I have one Django model that points to another one with a OneToOneField,
sort of like this:
class Target(models.model):
# stuff
class Source(models.Model):
target = models.OneToOneField(Target)
Sometimes, given an object that is an instance of Target, I want to
navigate to its Source and delete that:
try:
some_target.source.delete()
except ObjectDoesNotExist:
## nothing to delete!
pass
But this doesn't work: some_target.source will still exist after the
delete() operation has been performed. If I try "some_target.source =
None", I get an exception, complaining that Target.source does not allow
null values. Calling save() and clean_fields() at strategic moments
doesn't seem to work, either.
What does seem to work is reloading the Target object:
try:
some_target.source.delete()
some_target = Target.objects.get(pk=some_target.id)
except Source.DoesNotExist:
## nothing to delete!
pass
Is this a bug in Django, or am I misunderstanding how related or cached
objects are supposed to work?
This is Django 1.2.3, Python 2.6.5, PostgreSQL 8.4.7, all running on
Ubuntu Linux 10.04.
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