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Diffstat (limited to 'docs/api-guide/serializers.md')
| -rw-r--r-- | docs/api-guide/serializers.md | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/docs/api-guide/serializers.md b/docs/api-guide/serializers.md index 42e81cad..1a3c3431 100644 --- a/docs/api-guide/serializers.md +++ b/docs/api-guide/serializers.md @@ -242,21 +242,21 @@ This allows you to write views that update or create multiple items when a `PUT` # True serialize.save() # `.save()` will be called on each updated or newly created instance. -Bulk updates will update any instances that already exist, and create new instances for data items that do not have a corresponding instance. +By default bulk updates will be limited to updating instances that already exist in the provided queryset. -When performing a bulk update you may want any items that are not present in the incoming data to be deleted. To do so, pass `allow_delete=True` to the serializer. +When performing a bulk update you may want to allow new items to be created, and missing items to be deleted. To do so, pass `allow_add_remove=True` to the serializer. - serializer = BookSerializer(queryset, data=data, many=True, allow_delete=True) + serializer = BookSerializer(queryset, data=data, many=True, allow_add_remove=True) serializer.is_valid() # True - serializer.save() # `.save()` will be called on each updated or newly created instance. + serializer.save() # `.save()` will be called on updated or newly created instances. # `.delete()` will be called on any other items in the `queryset`. -Passing `allow_delete=True` ensures that any update operations will completely overwrite the existing queryset, rather than simply updating any objects found in the incoming data. +Passing `allow_add_remove=True` ensures that any update operations will completely overwrite the existing queryset, rather than simply updating existing objects. #### How identity is determined when performing bulk updates -Performing a bulk update is slightly more complicated than performing a bulk creation, because the serializer needs a way of determining how the items in the incoming data should be matched against the existing object instances. +Performing a bulk update is slightly more complicated than performing a bulk creation, because the serializer needs a way to determine how the items in the incoming data should be matched against the existing object instances. By default the serializer class will use the `id` key on the incoming data to determine the canonical identity of an object. If you need to change this behavior you should override the `get_identity` method on the `Serializer` class. For example: |
