public function getInputFilterSpecification()
    {
        return array(
            'fsOne' => array(
                'email' => array(
                    'validators' => array(
                        array(
                            'name' => 'DoctrineModule\Validator\NoObjectExists',
                            'options' => array(
                                'object_repository' => $this->repository,
                                'fields' => 'email',
                            ),
                            'messages' => array(
                                'objectFound' => 'Sorry guy, a user with this email already exists !'
                            )
                        )
                    )
                )
            )
        );
    }