Hi,
since obj.delete() uses "on delete cascade", I want to see first
which instances still have a reference to obj (and would get deleted).
I write this little helper. Comments welcome:
def all_related_instances(instance):
"""
Return all instances which have a relation to this instance.
You can check this list before instance.delete(), since all returned
instances would get deleted, too (ON DELETE CASCADE)
"""
assert isinstance(instance, models.Model)
meta=instance._meta
related=[]
for related_object in
meta.get_all_related_objects()+meta.get_all_related_many_to_many_objects():
attr = getattr(instance, related_object.get_accessor_name())
related.extend(attr.all())
return related
--
Thomas Güttler, http://www.tbz-pariv.de/
Bernsdorfer Str. 210-212, 09126 Chemnitz, Tel.: 0371/5347-917
TBZ-PARIV GmbH Geschäftsführer: Dr. Reiner Wohlgemuth
Sitz der Gesellschaft: Chemnitz Registergericht: Chemnitz HRB 8543
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