#11920: Cannot access related field of an unsaved object if the object is from
an
inherited model
---------------------------------------------------+------------------------
Reporter: zbyte64 | Owner: nessita
Status: assigned | Milestone: 1.2
Component: Database layer (models, ORM) | Version: 1.1
Resolution: | Keywords: related
field doesnotexist
Stage: Accepted | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
---------------------------------------------------+------------------------
Comment (by nessita):
Even though the example is not correct (when creating the {{{new_parent}}}
object, the old, saved {{{parent}}} instance is used to query the
{{{baseline_set}}} instead of the unsaved {{{new_parent}}}), the problem
still persists when doing:
{{{
#!python
In [1]: from fix_11920.models import *
In [2]: Parent().baseline_set
Out[2]: <django.db.models.fields.related.RelatedManager object at
0x96f936c>
In [3]: Child().sibling_set
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (77, 0))
---------------------------------------------------------------------------
DoesNotExist Traceback (most recent call
last)
/home/nessita/pycon/test_project/<ipython console> in <module>()
/home/nessita/pycon/django-sprint/lib/python2.6/site-
packages/django/db/models/fields/related.pyc in __get__(self, instance,
instance_type)
352
353 return self.create_manager(instance,
--> 354 self.related.model._default_manager.__class__)
355
356 def __set__(self, instance, value):
/home/nessita/pycon/django-sprint/lib/python2.6/site-
packages/django/db/models/fields/related.pyc in create_manager(self,
instance, superclass)
429 attname = rel_field.rel.get_related_field().name
430 manager.core_filters = {'%s__%s' % (rel_field.name,
attname):
--> 431 getattr(instance, attname)}
432 manager.model = self.related.model
433
/home/nessita/pycon/django-sprint/lib/python2.6/site-
packages/django/db/models/fields/related.pyc in __get__(self, instance,
instance_type)
262 if self.field.null:
263 return None
--> 264 raise self.field.rel.to.DoesNotExist
265 other_field = self.field.rel.get_related_field()
266 if other_field.rel:
DoesNotExist:
}}}
--
Ticket URL: <http://code.djangoproject.com/ticket/11920#comment:4>
Django <http://code.djangoproject.com/>
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