The:class:`Symfony\\Component\\Validator\\Constraints\\Cascade` was

introduced in Symfony 5.2 and requires PHP 7.4.

The Cascade constraint is used to validate a whole class. It allows to

omit to add the:doc:`/reference/constraints/Valid` constraint on each

child object of your class you want to validate.

The Cascade constraint is used to validate a whole class, including all the

objects that might be stored in its properties. Thanks to this constraint,

you don't need to add the:doc:`/reference/constraints/Valid` constraint on

every child object that you want to validate in your class.

Applies to:ref:`class<validation-class-target>`

In the following example, the

:class:`Symfony\\Component\\Validator\\Constraints\\Cascade` constraint

will tell the validator to validate allfields of the class, including

will tell the validator to validate allproperties of the class, including

constraints that are set in the child classes ``BookMetadata`` and

``Author``: