public function getRangeOnCollection($collection) { $min = 0; $stats = $collection->getStats($this->_getFilterField()); $max = $stats[$this->_getFilterField()]['max']; if (!is_numeric($max)) { return parent::getRangeOnCollection($collection); } else { $max = $this->_ceil($max * $this->getCurrencyRate()); } return compact('min', 'max'); }