Submit Assignment via API

[d_tan]

I followed the documentation here to submit a file ...

Uploading Files - Canvas LMS REST API Documentation

The end result is a file added to the user's personal file space, and I got back a file id. I can preview the file and I can download this file.

Then I want to use this file as assignment submission for the same user, which is done by this Canvas API.

Submissions - Canvas LMS REST API Documentation

But I am getting "No valid file ids given" error when calling that API. Can someone point me on the right path?

(code is in C#)

var url = $"https://{CanvasHost}/api/v1/courses/{CanvasCourseId}/assignments/{CanvasAssignmentId}/submissions?as_user_id={CanvasUserId}";
var formData = new Dictionary<string, string>
{
  {"comment[text_comment]", "submitted via FST"},
  {"submission[submission_type]", "online_upload"},
  {"submission[file_ids]", $"{fileSubmissionResult.CanvasFileId}"}
};

[juan_londono]

Hi Douglas

Just wondering if you managed to resolve that problem - I'm having the same issue with no luck

Thanks

[pklove]

See https://community.canvaslms.com/thread/20924-submit-file-to-assignment-via-api 

[stuart_ryan]

Hi  @d_tan ,

I am wondering how you went on this and if Peter's response above was able to help you out?

Cheers,

Stuart

[d_tan · Accepted solution]

I did get it to work, my above code is almost correct, except you need to use this instead.

{"submission[file_ids][]", $"{fileSubmissionResult.CanvasFileId}"}

[stuart_ryan]

Thanks so much for letting us know Douglas, and thank you to pklove for helping out!