public function getAvailableValues($query = '')
    {
        $dataRequest = new DataRequest(0, 0, $this->fieldName, 'ASC');
        
        if ($query != '') {
            $dataRequest->addFilter(new Filter($this->fieldName, '*' . $query . '*', 'LIKE'));
        }
        
        $values = $this->dataSourceManager->find($dataRequest);
        
        return $values;
    }