1.借助self.model 处理：
from django.http import Http404
from django.core.exceptions import ObjectDoesNotExist
class TaskManager(models.Manager):
def task_depend_tree(self, *args, **kwargs):
if "id" in kwargs:
try:
task = self.get(id=kwargs["id"])
except self.model.DoesNotExist:
raise Http404
django User.objects.get()报错 raise self.model.DoesNotExist手动处理解决办法
原文：https://www.cnblogs.com/SunshineKimi/p/13830280.html