Attaching a Drive file to an assignment with Google Classroom API - json

Question

Using Google Apps Script I have managed to create an assignment with the following code:
Classroom.Courses.CourseWork.create({
"courseId": id,
"title" : title,
"description" : desc,
"workType" : 'ASSIGNMENT',
}, id)
This works fine, creating a draft assignment on Classroom. However, when I try to attach a Drive file like so:
Classroom.Courses.CourseWork.create({
"courseId": id,
"title" : title,
"description" : desc,
"workType" : 'ASSIGNMENT',
"materials" : [
{
"driveFile": {
"id" : fileId,
"title" : fileTitle,
"alternateLink" : fileLink,
"thumbnailUrl" : fileThumbnail,
},
"shareMode" : 'STUDENT_COPY',
}
],
}, id)
I receive these errors:
Execution failed: Invalid JSON payload received. Unknown name "share_mode" at 'course_work.materials[0]': Cannot find field.
Invalid JSON payload received. Unknown name "alternate_link" at 'course_work.materials[0].drive_file': 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.
Invalid JSON payload received. Unknown name "thumbnail_url" at 'course_work.materials[0].drive_file': Cannot find field. (line 61, file "Classroom") [1.187 seconds total runtime]
Any help will be appreciated, thank you

Answer 1

You may refer with this SO answer. This error might happen because of wrong formatting of the request.
Sample code:
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);
}
You may try this using Try this API.
Hope this helps!