关于python:django执行向后关系查询时发生最大递归深度超出错误，当我使用manager时

Django executing backward relation query occurred a maximum recursion depth exceeded error when I use Manager

代码如下：

类源

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class CarSource(models.Model):
status = models.CharField(max_length=1, blank=True, null=True)
dealer = models.ForeignKey(Dealer, blank=True, null=True, \
on_delete=models.SET_NULL, related_name='cars', \
verbose_name=u'dealer own this car')
objects = CarSourceManager()

班商

1 2	class Dealer(models.Model): ...

类carsourceManager:

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class CarSourceManager(models.Manager):
''' Manage query in CarSource, filter data that was processed successfully.'''
def get_query_set(self):
return super(self.__class__, self).get_query_set().filter(status='S')

当我执行此操作时：

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from ... import Dealer
d = Dealer.objects.get(id = 2)
d.cars.all()

出现以下错误：

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File"/...path..of..error..file../apps/car/managers.py", line 9, in all
return super(self.__class__, self).all().filter(status='S')
File"/...path..of..error..file../apps/car/managers.py", line 9, in all
return super(self.__class__, self).all().filter(status='S')
File"/...path..of..error..file../apps/car/managers.py", line 9, in all
return super(self.__class__, self).all().filter(status='S')
File"/...path..of..error..file../apps/car/managers.py", line 9, in all
return super(self.__class__, self).all().filter(status='S')
File"/...path..of..error..file../apps/car/managers.py", line 9, in all
return super(self.__class__, self).all().filter(status='S')
File"/...path..of..error..file../apps/car/managers.py", line 9, in all
return super(self.__class__, self).all().filter(status='S')
File"/...path..of..error..file../apps/car/managers.py", line 9, in all
return super(self.__class__, self).all().filter(status='S')
RuntimeError: maximum recursion depth exceeded while calling a Python object

我重写了CarSourceManager中models.Manager的get_query_set，显然，它继续自递归地称之为models.Manager。我看了经理的代码，但没弄清楚，请帮帮我。