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Code Issues 25 Releases Wiki Activity

Refs #25550 -- Removed a deprecated reverse assignment example in docs.

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This commit is contained in:
Tim Graham 2016-12-16 17:54:21 -05:00
parent af5983e4f5
commit 8dac9890a5
1 changed files with 5 additions and 4 deletions
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docs/topics/db/queries.txt
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@ -974,15 +974,16 @@ Due to how inheritance works, you have to set both ``pk`` and ``id`` to None::
django_blog.id = None
django_blog.save() # django_blog.pk == 4
This process does not copy related objects. If you want to copy relations,
you have to write a little bit more code. In our example, ``Entry`` has a many to many
field to ``Author``::
This process doesn't copy relations that aren't part of the model's database
table. For example, ``Entry`` has a ``ManyToManyField`` to ``Author``. After
duplicating an entry, you must set the many-to-many relations for the new
entry::
entry = Entry.objects.all()[0] # some previous entry
old_authors = entry.authors.all()
entry.pk = None
entry.save()
entry.authors = old_authors # saves new many2many relations
entry.authors.set(old_authors)
.. _topics-db-queries-update: