public function group($group = null) {
		if ($group) {
			$this->_config['group'] = $group;
			return $this;
		}
		if ($group === false) {
			$this->_config['group'] = null;
			return $this;
		}
		return $this->_config['group'];
	}
public function group($group = null) {
		if ($group) {
			$this->_config['group'] = $group;
			return $this;
		}
		if ($group === false) {
			$this->_config['group'] = null;
			return $this;
		}
		return $this->_config['group'];
	}
public function group ( $ group = null ) { if ( $ group ) { $ this -> _config [ 'group' ] = $ group ; return $ this ; } if ( $ group === false ) { $ this -> _config [ 'group' ] = null ; return $ this ; } return $ this -> _config [ 'group' ] ; }
Set and get method for the `Query` group config setting.

@param string|array|null $group
@return array|null|\lithium\data\Query
Set and get method for the Query group config setting .