#15959: .values()/.values_list() fails on EmptyQuerySet
----------------------------+----------------------------------------------
Reporter: Davide Rizzo | Owner: nobody
<mail@…> | Status: new
Type: Bug | Component: Database layer (models, ORM)
Milestone: | Severity: Normal
Version: 1.2 | Triage Stage: Unreviewed
Keywords: | Easy pickings: 0
Has patch: 0 |
----------------------------+----------------------------------------------
Calling .values() or .values_list() on an EmptyQuerySet raises an
exception.
{{{
>>> EmptyQuerySet().values('id')
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "C:\Python27\lib\site-packages\django\db\models\query.py", line
515, in values
return self._clone(klass=ValuesQuerySet, setup=True, _fields=fields)
File "C:\Python27\lib\site-packages\django\db\models\query.py", line
1049, in _clone
c = super(EmptyQuerySet, self)._clone(klass, setup=setup, **kwargs)
File "C:\Python27\lib\site-packages\django\db\models\query.py", line
772, in _clone
c._setup_query()
File "C:\Python27\lib\site-packages\django\db\models\query.py", line
895, in _setup_query
self.query.add_fields(self.field_names, False)
File "C:\Python27\lib\site-packages\django\db\models\sql\query.py", line
1549, in add_fields
alias = self.get_initial_alias()
File "C:\Python27\lib\site-packages\django\db\models\sql\query.py", line
798, in get_initial_alias
alias = self.join((None, self.model._meta.db_table, None, None))
AttributeError: 'NoneType' object has no attribute '_meta'
}}}
{{{
>>> EmptyQuerySet().values_list('id')
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "C:\Python27\lib\site-packages\django\db\models\query.py", line
525, in values_list
_fields=fields)
File "C:\Python27\lib\site-packages\django\db\models\query.py", line
1049, in _clone
c = super(EmptyQuerySet, self)._clone(klass, setup=setup, **kwargs)
File "C:\Python27\lib\site-packages\django\db\models\query.py", line
772, in _clone
c._setup_query()
File "C:\Python27\lib\site-packages\django\db\models\query.py", line
895, in _setup_query
self.query.add_fields(self.field_names, False)
File "C:\Python27\lib\site-packages\django\db\models\sql\query.py", line
1549, in add_fields
alias = self.get_initial_alias()
File "C:\Python27\lib\site-packages\django\db\models\sql\query.py", line
798, in get_initial_alias
alias = self.join((None, self.model._meta.db_table, None, None))
AttributeError: 'NoneType' object has no attribute '_meta'
}}}
This seems related to #7235. I can reproduce the bug on 1.2.4 and 1.2.5
but not on 1.2.3.
{{{
### Django 1.2.3
>>> q = EmptyQuerySet()
>>> q.values_list('id')
[]
}}}
--
Ticket URL: <http://code.djangoproject.com/ticket/15959>
Django <http://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
--
You received this message because you are subscribed to the Google Groups
"Django updates" group.
To post to this group, send email to django-updates@googlegroups.com.
To unsubscribe from this group, send email to
django-updates+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/django-updates?hl=en.
