Get Student ID from submission metadata

[emilioapontea]

I am working on an autograder inherited from a previous semester of a course. This autograder script worked in the past, but we are running into some issues with obtaining the submission metadata through the autograder/submission_metadata.json file. I have confirmed that most of the metadata information is correct, except for the metadata['users'][0]['sid'] value. This is an individual assignment so the metadata['users'] list contains a single student dictionary, although I imagine the error is not related to the number of students in the list. Even though I cannot find a reference to this dictionary key in the documentation, I have confirmed that the student dictionary does contain the ['sid'] key, but is always paired with the value None. The autograder is supposed to obtain the student's campus ID from the metadata, and the Gradescope course roster is configured with student IDs. Is there a way to obtain the student's student ID from the submission metadata file?

[mattrussell2]

From the documentation, the users field of the metadata.json file looks like this:

"users": [
    {
      "email": "student@example.com",
      "id": 1234,
      "name": "Student User"
    }, ... // Multiple users will be listed in the case of group submissions
  ],

There is no sid field, however there is an id field. Assuming that your students were working individually, then you will be able to access

metadata['users'][0]['id']     # student's id
metadata['users'][0]['name']   # student's name
metadata['users'][0]['email']  # student's email

[adam-brucker]

Do you use an LMS? I've seen it in the past where Canvas does not send that value over.