Invalid JSON payload received error when creating assignment

Question

I'm using Google Apps Scripts to create assignments with an uploaded document for a classroom. However, there's an error.

Execution failed: Invalid JSON payload received. Unknown name "share_mode" at 'course_work.materials[0]': Cannot find field. Invalid JSON payload received. Unknown name "id" at 'course_work.materials[0].drive_file': Cannot find field. Invalid JSON payload received. Unknown name "title" at 'course_work.materials[0].drive_file': Cannot find field. (line 2, file "TEST") [0.061 seconds total runtime]

Here's my code. I know the error is in materials but I'm not sure what I did wrongly.

function myFunction() {
  var exec = Classroom.Courses.CourseWork.create({
    title: "Test File",
    state: "DRAFT",
    materials: [
      {
        driveFile: {id: "1ENk55RMtApIydyPFe0uyuhmu6nSV4", title: "Test File"},
        shareMode: "STUDENT_COPY"
      }
      ],
    workType: "ASSIGNMENT"
  }, "3896298178");
  Logger.log(exec);
}

Answer 1

Found out the root of your issue. I've updated your codes to make it work.

Request:

function myFunction() {
  var ClassSource =  {
    title: "Test File",
    state: "DRAFT",
    materials: [
      {
        driveFile:{
        driveFile: {
          id: "fileID", 
          title: "Sample Document"

        },
        shareMode: "STUDENT_COPY"
        }

      }
      ],
    workType: "ASSIGNMENT"
  };

  Classroom.Courses.CourseWork.create(ClassSource, COURSEID)
  //Logger.log(exec);
}

Result:

We receive Invalid JSON payload received. because the formating of the request is wrong. Its a little bit more complicated than I thought, that is why I tried using Try this API to see the request format and it really helped me solve your issue.

Hope this helps.