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[serializer] document DEEP_OBJECT_TO_POPULATE #11344

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[serializer] document DEEP_OBJECT_TO_POPULATE #11344

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14 changes: 14 additions & 0 deletions components/serializer.rst
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Expand Up @@ -210,6 +210,20 @@ The serializer can also be used to update an existing object::

This is a common need when working with an ORM.

The ``OBJECT_TO_POPULATE`` is only used for the top level object. If that object
is the root of a tree structure, all child elements that exist in the
normalized data will be re-created with new instances.

..versionadded:: 4.3

Symfony 4.3 introduces a new option ``AbstractObjectNormalizer::DEEP_OBJECT_TO_POPULATE``.
When this flag is set to true, existing children of the root ``OBJECT_TO_POPULATE`` are
updated from the normalized data, instead of the denormalizer re-creating them.

Note that ``DEEP_OBJECT_TO_POPULATE`` only works for single child objects,
but not for arrays of objects. Those will still be replaces when present in
the normalized data.

.. _component-serializer-attributes-groups:

Attributes Groups
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