Django 1.2 + South 0.7 + django-annoying's AutoOneToOneField leads to TypeError: 'LegacyConnection'
- by konrad
I'm using Django 1.2 trunk with South 0.7 and an AutoOneToOneField copied from django-annoying. South complained that the field does not have rules defined and the new version of South no longer has an automatic field type parser. So I read the South documentation and wrote the following definition (basically an exact copy of the OneToOneField rules):
rules = [
(
(AutoOneToOneField),
[],
{
"to": ["rel.to", {}],
"to_field": ["rel.field_name", {"default_attr": "rel.to._meta.pk.name"}],
"related_name": ["rel.related_name", {"default": None}],
"db_index": ["db_index", {"default": True}],
},
)
]
from south.modelsinspector import add_introspection_rules
add_introspection_rules(rules, ["^myapp"])
Now South raises the following error when I do a schemamigration.
Traceback (most recent call last):
File "manage.py", line 11, in <module>
execute_manager(settings)
File "django/core/management/__init__.py", line 438, in execute_manager
utility.execute()
File "django/core/management/__init__.py", line 379, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "django/core/management/base.py", line 196, in run_from_argv
self.execute(*args, **options.__dict__)
File "django/core/management/base.py", line 223, in execute
output = self.handle(*args, **options)
File "South-0.7-py2.6.egg/south/management/commands/schemamigration.py", line 92, in handle
(k, v) for k, v in freezer.freeze_apps([migrations.app_label()]).items()
File "South-0.7-py2.6.egg/south/creator/freezer.py", line 33, in freeze_apps
model_defs[model_key(model)] = prep_for_freeze(model)
File "South-0.7-py2.6.egg/south/creator/freezer.py", line 65, in prep_for_freeze
fields = modelsinspector.get_model_fields(model, m2m=True)
File "South-0.7-py2.6.egg/south/modelsinspector.py", line 322, in get_model_fields
args, kwargs = introspector(field)
File "South-0.7-py2.6.egg/south/modelsinspector.py", line 271, in introspector
arg_defs, kwarg_defs = matching_details(field)
File "South-0.7-py2.6.egg/south/modelsinspector.py", line 187, in matching_details
if any([isinstance(field, x) for x in classes]):
TypeError: 'LegacyConnection' object is not iterable
Is this related to a recent change in Django 1.2 trunk? How do I fix this?
I use this field as follows:
class Bar(models.Model):
foo = AutoOneToOneField("foo.Foo", primary_key=True, related_name="bar")
For reference the field code from django-tagging:
class AutoSingleRelatedObjectDescriptor(SingleRelatedObjectDescriptor):
def __get__(self, instance, instance_type=None):
try:
return super(AutoSingleRelatedObjectDescriptor, self).__get__(instance, instance_type)
except self.related.model.DoesNotExist:
obj = self.related.model(**{self.related.field.name: instance})
obj.save()
return obj
class AutoOneToOneField(OneToOneField):
def contribute_to_related_class(self, cls, related):
setattr(cls, related.get_accessor_name(), AutoSingleRelatedObjectDescriptor(related))
