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| -rw-r--r-- | docs/topics/db/queries.txt | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/docs/topics/db/queries.txt b/docs/topics/db/queries.txt index baea7c02ac..654c2c5c4a 100644 --- a/docs/topics/db/queries.txt +++ b/docs/topics/db/queries.txt @@ -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: |