this->_columns)->from('refer_a_friend_reward_trigger')->where('reward_config_id = :id?i', ['id' => $config->getID()])->getQuery()->run();
     $triggers = new Collection();
     foreach ($result as $row) {
         $triggers->add($this->_triggers->get($row->name));
     }
     return $triggers;
 }