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Code Issues 25 Releases Wiki Activity

Documented how to copy a OneToOneField.

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Thanks Anton Gilgur for the report and review.
This commit is contained in:
Tim Graham 2016-12-16 18:34:41 -05:00
parent 8dac9890a5
commit 2f44fa7f06
1 changed files with 9 additions and 0 deletions
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9
docs/topics/db/queries.txt
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@ -985,6 +985,15 @@ entry::
entry.save() entry.save()
entry.authors.set(old_authors) entry.authors.set(old_authors)
For a ``OneToOneField``, you must duplicate the related object and assign it
to the new object's field to avoid violating the one-to-one unique constraint.
For example, assuming ``entry`` is already duplicated as above::
detail = EntryDetail.objects.all()[0]
detail.pk = None
detail.entry = entry
detail.save()
.. _topics-db-queries-update: .. _topics-db-queries-update:
Updating multiple objects at once Updating multiple objects at once