#10261: Allow to clear object before deleting to avoid data loss because delete
cascade behaviour
------------------------------------------+---------------------------------
Reporter: msaelices | Owner: nobody
Status: new | Milestone:
Component: Database layer (models, ORM) | Version: 1.0
Keywords: | Stage: Unreviewed
Has_patch: 1 |
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Imaging a model like this:
{{{
#!python
class Master(models.Model):
name = models.CharField(max_length=100)
class Slave(models.Model):
name = models.CharField(max_length=100)
master = models.ForeignKey(Master, null=True)
}}}
And this object creation:
{{{
#!python
>>> m1 = Master.objects.create(name="master1")
>>> s1 = Slave.objects.create(name="slave1", master=m1)
>>> m1.delete() # this will also delete s1
}}}
Django by default, delete in cascade all related objects... even with
{{{null=True}}}.
If you want to avoid this, you can do this:
{{{
#!python
>>> m1.slave_set.clear()
>>> m1.delete()
}}}
This is ok, but it was wonderful if I can change behaviour to not delete
cascade. You can think in admin site for example. If you want to delete a
Category object you have previously to enter in maybe a hundred objects to
set null by hand.
I propose a definition like this:
{{{
#!python
class Slave(models.Model):
name = models.CharField(max_length=100)
master = models.ForeignKey(Master, null=True, delete_cascade=False)
}}}
With {{{delete_cascade=False}}} (by default would be {{{True}}}),
{{{delete()}}} method will clear this relation previously deletion.
I've attached a patch that implements this idea.
--
Ticket URL: <http://code.djangoproject.com/ticket/10261>
Django <http://code.djangoproject.com/>
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