If your constraint validator has dependencies, such as a database connection,

it will need to be configured as a service in the Dependency Injection

Container. This service must include the ``validator.constraint_validator``

tag and an ``alias`` attribute:

tag andmay includean ``alias`` attribute:

..configuration-block::

validator::

the constraint, with ``Validator`` appended. You can override this in your constraint class::

As mentioned above, Symfony will automatically look for a class named after

the constraint, with ``Validator`` appended. If your constraint validator

is defined as a service, it's important that you override the

``validatedBy()`` method to return the alias used when defining your service,

otherwise Symfony won't use the constraint validator service, and will

instantiate the class instead, without any dependencies injected.

Class Constraint Validator