/**
* @param $object
* @param $attribute
*
* @return null
*/
protected function validateAttribute($object, $attribute)
{
$urlFormat = $object->{$attribute};
if ($urlFormat) {
// Remove any leading or trailing spaces/slashes
$urlFormat = trim($urlFormat, '/ ');
$object->{$attribute} = $urlFormat;
if ($this->requireSlug) {
if (!ElementHelper::doesUrlFormatHaveSlugTag($urlFormat)) {
$this->addError($object, $attribute, Craft::t('{attribute} must contain “{slug}”'));
}
}
}
}