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Added a caution note about race conditions in EntityType #10051

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Jul 13, 2018
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Added a caution note about race conditions in EntityType #10051

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9 changes: 9 additions & 0 deletions reference/constraints/UniqueEntity.rst
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Expand Up @@ -109,6 +109,13 @@ your user table:
}
}

.. caution::

This constraint doesn't provide any protection against `race conditions`_.
They may occur when another entity is persisted by an external process after
this validation has passed and before this entity is actually persisted in
the database.

Options
-------

Expand Down Expand Up @@ -262,3 +269,5 @@ If set to ``false``, only one ``null`` value is allowed - if a second entity
also has a ``null`` value, validation would fail.

.. include:: /reference/constraints/_payload-option.rst.inc

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