public function searchField($field, $mode = self::SEARCH_MODE_PATTERN, $boost = 1, $phraseBoost = 1) {
		if(empty($this->data['searchFields'])) {
			$this->data['searchFields'] = array();
		}
		$this->data['searchFields'][] = array(
			'field' => $field,
			'mode' => $mode,
			'boost' => $boost,
			'phraseBoost' => $phraseBoost
		);
		return $this;
	}