/**
* This function will throw an exception when any of the options is missing or invalid.
*/
protected function guardAgainstInvalidSlugOptions()
{
if (!count($this->slugOptions->generateSlugFrom)) {
throw InvalidOption::missingFromField();
}
if (!strlen($this->slugOptions->slugField)) {
throw InvalidOption::missingSlugField();
}
if ($this->slugOptions->maximumLength <= 0) {
throw InvalidOption::invalidMaximumLength();
}
}
