public function prepareSearchParam() {
        if (isset($this->request['searchFields']) and ! empty($this->request['searchFields'])) {
            $returnSearch = Array();
            $countSearchFields = 0;

            foreach ($this->request['searchFields'] as $key => $value) {
                $returnSearch[$countSearchFields]['indexColumn'] = $key;
                $returnSearch[$countSearchFields]['valueColumn'] = $value;
                $countSearchFields++;
            }
            return $returnSearch;
        } else {
            return null;
        }
    }