Hi,

I'm trying to delete all entries in a model. However, when I attempt
to do so by calling `Comment.objects.all().delete()`, I get an error
saying `AttributeError: 'ReverseSingleRelatedObjectDescriptor' object
has no attribute 'delete_manager'`. What am I doing wrong?

Full stacktrace:

>>> Comment.objects.all().delete()
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/home/jeff/.virtualenvs/osl_main-website/lib/python2.6/site-
packages/django/db/models/query.py", line 441, in delete
    obj._collect_sub_objects(seen_objs)
  File "/home/jeff/.virtualenvs/osl_main-website/lib/python2.6/site-
packages/django/db/models/base.py", line 569, in _collect_sub_objects
    sub_obj._collect_sub_objects(seen_objs, self, related.field.null)
  File "/home/jeff/.virtualenvs/osl_main-website/lib/python2.6/site-
packages/django/db/models/base.py", line 585, in _collect_sub_objects
    delete_qs = rel_descriptor.delete_manager(self).all()
AttributeError: 'ReverseSingleRelatedObjectDescriptor' object has no
attribute 'delete_manager'

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