Django: Create an instance of Manager with a copy of a custom QuerySet

Sometimes we want to query by custom filter and different orders

1	Product.objects.filter(name__contains='Dog').origin_filter('台灣')

And in this case will raise AttributeError because Queryset object can not call Manager method

Solution: as_manager()

class ProductQuerySet(QuerySet):

def origin_filter(self, name):

name = name.replace('台', '臺')

return self.filter(origin=name)

class Product(Model):

objects = ProductQuerySet.as_manager()