Hi Malcom and other,
> That would seem to only account for things that are directly attached to
> the current model, rather than more distant relations.
Yes, but that's enough for me.
> Have a look at what Model._collect_sub_objects() does -- or call it
> directly -- to see how Django goes about collecting all the objects for
> deletion. That method is seeded with an empty SortedDict() from
> Model.delete().
I looked at it. It ignores many to many relations.
self._meta.get_all_related_objects() does not return them.
BTW, why does django collect all sub objects? The SQL part "ON DELETE CASCADE"
should
remove them.
Here is the unmodified django code:
"""
def _collect_sub_objects(self, seen_objs):
"""
Recursively populates seen_objs with all objects related to this object.
When done, seen_objs will be in the format:
{model_class: {pk_val: obj, pk_val: obj, ...},
model_class: {pk_val: obj, pk_val: obj, ...}, ...}
"""
pk_val = self._get_pk_val()
if pk_val in seen_objs.setdefault(self.__class__, {}):
return
seen_objs.setdefault(self.__class__, {})[pk_val] = self
for related in self._meta.get_all_related_objects():
rel_opts_name = related.get_accessor_name()
if isinstance(related.field.rel, OneToOneRel):
try:
sub_obj = getattr(self, rel_opts_name)
except ObjectDoesNotExist:
pass
else:
sub_obj._collect_sub_objects(seen_objs)
else:
for sub_obj in getattr(self, rel_opts_name).all():
sub_obj._collect_sub_objects(seen_objs)
"""
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