Inconsistent behaviour in querying and creating objects
|Reported by:||DmitryRisenberg||Owned by:||nobody|
|Component:||Database layer (models, ORM)||Version:||1.1|
|Has patch:||no||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
I have a strange behaviour for the following models:
from django.db import models class Channel(models.Model): def createSubscription(self): subscription = Subscription.objects.create(channel = self) print Subscription.objects.filter(channel = self) return subscription class FeedChannel(Channel): link = models.CharField(max_length = 200, primary_key = True) class Subscription(models.Model): channel = models.ForeignKey(Channel)
This is what I get when I run ./manage.py shell with a newly created DB:
>>> from smth import models >>> c = models.FeedChannel.objects.create() >>> s = c.createSubscription()  >>> print s.channel.id, c.channel_ptr.id 1 1 >>> >>>
filter query in
createSubscription does not include the created object. I either expect the
filter query to select the newly created
Subscription object, because its
channel field points to the correct
Channel instance, or the
create query to fail when it encounters an object of derived type instead of base.
primary_key constraint on
link field everything works just as expected.
I am using Django 1.1 and Python 2.5.