Documentation not clear about uploading file

[thedarkknight197]

I need upload file using graphql_mutation. I am also using dio package on my app.

https://github.com/zino-hofmann/graphql-flutter/blob/main/packages/graphql/README.md#graphql-upload

How can i put inside variable a file? I tried with file directly and not work.

I tried also with MultipartFile but nothing:

final result = runMutation({
  "content": text,
  "chatroomId": chatRoomId,
  "attachment": viewModel.attachment.isFileSet()
      ? await MultipartFile.fromFile(
          viewModel.attachment.file!.path,
          filename: viewModel.attachment.file!.path
              .split("/")
              .last)
      : null
});

The reuqest not arrive to my server.

Using talen api request to my graphql endpoint with

{
  "query":"mutation ($chatroomId: Float!, $content: String, $attachment: Upload ) {\n          sendMessage (\n              chatroomId: $chatroomId,\n              content: $content\n, attachment: $attachment\n          ) {\n              attachment {\n                  id\n                  path\n              }\n              chatRoomId\n              content\n              createdAt\n              id\n              userId\n          }\n        }",
  "variables": {
    "chatroomId":2,
    "content": "ciao",
    "attachment": ""
  }
}

the call was blocked by Upload validator, but it arrive...

So i need explaination about how send file using your library to my server.

Thank you for your support

(without attachment request work)

[thedarkknight197]

Now I did some changes the body arrive, but i have a new issue:

[Nest] 31308  - 30/01/2024, 12:46:47   ERROR [ExceptionsHandler] Missing multipart field ‘operations’ (https://github.com/jaydenseric/graphql-multipart-request-spec).
BadRequestError: Missing multipart field ‘operations’ (https://github.com/jaydenseric/graphql-multipart-request-spec)

the body that arrive to my backend is:

 body: {
    operationName: null,
    variables: { content: '', chatroomId: 2, attachment: [Upload] },
    query: 'mutation($chatroomId: Float!, $content: String, $attachment: Upload) {\n' +
      '  __typename\n' +
      '  sendMessage(chatroomId: $chatroomId, content: $content, attachment: $attachment) {\n' +
      '    __typename\n' +
      '    attachment {\n' +
      '      __typename\n' +
      '      id\n' +
      '      path\n' +
      '    }\n' +
      '    chatRoomId\n' +
      '    content\n' +
      '    createdAt\n' +
      '    id\n' +
      '    userId\n' +
      '  }\n' +
      '}'
  },