public static function loadValidatorMetadata(ClassMetadata $metadata)
{
$metadata->addConstraint(new Callback('validate'));
$metadata->addPropertyConstraint('firstName', new NotBlank());
$metadata->addPropertyConstraint('firstName', new Length(array('min' => 2, 'max' => 50)));
$metadata->addPropertyConstraint('lastName', new NotBlank());
$metadata->addPropertyConstraint('lastName', new Length(array('min' => 2, 'max' => 50)));
$metadata->addPropertyConstraint('whereLearnt', new Choice(array('choices' => WhereLearntAbout::getChoiceIds())));
$metadata->addPropertyConstraint('age', new NotBlank());
$metadata->addPropertyConstraint('email', new Email());
$metadata->addPropertyConstraint('whyParticipate', new Length(array('min' => 2, 'max' => 200)));
$metadata->addPropertyConstraint('howManyTimes', new NotBlank());
$metadata->addPropertyConstraint('howManyTimes', new Range(['min' => 0]));
}
