def perform_get_object(self):
try:
homework_id = self.request.query_params['homework']
except KeyError:
raise ValidationError()
teacher_id = get_jwt_request_uid(self.request)
try:
homework: Homework = Homework.objects.filter(
course__teacher__id=teacher_id).get(pk=homework_id)
except Homework.DoesNotExist:
raise PermissionDenied()
return homework.submits.filter(reviewed=False).first()
def _validate(self, attrs):
available_since: datetime = attrs['available_since']
deadline: datetime = attrs['deadline']
if available_since > deadline:
raise ValidationError('可用时间不能晚于截止日期！')
total_score: float = attrs['total_score']
if total_score < 0.0:
raise ValidationError('作业满分不能为负数！')
course: Course = attrs['course']
teacher_id = get_jwt_request_uid(self.context['request'])
if course.teacher.id != teacher_id:
raise ValidationError('作业的课程不是当前用户开设的课程！')
return attrs
def answer(self, request: Request, pk=None):
homework: Homework = self.get_object()
if homework.answer is None:
raise NotFound('教师未提供答案！')
now = timezone.now()
if now <= homework.deadline:
raise PermissionDenied()
student_id = get_jwt_request_uid(request)
if HomeworkSubmit.objects.filter(homework=homework, author_id=student_id).exists():
response = StreamingHttpResponse(homework.answer.file, content_type=homework.answer.mime)
response['Content-Disposition'] = f'attachment; filename={homework.answer.filename}'
return response
else:
raise PermissionDenied()
def get_queryset(self):
teacher_id = get_jwt_request_uid(self.request)
return HomeworkSubmit.objects.filter(
homework__course__teacher__id=teacher_id)
def teacher_homeworks(request: Request):
teacher_id = get_jwt_request_uid(request)
return Homework.objects.filter(course__teacher__id=teacher_id)
def get_queryset(self):
student_id = get_jwt_request_uid(self.request)
return Homework.objects.filter(course__students__id=student_id)