question: how to handle multipart file upload about graphql_codegen HOT 4 CLOSED

targets:
  $default:
    builders:
      json_serializable:
        options:
          include_if_null: false
      graphql_codegen:
        options:
          includeIfNullOnInput: false
          clients:
            - graphql
          scalars:
            DateTime:
              type: DateTime
              fromJsonFunctionName: dateTimeFromJson
              toJsonFunctionName: dateTimeToJson
              import: package:yourapp/scalars.dart
            JSON:
              type: Map<String, dynamic>
            Upload:
              type: MultipartFile
              fromJsonFunctionName: fileFromJson
              toJsonFunctionName: fileToJson
              import: package:yourapp/scalars.dart

import "package:http/http.dart";
export "package:http/http.dart";

String dateTimeToJson(DateTime data) {
  return data.toIso8601String();
}

DateTime dateTimeFromJson(dynamic data) {
  return DateTime.parse(data);
}

MultipartFile fileFromJson(dynamic data) {
  return data as MultipartFile;
}

dynamic fileToJson(MultipartFile data) {
  return data;
}

Future<bool> uploadImage(String fileNameId) async {
  final ImagePicker _picker = ImagePicker();
  final XFile? image = await _picker.pickImage(source: ImageSource.gallery);
  if (image == null) return false;
  print(image.path);

  var result = await _client.mutateUploadUserFile(
    OptionsMutationUploadUserFile(
      variables: VariablesMutationUploadUserFile(
        file: MultipartFile.fromBytes(
          "",
          await image.readAsBytes(),
          filename: fileNameId,
          contentType: MediaType.parse(lookupMimeType(image.path)!),
        ),
      ),
    ),
  );
  if (result.hasException) {
    print(result.exception.toString());
    await Sentry.captureException(result.exception);
    return false;
  }
  print(result.parsedData!.toJson());
  return true;
}

"""The `Upload` scalar type represents a file upload."""
scalar Upload

type Mutation {
  uploadUserFile(file: Upload!): Resource!
  uploadUserMultipleFiles(files: [Upload!]!): [Resource!]!
}

mutation uploadUserFile($file: Upload!){
    uploadUserFile(file: $file){
        filename
        id
        mimetype
        type
        url
    }
}