Hello,
I have so far not found any discussion of a particular problem I
encountered. I'm not sure that isn't just me doing something
incorrectly so would appreciate knowing if anyone else has seen this.
I have a pair of models where one inherits from the other (Multi-table
inheritance). The parent model in that relationship has a ForeignKey
relation to a third model with an order_with_respect_to meta option
set to that ForeignKey.
Although I seem to be able to work with these models in the shell
(create, save, list). If I use the dumpdata management command I get
the following error.
$ ./manage.py dumpdata myapp
Traceback (most recent call last):
File "./manage.py", line 12, in <module>
execute_manager(settings)
File "/home/bdp/Checkouts/django-trunk/django/core/management/
__init__.py", line 362, in execute_manager
utility.execute()
File "/home/bdp/Checkouts/django-trunk/django/core/management/
__init__.py", line 303, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/bdp/Checkouts/django-trunk/django/core/management/
base.py", line 195, in run_from_argv
self.execute(*args, **options.__dict__)
File "/home/bdp/Checkouts/django-trunk/django/core/management/
base.py", line 222, in execute
output = self.handle(*args, **options)
File "/home/bdp/Checkouts/django-trunk/django/core/management/
commands/dumpdata.py", line 76, in handle
objects.extend(model._default_manager.all())
File "/home/bdp/Checkouts/django-trunk/django/db/models/query.py",
line 83, in __len__
self._result_cache.extend(list(self._iter))
File "/home/bdp/Checkouts/django-trunk/django/db/models/query.py",
line 238, in iterator
for row in self.query.results_iter():
File "/home/bdp/Checkouts/django-trunk/django/db/models/sql/
query.py", line 287, in results_iter
for rows in self.execute_sql(MULTI):
File "/home/bdp/Checkouts/django-trunk/django/db/models/sql/
query.py", line 2360, in execute_sql
sql, params = self.as_sql()
File "/home/bdp/Checkouts/django-trunk/django/db/models/sql/
query.py", line 397, in as_sql
ordering, ordering_group_by = self.get_ordering()
File "/home/bdp/Checkouts/django-trunk/django/db/models/sql/
query.py", line 962, in get_ordering
self.model._meta, default_order=asc):
File "/home/bdp/Checkouts/django-trunk/django/db/models/sql/
query.py", line 991, in find_ordering_name
opts, alias, False)
File "/home/bdp/Checkouts/django-trunk/django/db/models/sql/
query.py", line 1737, in setup_joins
"Choices are: %s" % (name, ", ".join(names)))
django.core.exceptions.FieldError: Cannot resolve keyword '_order'
into field. Choices are: category, id, item_ptr, name, notes
If I comment out the order_with_respect_to meta option the message
goes away. I first encountered this error running the release version
if Django (as installed by easy_install) but I tried it with django-
trunk and got the same thing.
I simplified my models down to some basics which still cause the
problem.
class Category(models.Model):
name = models.CharField(max_length=30, unique=True)
class Meta:
ordering = ['name']
class Item(models.Model):
name = models.CharField(max_length=30, unique=True)
category = models.ForeignKey(Category)
class Meta:
order_with_respect_to = 'category'
class OtherItem(Item):
notes = models.TextField(blank=True)
Am I trying to do something that should not work? Or am I doing it the
wrong way?
Sincerely,
Bradley Peters
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