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[Reference][Constraints] validate null (Expression constraint in 2.6) #4204

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Oct 19, 2014
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[Reference][Constraints] validate null (Expression constraint in 2.6) #4204

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11 changes: 5 additions & 6 deletions reference/constraints/Expression.rst
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Expand Up @@ -217,12 +217,11 @@ more about the expression language syntax, see
// ...
}

.. caution::

In Symfony 2.4 and Symfony 2.5, if the property (e.g. ``isTechnicalPost``)
were ``null``, the expression would never be called and the value
would be seen as valid. To ensure that the value is not ``null``,
use the :doc:`NotNull constraint </reference/constraints/NotNull>`.
.. versionadded:: 2.6
In Symfony 2.6, the Expression constraint *is* executed if the value
is ``null``. Before 2.6, if the value was ``null``, the expression
was never executed and the value was considered valid (unless you
also had a constraint like `NotBlank` on the property).

For more information about the expression and what variables are available
to you, see the :ref:`expression <reference-constraint-expression-option>`
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