关于python：Model在Manager中没有属性“DoesNotExists”

Model has no attribute 'DoesNotExists' in Manager

Django 1.7 Exceptions documentation exceptions.

The DoesNotExist exception is raised when an object is not found for
the given parameters of a query. Django provides a DoesNotExist
exception as an attribute of each model class to identify the class of
object that could not be found and to allow you to catch a particular
model class with try/except.

基于上面的文献，我创建了自定义模型经理：

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class CountryManager(models.Manager):
def get_special(self, *args, **kwargs):
kwargs.update({'country': settings.ACTIVE_COUNTRY})
try:
return self.get(*args, **kwargs)
except self.model.DoesNotExists:
self.logger.warning('Unable to find specific object using filter {}'.format(kwargs))
kwargs.update({'country': settings.DEFAULT_COUNTRY})
return self.get(*args, **kwargs)

注：以{'country': settings.ACTIVE_COUNTRY}和WIT{'country': settings.DEFAULT_COUNTRY}为例，简化了Lines with {'country': settings.ACTIVE_COUNTRY}and WIT{'country': settings.DEFAULT_COUNTRY}

ZZU1

当我试着

1	Product.objects.get_special(name='abc')

我会跟踪错误

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/opt/src/common/managers.py in get_special(self, *args, **kwargs)
40 try:
41 return self.get(*args, **kwargs)
---> 42 except self.model.DoesNotExists:
43 self.logger.warning('Unable to find specific object using filter {}'.format(kwargs))
AttributeError: type object 'Product' has no attribute 'DoesNotExists'