#29085: Possible data loss on .save() with unsaved related model
-------------------------------------+-------------------------------------
Reporter: Jonas | Owner: nobody
Haag |
Type: | Status: new
Uncategorized |
Component: Database | Version: master
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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- Create unsaved model C
- Assign unsaved related model P
- Save related model P and C
- Relationship is lost
This is similar to #25160 I guess?
I reproduced this with all versions of Django 1.6 up to master.
{{{
from django.db import models
class Parent(models.Model):
pass
class Child(models.Model):
parent = models.ForeignKey(Parent, null=True, blank=True,
on_delete=models.CASCADE)
}}}
{{{
from .models import Parent, Child
from django.test import TestCase
class MyTest(TestCase):
def test_save(self):
child = Child()
child.parent = Parent()
child.parent.save()
# This makes the problem go away:
# child.parent = child.parent
child.save()
child.refresh_from_db()
self.assertIsNotNone(child.parent)
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/29085>
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