public function filterByHasghostblocks($hasghostblocks = null, $comparison = null)
    {
        if (is_string($hasghostblocks)) {
            $hasghostblocks = in_array(strtolower($hasghostblocks), array('false', 'off', '-', 'no', 'n', '0', '')) ? false : true;
        }

        return $this->addUsingAlias(MxmapTableMap::COL_HASGHOSTBLOCKS, $hasghostblocks, $comparison);
    }