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[Validator] UniqueEntity - add note about comparing files. #21264

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[Validator] UniqueEntity - add note about comparing files. #21264

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6 changes: 6 additions & 0 deletions reference/constraints/UniqueEntity.rst
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Expand Up @@ -402,4 +402,10 @@ blank, ``findBy()`` will be used. The method receives as its argument a
fields configured in the ``fields`` option). The method should return a
:phpfunction:`countable PHP variable <is_countable>`.

.. note::

For ``binary`` and ``blob`` fields, instead of comparing large files directly,
consider storing and comparing a hash (e.g., MD5) of the content in your
custom ``repositoryMethod``.

.. _`race conditions`: https://en.wikipedia.org/wiki/Race_condition