Hi.
So I came across a use-case for wanting to delete content (which
django doesn't really handle exactly to my liking). I just got back
from a vacation in vegas and noticed in a drunken stupor I had posted
some pictures on my blog that should I really shouldn't have (
http://i.imgur.com/5oj15.jpg SFW).
Anyhow, currently django's only delete behavior (to my knowledge) is
to delete all objects related from a reverse relation. I think it
would be preferable to actually delete only objects that have NOT NULL
**and** no default set.
Right now clear() sort of fills some of the void for what you need to
do prior to deleting an object, but it fails to handle DEFAULT
conditions.
I realize changing the default behavior of the delete() method is
probably out of the question... and there are a bunch of tickets open
asking for cascades and what-not, that will hopefully one day fill the
void. clear(), however, *should* handle DEFAULTS in the same way it
handles null=True.
Also, I wrote a mix-in class that fixes the delete method to work as I
believe it should... for those of you with similar use-cases. Anyone
have any feedback on it?
ps. I didn't really murder a hooker in vegas (I don't even have a
blog), just felt that I should provide a relevant use-case ;)
from django.db.models.fields import NOT_PROVIDED
from django.contrib import admin
class ClearOnDelete(models.Model):
def delete(self):
related_objects = self._meta.get_all_related_objects()
for object in related_objects:
accessor_name = object.get_accessor_name()
related_accessor = getattr(self.__class__, accessor_name)
related_accessor_instance = getattr(self, accessor_name)
if related_accessor.related.field.default is not
NOT_PROVIDED:
for relation in related_accessor_instance.all():
setattr(relation,
related_accessor.related.field.name,
related_accessor.related.field.default)
relation.save()
elif related_accessor.related.field.null:
for relation in related_accessor_instance.all():
setattr(relation,
related_accessor.related.field.name, None)
relation.save()
super(ClearOnDelete, self).delete()
class Meta:
abstract = True
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