id summary reporter owner description type status component version severity resolution keywords cc stage has_patch needs_docs needs_tests needs_better_patch easy ui_ux 10261 Allow to clear object before deleting to avoid data loss because delete cascade behaviour Manuel Saelices nobody "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." closed Database layer (models, ORM) 1.0 duplicate Unreviewed 1 0 0 0 0 0