_set(SortOrder::FIELD, $field); return $this; } /** * Set sorting direction. * * @param string $direction * @return $this */ public function setDirection($direction) { $this->_set(SortOrder::DIRECTION, $direction); return $this; } /** * @return $this */ public function setAscendingDirection() { $this->setDirection(SortOrder::SORT_ASC); return $this; } /** * @return $this */ public function setDescendingDirection() { $this->setDirection(SortOrder::SORT_DESC); return $this; } }