#20257: QuerySet that prefetches related object with a ManyToMany field cannot
be
pickled.
-------------------------------------+--------------------------------
Reporter: bryced | Owner: nobody
Type: Bug | Status: new
Component: Core (Cache system) | Version: 1.5
Severity: Release blocker | Keywords: ORM, pickle, cache
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+--------------------------------
After upgrading from 1.4 to 1.5, exceptions were thrown when trying to
pickle certain querysets. This means that the caching framework doesn't
work for these querysets.
In 1.4 the following code runs fine. In 1.5 this error occurs:
{{{
PicklingError: Can't pickle <class 'people.models.SocialProfile_friends'>:
it's not found as people.models.SocialProfile_friends
}}}
models.py
{{{
from django.db import models
class Person(models.Model):
name = models.CharField(max_length=200)
class SocialProfile(models.Model):
person = models.ForeignKey(Person)
friends = models.ManyToManyField('self')
}}}
tests.py
{{{
from django.test import TestCase
from people.models import Person
import pickle
class SimpleTest(TestCase):
def test_pickle_failure(self):
bob = Person(name="Bob")
bob.save()
people =
Person.objects.all().prefetch_related('socialprofile_set')
pickle.dumps(people)
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/20257>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
--
You received this message because you are subscribed to the Google Groups
"Django updates" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
For more options, visit https://groups.google.com/groups/opt_out.
