queryset.update() on custom manager ignores all filter

[flytwokites]

model:

class Party(models.Model):
    name = models.CharField(max_length=50)
    is_company = models.BooleanField()

class CompanyManager(models.Manager):

    def get_query_set(self):
        return super(CompanyManager, self).get_query_set().filter(is_company=True)

class Company(Party):
    objects = CompanyManager()
    class Meta:
        proxy = True

show bug:

>>> Company.objects.create(name='GlideTools')
>>> Company.objects.filter(name='M$')
[]
>>> Company.objects.filter(name='M$').update(name='What?!')
1
>>> [p.name for p in Party.objects.all()]
[u'What?!']

The update() updates all objects, All filters on it is ignored!

[Karen Tracey]

This is a dupe of #12247.

[Jacob]

Milestone 1.2 deleted