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Give an example of copying a polymorphic object

fix_request_path_info
Michael Scott Cuthbert 2018-01-29 20:04:41 -05:00 committed by Diederik van der Boor
parent f769ed7568
commit 9225f08141
1 changed files with 14 additions and 0 deletions
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docs/advanced.rst
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@ -92,6 +92,20 @@ A ManyToManyField example::
<ModelB: id 2, field1 (CharField), field2 (CharField)>,
<ModelC: id 3, field1 (CharField), field2 (CharField), field3 (CharField)> ]
Copying Polymorphic objects
---------------------------
When creating a copy of a polymorphic object, both the
``.id`` and the ``.pk`` of the object need to be set
to ``None`` before saving so that both the base table
and the derived table will be updated to the new object::
>>> o = ModelB.objects.first()
>>> o.field1 = 'new val' # leave field2 unchanged
>>> o.pk = None
>>> o.id = None
>>> o.save()
Using Third Party Models (without modifying them)
-------------------------------------------------