#4027: ability to make a copies of model instances
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Reporter: Marek Kubica | Owner: nobody
Status: new | Milestone:
Component: Documentation | Version: SVN
Resolution: | Keywords: db, copy
Stage: Accepted | Has_patch: 0
Needs_docs: 1 | Needs_tests: 0
Needs_better_patch: 0 |
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Changes (by mtredinnick):
* has_patch: 1 => 0
* component: Database layer (models, ORM) => Documentation
* stage: Design decision needed => Accepted
Comment:
This is possible in a few lines of code for each model. You can copy many-
to-many field by doing `new_instance.m2m = old_instance.m2m.all()`, for
example. Ditto for foreign keys. This isn't always want you want when
creating a copy of a model, however (think deep-copy versus shallow-copy),
so really has to be left up to the individual case. For any particular
model, a duplicate method is short enough already that Django doesn't need
additions.
*However*, a documentation patch to explain this little fragment would be
useful. We should start capturing some of these little patterns.
--
Ticket URL: <http://code.djangoproject.com/ticket/4027#comment:14>
Django <http://code.djangoproject.com/>
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