https://www.dropbox.com/s/8az8omglhq14kpm/Screen%20Shot%202017-01-28%20at%204.11.44%20AM.png?dl=0

OctoberCMS documentation says it s available http://octobercms.com/docs/services/validation#rule-in

From laravel: https://laravel.com/docs/5.4/validation#rule-in

Last updated 8 years ago

October is based on Laravel 5.1, and there this class is simply not avaialble. It appears it has been introduced in L5.3

True. I could have just done it in the simple way without the "Rule" class. Thanks! BTW, If it's come to be a need, can I update the Laravel version of OctoberCMS?

$validator = Validator::make($inputs, [ 'layout-code' => [ 'required', 'max:1', 'in:foo, bar', ], ]);