public static function onValidate(ActiveRecord $Record, RecordValidator $validator)
{
$validator->validate(array('field' => 'Handle', 'required' => false, 'validator' => 'handle', 'errorMessage' => 'Handle can only contain letters, numbers, hyphens, and underscores'));
// check handle uniqueness
if ($Record->isFieldDirty('Handle') && !$validator->hasErrors('Handle') && $Record->Handle) {
$ExistingRecord = $Record::getByHandle($Record->Handle);
if ($ExistingRecord && $ExistingRecord->ID != $Record->ID) {
$validator->addError('Handle', 'Handle already registered');
}
}
}
