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public function get_winner_opros($id_opros) {
        $this->db->limit(1);
        $this->db->select('id_file, count(*) as count');
        $this->db->group_by('id_file');
        $this->db->order_by('count', 'desc');
        $this->db->where('id_opros', $id_opros);
        $files_votes = $this->db->get('files_votes');
        if ($files_votes->num_rows() <= 0) {
            return FALSE;
        }
        return $files_votes->row()->id_file;
    }