/**
* Adds a filter on the instance of the searchnode.
*
* @param string $filter The fieldname you want to filter OR a SQL where
* clause expression.
* @param string $value Required value. (Ommit this parameter if you pass
* an SQL expression for $filter.)
*/
public function addSearchFilter($filter, $value = '')
{
if (!$this->m_searchnodeInstance) {
$this->createSearchNodeInstance();
}
$this->m_searchnodeInstance->addFilter($filter, $value);
}
