``ignoreNull``

**type**: ``boolean`` **default**: ``true``

**type**: ``boolean``| ``array`` | ``string``**default**: ``true``

If this option is set to ``true``, then the constraint will allow multiple

entities to have a ``null`` value for a field without failing validation.

If set to ``false``, only one ``null`` value is allowed - if a second entity

also has a ``null`` value, validation would fail.

As of Symfony 6.3, the ``UniqueEntity`` constraint allows you to ignore null

values on specific fields when checking for uniqueness. This feature can be

helpful when you want to validate the uniqueness of a combination of fields,

but want to exclude combinations where one or more of the fields are null.

..code-block::php

In the example above, null values for the "name" field will be ignored

when checking for uniqueness.

Similarly, you can ignore null values for multiple fields:

..code-block::php

In this case, null values for both the "name" and "country" fields will be ignored.

``message``