I'm using python 2.4 and django 1.2.4 with MySQL 5.0 FWIW
I have the following models (code deleted to simplify)
class Message(models.Model):
facility = models.CharField(max_length=2, null=True, blank=True)
msgtype = models.CharField(max_length=3)
class Pv(models.Model):
message = models.OneToOneField(Message, primary_key=True,
db_column='id')
location = models.CharField(max_length=6, null=True,
blank=True)
priorfacility = models.CharField(max_length=2, null=True,
blank=True)
Now I've discovered that on rare occasions Pv does not exists and thus
referencing it like this
for message in models.Message.objects.select_related():
new = [message.pv.facility, ...
throws
django.db.models.base.DoesNotExist: Pv matching query does not exist.
When I encounter a missing PV record.
Is this my improper use of OneToOneField and I should have used
ForeignKeyField ?
Is there a way to see if the PV object exists other than surrounding it
with a try/except clause ?
The times when Pv is missing are rare; would it make more sense to just
create a record with nulls and maintain the 1-to-1 relationship?
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