toJson method
Implementation
@override
Map<String, Object?> toJson() => {
if (fileId != null) "file_id": encodeValue(fileId),
if (status != null) "status": encodeValue(status),
if (pageNumber != null) "page_number": encodeValue(pageNumber),
if (pageSize != null) "page_size": encodeValue(pageSize),
};