..warning::

This constraint does not support Doctrine types like ``simple_array``,

``json``, or ``jsonb``, nor does it handle association mappings such as

``OneToMany`` or ``ManyToMany`` relationships. It may also not work

correctly with custom Doctrine types. To check uniqueness for these fields,

define a custom ``repositoryMethod`` that implements the required logic.

..warning::

This constraint doesn't provide any protection against `race conditions`_.

that haven't been persisted as entities yet. You'll need to create your own

validator to handle that case.

..warning::

This constraint does not support Doctrine types such as

``simple_array``, ``json``, or ``jsonb``, nor does it handle association mappings

like ``OneToMany`` and ``ManyToMany`` relationships. It may also not work correctly

with custom Doctrine types. To perform uniqueness checks on such fields, you must

define a custom ``repositoryMethod`` that implements the desired logic.

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