$this->loadDataGrid как добавить фильтр?

 
                    switch ($column['filter']){
                        case 'exact': $this->filterEqual($filter_field, $filter[$field]); break;
                        case 'like': $this->filterLike($filter_field, "%{$filter[$field]}%"); break;
                        case 'date':
							$date = date('Y-m-d', strtotime($filter[$field]));
							$this->filterLike($filter_field, "%{$date}%"); break;
                    }

case 'noexact': $this->filterNotEqual($filter_field, $filter[$field]); break;