How to use the orchestra.models.Worker.objects.get function in orchestra

def reject_staffing_request_inquiry(request,
                                    staffing_request_inquiry_id):
    worker = Worker.objects.get(user=request.user)
    try:
        response = handle_staffing_response(
            worker, staffing_request_inquiry_id, is_available=False)
    except StaffingResponseException:
        return render(request,
                      'communication/staffing_response_not_permitted.html',
                      {})
    if response is None:
        raise Http404

    next_path = request.GET.get('next')
    if next_path:
        return HttpResponseRedirect(next_path)
    else:
        return render(request, 'communication/staffing_request_rejected.html',
                      {})

def start_timer(request):
    worker = Worker.objects.get(user=request.user)
    try:
        if request.method == 'POST':
            time_entry_data = load_encoded_json(request.body)
            assignment_id = None
            if 'assignment' in time_entry_data:
                assignment_id = time_entry_data['assignment']
            timer = time_tracking.start_timer(worker,
                                              assignment_id=assignment_id)
            serializer = TaskTimerSerializer(timer)
            return serializer.data
    except TaskAssignment.DoesNotExist:
        raise BadRequest('Worker is not assigned to this task id.')
    except TimerError as e:
        raise BadRequest(e)
    except Exception as e:
        logger.exception(e)

worker_id (int):
            The ID of the worker to be assigned.
        assignment_id (int):
            The ID of the assignment to be assigned.

    Returns:
        assignment (orchestra.models.TaskAssignment):
            The newly assigned assignment.

    Raises:
        orchestra.core.errors.TaskAssignmentError:
            The specified worker is already assigned to the given task.
        orchestra.core.errors.WorkerCertificationError:
            The specified worker is not certified for the given assignment.
    """
    worker = Worker.objects.get(id=worker_id)
    assignment = TaskAssignment.objects.get(id=assignment_id)
    if assignment.assignment_counter > 0:
        role = WorkerCertification.Role.REVIEWER
    else:
        role = WorkerCertification.Role.ENTRY_LEVEL

    if not is_worker_certified_for_task(worker, assignment.task, role):
        raise WorkerCertificationError(
            'Worker not certified for this assignment.')
    if assignment.task.is_worker_assigned(worker):
        raise TaskAssignmentError('Worker already assigned to this task.')

    assignment.worker = worker
    assignment.save()

    mark_worker_as_winner(worker, assignment.task,

def save_task_assignment(request):
    assignment_information = load_encoded_json(request.body)
    worker = Worker.objects.get(user=request.user)
    try:
        save_task(assignment_information['task_id'],
                  assignment_information['task_data'],
                  worker)
        return {}
    except Task.DoesNotExist:
        raise BadRequest('No task for given id')
    except TaskAssignmentError as e:
        raise BadRequest(e)

def _can_email(communication_type, email):
    """
        Try to get the Worker associated with the given email and query if they
        want to receive a message for the given communication_type.
    """
    try:
        worker = Worker.objects.get(user__email=email)
        comm_pref = CommunicationPreference.objects.get(
            worker=worker,
            communication_type=communication_type
        )
        return comm_pref.can_email()
    except Worker.DoesNotExist:
        return True

def perform_update(self, serializer):
        old_todo = self.get_object()
        todo = serializer.save()
        sender = Worker.objects.get(
            user=self.request.user).formatted_slack_username()

        if old_todo.completed != todo.completed:
            todo_change = 'complete' if todo.completed else 'incomplete'
        elif old_todo.skipped_datetime != todo.skipped_datetime:
            todo_change = 'not relevant' \
                if todo.skipped_datetime else 'relevant'
        else:
            # When activity_log is updated, `todo_change = None`
            # to avoid triggering any slack messages
            todo_change = None

        # To avoid Slack noise, only send updates for changed TODOs with
        # depth 0 (no parent) or 1 (no grantparent).
        if todo_change and \
                (not (todo.parent_todo and todo.parent_todo.parent_todo)):

def get_timer(request):
    worker = Worker.objects.get(user=request.user)
    try:
        if request.method == 'GET':
            timer = time_tracking.get_timer_object(worker)
            time_worked = time_tracking.get_timer_current_duration(worker)
            data = TaskTimerSerializer(timer).data
            if time_worked:
                data['time_worked'] = str(time_worked)
            return data
    except Exception as e:
        logger.error(e, exc_info=True)
        raise e

def available_staffing_requests(request):
    worker = Worker.objects.get(user=request.user)
    return render(request, 'communication/available_staffing_requests.html',
                  {
                      'requests': get_available_requests(worker),
                  })

def specified_worker(task, username, **kwargs):
    """
    Assign task to a specific person.

    Args:
        username (str):
            Username of the worker to assign.

    Returns:
        task (orchestra.models.Task): The modified task object.
    """
    worker = Worker.objects.get(user__username=username)
    return assign_task(worker.id, task.id)

def submit_task_assignment(request):
    assignment_information = load_encoded_json(request.body)
    worker = Worker.objects.get(user=request.user)
    command_type = assignment_information['command_type']

    if command_type in ('submit', 'accept'):
        iteration_status = Iteration.Status.REQUESTED_REVIEW
    elif command_type == 'reject':
        iteration_status = Iteration.Status.PROVIDED_REVIEW
    else:
        raise BadRequest('Illegal command')

    try:
        submit_task(assignment_information['task_id'],
                    assignment_information['task_data'],
                    iteration_status,
                    worker)
        return {}
    except TaskStatusError: