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Using YAML to configure Validation ================================== Simplicity is at the heart of Silex so there is no out of the box solution to use YAML files for validation. But this doesn't mean that this is not possible. Let's see how to do it. First, you need to install the YAML Component: .. code-block:: bash composer require symfony/yaml Next, you need to tell the Validation Service that you are not using ``StaticMethodLoader`` to load your class metadata but a YAML file:: $app->register(new ValidatorServiceProvider()); $app['validator.mapping.class_metadata_factory'] = new Symfony\Component\Validator\Mapping\Factory\LazyLoadingMetadataFactory( new Symfony\Component\Validator\Mapping\Loader\YamlFileLoader(__DIR__.'/validation.yml') ); Now, we can replace the usage of the static method and move all the validation rules to ``validation.yml``: .. code-block:: yaml # validation.yml Post: properties: title: - NotNull: ~ - NotBlank: ~ body: - Min: 100