I have a
post and it can have many
revisions, revision has an
effective_date column, I want to make sure when creating a new revision, effective dates must be
>= the previous revision’s effective date.
I have tried using https://laravel.com/docs/5.5/validation#rule-after-or-equal
'effective_date' => 'date|nullable|after_or_equal:effective_date'
but it's not working for me, please help