[BUG] When using assistant V1 Threads, Message List returns empty messages

[OscillatingMonkey]

Describe the bug

When using openAI.threads.messages.listMessage the right number of messages are returned but contain no content. Here is the implementation

  String narrative = '';
  String status = '';
  List<CreateMessageResponse> messageData = [];

  late OpenAI openAI;
  late ThreadResponse thread;
  late CreateRunResponse run;

  @override
  void initState() {
    super.initState();

    openAI = OpenAI
        .instance
        .build(token: token, baseOption: HttpSetup(receiveTimeout: const Duration(seconds: 20)),enableLog: true);

    loadNarrative();
  }

  void loadNarrative() async {
    ThreadResponse thread = await openAI.threads.createThread();
    MessageData threadMessages = await openAI
        .threads
        .messages
        .createMessage(
          threadId: thread.id,
          request: CreateMessage(
              role: "user",
              content: "Tell me about ${widget.query}"
          ));

    final request = CreateRun(assistantId: assistantId);

    CreateRunResponse run = await openAI.threads.runs.createRun(threadId: thread.id, request: request);

    setState(() {
      status = run.status;
    });

    Timer.periodic(const Duration(seconds: 15), (timer) async {
      openAI.threads.messages.listMessage(threadId: thread.id).then((res) {
        setState(() {
          messageData = res;
        });
      });
    });

    Timer.periodic(const Duration(seconds: 1), (timer) async {
      var data = await openAI.threads.runs.retrieveRun(
          threadId: thread.id,
          runId: run.id
      );

      setState(() {
        status = data.status;
      });

      if (data.status == 'completed') {
        timer.cancel();
      }
    });
  }

The message object is always empty. Please don't mind the timer on this call, to make sure there was no issue with retrieving messages too quickly I am doing an impractically long poll for them as part of debugging.

While debugging I found that when converting the response from openAI to an object, the JSON contained all of the necessary data but the mapping seemed incorrect.

I did not dig beyond this but it seems the response data is not being properly converted to a usable object and is causing messages to exist without content.

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