#4027: ability to make a copies of model instances
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Reporter: Marek Kubica | Owner: nobody
Status: new | Milestone:
Component: Database wrapper | Version: SVN
Resolution: | Keywords: db, copy
Stage: Design decision needed | Has_patch: 1
Needs_docs: 1 | Needs_tests: 1
Needs_better_patch: 1 |
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Comment (by miracle2k):
With QSRF and model inheritance, setting the pk of a subclass model to
None is no longer enough to make a copy. From what I can tell, the best
working approach seems to be:
{{{
def copy_model_instance(obj):
from django.db.models import AutoField
initial = dict([(f.name, getattr(obj, f.name))
for f in obj._meta.fields
if not isinstance(f, AutoField) and\
not f in obj._meta.parents.values()])
return obj.__class__(**initial)
}}}
This is without handling m2m relationships.
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Ticket URL: <http://code.djangoproject.com/ticket/4027#comment:8>
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