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[Validator] Add normalizer option to Unique constraint #15124

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Mar 27, 2021
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[Validator] Add normalizer option to Unique constraint #15124

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24 changes: 22 additions & 2 deletions reference/constraints/Unique.rst
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Expand Up @@ -2,8 +2,9 @@ Unique
======

Validates that all the elements of the given collection are unique (none of them
is present more than once). Elements are compared strictly, so ``'7'`` and ``7``
are considered different elements (a string and an integer, respectively).
is present more than once). By default elements are compared strictly,
so ``'7'`` and ``7`` are considered different elements (a string and an integer, respectively).
If you want any other comparison logic to be applied, use the `normalizer`_ option.

.. seealso::

Expand All @@ -21,6 +22,7 @@ are considered different elements (a string and an integer, respectively).
Applies to :ref:`property or method <validation-property-target>`
Options - `groups`_
- `message`_
- `normalizer`_
- `payload`_
Class :class:`Symfony\\Component\\Validator\\Constraints\\Unique`
Validator :class:`Symfony\\Component\\Validator\\Constraints\\UniqueValidator`
Expand Down Expand Up @@ -123,4 +125,22 @@ Parameter Description
``{{ value }}`` The current (invalid) value
============================= ================================================

``normalizer``
~~~~~~~~~~~~~~

**type**: a `PHP callable`_ **default**: ``null``

.. versionadded:: 5.3

The ``normalizer`` option was introduced in Symfony 5.3.

This option allows to define the PHP callable applied to each element of the given collection before
checking if the collection is valid.

For example, you may want to pass the ``'trim'`` string to apply the
:phpfunction:`trim` PHP function to each element of the collection in order to ignore leading and trailing
whitespace during validation.

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Please add a versionadded directive

The ''normalizer'' option was introduced in Symfony 5.3.

' is a backtick, I am currently on a phone 📱😄

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

.. _`PHP callable`: https://www.php.net/callable