/**
  * @param Mana_Db_Model_Formula_Closure $closure
  * @return mixed
  */
 public function each($closure)
 {
     $closure->setAlias($this);
     $result = array();
     foreach ($this->getAliases() as $index => $alias) {
         $result[$index] = $closure->setIndex($index)->execute();
     }
     return $result;
 }
 /**
  * @param Mana_Db_Model_Formula_Closure $closure
  * @return mixed
  */
 public function each($closure)
 {
     return $closure->setIndex(null)->setAlias($this)->execute();
 }