Validation failed: Hide in gradebook is not included in the list

[kreut]

Hi,

I'm getting the following error from some of my users when they try to use the API to update their assignment:

{"hide_in_gradebook":[{"attribute":"hide_in_gradebook","type":"inclusion","message":"inclusion"},{"attribute":"hide_in_gradebook","type":"inclusion","message":"inclusion"}],"invalid_record":[{"attribute":"invalid_record","type":"Validation failed: Hide in gradebook is not included in the list, Hide in gradebook is not included in the list","message":"Validation failed: Hide in gradebook is not included in the list, Hide in gradebook is not included in the list"}]}'

I'm a little confused by this since the API documentation says that this field is optional:

From the docs (https://canvas.instructure.com/doc/api/assignments.html😞

 // (Optional) If true, the assignment will not be shown in any gradebooks
  "hide_in_gradebook": true,

Regardless, I explicitly added the hide_in_gradebook key before I posted to Canvas as can be seen from my function below:

public function updateAssignment(int $course_id, int $assignment_id, $assignment_info): array
{
    $lms_access_token = $this->_updateAccessToken();
    $url = "/api/v1/courses/$course_id/assignments/$assignment_id";
    $data = [];
    if (isset($assignment_info['name'])) {
        $data['assignment[name]'] = $this->addADAPT($assignment_info['name']);
    }
    if (isset($assignment_info['instructions'])) {
        $data['assignment[description]'] = $assignment_info['instructions'];
    }
    if (isset($assignment_info['total_points'])) {
        $data['assignment[points_possible]'] = $assignment_info['total_points'];
    }

    if (isset($assignment_info['lms_assignment_group_id'])) {
        $data['assignment[assignment_group_id]'] = $assignment_info['lms_assignment_group_id'];
    }
    if (isset($assignment_info['position'])) {
        $data['assignment[position]'] = $assignment_info['position'];
    }
    if (isset($assignment_info['unlock_at'])) {
        $data['assignment[unlock_at]'] = $assignment_info['unlock_at'];
    }
    if (isset($assignment_info['due_at'])) {
        $data['assignment[due_at]'] = $assignment_info['due_at'];
    }
    if (isset($assignment_info['shown'])) {
        $data['assignment[published]'] = $assignment_info['shown'];
    }
    $data['assignment[hide_in_gradebook]'] = false;
    return $this->_doCurl($lms_access_token->access_token, 'PUT', $url, $data);
}

However, I'm still getting the error.  Any help would be appreciated.

Thank you,

Eric