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[JsonStreamer] Mention how to get the current object in value transformers #21275

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[JsonStreamer] Mention how to get the current object in value transformers #21275

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10 changes: 10 additions & 0 deletions serializer/streaming_json.rst
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Expand Up @@ -541,6 +541,16 @@ When callables are not enough, you can use a service implementing the
The ``getStreamValueType()`` method must return the value's type as it will
appear in the JSON stream.

.. tip::

The ``$options`` argument of the ``transform()`` method includes a special
option called ``_current_object`` which gives access to the object holding
the current property (or ``null`` if there's none).

.. versionadded:: 7.4

The ``_current_object`` option was introduced in Symfony 7.4.

To use this transformer in a class, configure the ``#[ValueTransformer]`` attribute::

// src/Dto/Dog.php
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