id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
7746	Paginator QuerySet count regression	chrisrbennett	nobody	"The enhancement for #7478 committed in [7865] regresses on a previous bug fix in [7819] related to !QuerySet paginiation.

I copied the try-wrapper fix from [7819] and this seems to handle the exception:
{{{
try:
    self._count = self.object_list.count()
except (AttributeError, TypeError):
    self._count = len(self.object_list)
}}}

I have no clue why .count() model deepcopy is failing, but it has been discussed previously in #7204. Perhaps there is a larger issue here:

{{{ 
Environment:
Django Version: 0.97-pre-SVN-7922
Python Version: 2.5.2

Traceback:
File ""/usr/lib/python2.5/site-packages/django/core/handlers/base.py"" in get_response
  86.                 response = callback(request, *callback_args, **callback_kwargs)
File ""/home/chris/src/msn/msn/../msn/search/views.py"" in zipcode_search
  64.                ""page"": paginator.page(page_number),
File ""/usr/lib/python2.5/site-packages/django/core/paginator.py"" in page
  35.         number = self.validate_number(number)
File ""/usr/lib/python2.5/site-packages/django/core/paginator.py"" in validate_number
  26.         if number > self.num_pages:
File ""/usr/lib/python2.5/site-packages/django/core/paginator.py"" in _get_num_pages
  56.             hits = self.count - 1 - self.orphans
File ""/usr/lib/python2.5/site-packages/django/core/paginator.py"" in _get_count
  47.                 self._count = self.object_list.count()
File ""/usr/lib/python2.5/site-packages/django/db/models/query.py"" in count
  290.         return self.query.get_count()
File ""/usr/lib/python2.5/site-packages/django/db/models/sql/query.py"" in get_count
  215.         obj = self.clone()
File ""/usr/lib/python2.5/site-packages/django/db/models/sql/query.py"" in clone
  173.         obj.where = deepcopy(self.where)
File ""/usr/lib/python2.5/copy.py"" in deepcopy
  173.                 y = copier(memo)
File ""/usr/lib/python2.5/site-packages/django/utils/tree.py"" in __deepcopy__
  61.         obj.children = deepcopy(self.children, memodict)
File ""/usr/lib/python2.5/copy.py"" in deepcopy
  162.         y = copier(x, memo)
File ""/usr/lib/python2.5/copy.py"" in _deepcopy_list
  227.         y.append(deepcopy(a, memo))
File ""/usr/lib/python2.5/copy.py"" in deepcopy
  162.         y = copier(x, memo)
File ""/usr/lib/python2.5/copy.py"" in _deepcopy_tuple
  234.         y.append(deepcopy(a, memo))
File ""/usr/lib/python2.5/copy.py"" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File ""/usr/lib/python2.5/copy.py"" in _reconstruct
  337.             state = deepcopy(state, memo)
File ""/usr/lib/python2.5/copy.py"" in deepcopy
  162.         y = copier(x, memo)
File ""/usr/lib/python2.5/copy.py"" in _deepcopy_dict
  254.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File ""/usr/lib/python2.5/copy.py"" in deepcopy
  162.         y = copier(x, memo)
File ""/usr/lib/python2.5/copy.py"" in _deepcopy_list
  227.         y.append(deepcopy(a, memo))
File ""/usr/lib/python2.5/copy.py"" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File ""/usr/lib/python2.5/copy.py"" in _reconstruct
  337.             state = deepcopy(state, memo)
File ""/usr/lib/python2.5/copy.py"" in deepcopy
  162.         y = copier(x, memo)
File ""/usr/lib/python2.5/copy.py"" in _deepcopy_dict
  254.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File ""/usr/lib/python2.5/copy.py"" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File ""/usr/lib/python2.5/copy.py"" in _reconstruct
  322.     y = callable(*args)
File ""/usr/lib/python2.5/copy_reg.py"" in __newobj__
  92.     return cls.__new__(cls, *args)

Exception Type: TypeError
Exception Value: object.__new__(generator) is not safe, use generator.__new__()
}}}

cc'ing those involved with #7478"		closed	Core (Other)	dev		invalid	paginator	batiste@… Adrian Holovaty mrts	Unreviewed	0	0	0	0	0	0