#11194 closed (fixed)
Saving proxy model with raw=True gives UnboundLocalError 'record_exists'
Reported by: | wardi | Owned by: | nobody |
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Component: | Database layer (models, ORM) | Version: | 1.1-beta |
Severity: | Keywords: | proxy model serialization | |
Cc: | Triage Stage: | Unreviewed | |
Has patch: | yes | Needs documentation: | no |
Needs tests: | yes | Patch needs improvement: | yes |
Easy pickings: | no | UI/UX: | no |
Description
When importing data I am running into this error:
Problem installing fixture '../tpm/contacts/fixtures/sampladata.json': Traceback (most recent call last): File "/usr/local/lib/python2.5/site-packages/django/core/management/commands/loaddata.py", line 153, in handle obj.save() File "/usr/local/lib/python2.5/site-packages/django/core/serializers/base.py", line 163, in save models.Model.save_base(self.object, raw=True) File "/usr/local/lib/python2.5/site-packages/django/db/models/base.py", line 495, in save_base created=(not record_exists), raw=raw) UnboundLocalError: local variable 'record_exists' referenced before assignment
Attachments (1)
Change History (7)
by , 15 years ago
Attachment: | db.models.base.patch added |
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comment:1 by , 15 years ago
It would help if you would provide sample data to recreate the error. If all fixture loading was broken, the test suite would be having serious problems, and it is not. So what is special about you data that is triggering this problem?
comment:2 by , 15 years ago
I can reproduce this error with this model:
from django.contrib.auth.models import User class UserProxy(User): class Meta: proxy = True
and with any fixture, for e.g.
{ "model": "myapp.userproxy", "pk": 1, "fields": { "username": "username" } }
It also can be repoduced without fixtures:
>>> from myapp.models import UserProxy >>> UserProxy(username='username').save_base(raw=True) Traceback (most recent call last): ... UnboundLocalError: local variable 'record_exists' referenced before assignment
comment:3 by , 15 years ago
milestone: | → 1.1 |
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Needs tests: | set |
Patch needs improvement: | set |
OK, so the problem is a combination of using raw=True
(as fixture loading (always?) does) and proxy models. It looks to me like the save_base
routine is coded to never expect to be called with both raw=True
and meta.proxy=True
. The attached patch fixes the visible error (avoids an exception) but the resulting behavior of the function does not appear to be correct. It sends a pre-save signal, then skips out on the saving of parent class(es) because raw is True, then skips out on the remainder of the try an update, try an insert logic because meta.proxy is True. The only thing left not under the if not meta.proxy
is the sending of the post save signal. So that patch makes it possible to call the routine, and the pre and post save signals will be sent, but nothing will be saved. There seems to be a deeper problem than a local variable used before being set here.
Setting 1.1 milestone because someone with a clue about proxy models and serialization should probably look at this before 1.1.
comment:4 by , 15 years ago
Component: | Uncategorized → Database layer (models, ORM) |
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Keywords: | proxy model serialization added; record_exists db import removed |
Summary: | django.db.models.base.py: UnboundLocalError: local variable 'record_exists' referenced before assignment → Saving proxy model with raw=True gives UnboundLocalError 'record_exists' |
comment:5 by , 15 years ago
Resolution: | → fixed |
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Status: | new → closed |
patch to define record_exists in all cases