/**
* @param string $column_name
* @param string $value
* @param boolean $equal
*
* @return FilterInterface
*/
public function findBy($column_name, $value, $equal = true)
{
$source = $this->getSourceM($column_name);
$this->filter->addWhere(array('source' => $source, 'field' => $column_name, 'value' => $value, 'equal' => $equal));
return $this;
}
