#14515: Can't pickle ValueQuerySet if query references fields, which aren't on
the
same model.
---------------------------------------------------+------------------------
Reporter: apollo13 | Owner: nobody
Status: new | Milestone:
Component: Database layer (models, ORM) | Version: 1.2
Resolution: | Keywords:
Stage: Accepted | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
---------------------------------------------------+------------------------
Changes (by russellm):
* stage: Unreviewed => Accepted
* milestone: 1.3 =>
Old description:
> This will work during pickle.dumps: http://paste.pocoo.org/show/278047/
> but will fail when I run loads.
>
> The reason is that {{{ __getstate__ }}} of {{{ ValueQueryset }}} puts
> (in this case) {{{ ['name', 'deleted', 'id', 'id'] }}} into {{{
> obj_dict['search_fields'] }}}
> (http://code.djangoproject.com/browser/django/trunk/django/db/models/sql/query.py#L176);
> during loads it won't find Page.deleted etc… (full traceback:
> http://paste.pocoo.org/show/278050/)
New description:
This will work during pickle.dumps:
{{{
pagelist = Page.objects.all().select_related('last_rev')\
.order_by('name').values_list('name', 'last_rev__deleted',
'last_rev__id', 'last_rev__attachment__id')
# force a list, can't pickle ValueQueryset that way
pagelist = list(pagelist)
request_cache.set(key, pagelist, 10000)
}}}
but will fail when I run loads.
The reason is that {{{ __getstate__ }}} of {{{ ValueQueryset }}} puts (in
this case) {{{ ['name', 'deleted', 'id', 'id'] }}} into {{{
obj_dict['search_fields'] }}}
(http://code.djangoproject.com/browser/django/trunk/django/db/models/sql/query.py#L176);
during loads it won't find Page.deleted etc… Full traceback:
{{{
Traceback (most recent call last):
File "/home/florian/.virtualenvs/inyoka/inyoka/inyoka/application.py",
line 52, in __call__
return self.app(environ, start_response)
File "/home/florian/.virtualenvs/inyoka/lib/python2.6/site-
packages/Django-1.2.3-py2.6.egg/django/core/handlers/wsgi.py", line 241,
in __call__
response = self.get_response(request)
File "/home/florian/.virtualenvs/inyoka/inyoka/inyoka/application.py",
line 88, in get_response
return callback(request, *args, **kwargs)
File "/home/florian/.virtualenvs/inyoka/inyoka/inyoka/wiki/views.py",
line 60, in show_page
return PAGE_ACTIONS[action or 'show'](request, normalized_name)
File "/home/florian/.virtualenvs/inyoka/inyoka/inyoka/wiki/acl.py", line
217, in oncall
return f(request, name)
File "/home/florian/.virtualenvs/inyoka/inyoka/inyoka/utils/http.py",
line 40, in proxy
rv = f(request, *args, **kwargs)
File "/home/florian/.virtualenvs/inyoka/inyoka/inyoka/wiki/actions.py",
line 99, in do_show
return do_missing_page(request, name)
File "/home/florian/.virtualenvs/inyoka/inyoka/inyoka/utils/http.py",
line 40, in proxy
rv = f(request, *args, **kwargs)
File "/home/florian/.virtualenvs/inyoka/inyoka/inyoka/wiki/actions.py",
line 199, in do_missing_page
} for x in sorted(Page.objects.get_similar(name))],
File "/home/florian/.virtualenvs/inyoka/inyoka/inyoka/wiki/models.py",
line 346, in get_similar
self._get_object_list(False) if not x[1]], n)]
File "/home/florian/.virtualenvs/inyoka/inyoka/inyoka/wiki/models.py",
line 200, in _get_object_list
pagelist = request_cache.get(key)
File "/home/florian/.virtualenvs/inyoka/inyoka/inyoka/utils/cache.py",
line 68, in get
val = self.real_cache.get(key)
File "/home/florian/.virtualenvs/inyoka/inyoka/inyoka/utils/cache.py",
line 118, in get
self.cache.get(key))
File "/home/florian/.virtualenvs/inyoka/lib/python2.6/site-
packages/Werkzeug-0.6.2-py2.6.egg/werkzeug/contrib/cache.py", line 229, in
get
return loads(value)
File "/home/florian/.virtualenvs/inyoka/lib/python2.6/site-
packages/Django-1.2.3-py2.6.egg/django/db/models/sql/query.py", line 200,
in __setstate__
for name in obj_dict['select_fields']
File "/home/florian/.virtualenvs/inyoka/lib/python2.6/site-
packages/Django-1.2.3-py2.6.egg/django/db/models/options.py", line 273, in
get_field
raise FieldDoesNotExist('%s has no field named %r' %
(self.object_name, name))
FieldDoesNotExist: Page has no field named 'deleted'
}}}
Comment:
Removed references to a pastebin. Trac provides perfectly adequate source
code quoting tools, and has no risk of expiring, getting deleted etc.
--
Ticket URL: <http://code.djangoproject.com/ticket/14515#comment:4>
Django <http://code.djangoproject.com/>
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