RuleForAbsentValue

Corex\Forms\Validation\RuleForAbsentValue · interface · Forms layer

A rule that is also asked when its field was left out of the request. The validator skips an optional field that is absent, so none of its rules run. That is right for a rule about the answer itself, and wrong for a rule about several fields (“at least one of these three must be filled”), which sits on optional fields and has the most to say when all of them are missing. A browser sends every field, empty, so it never reaches the gap; a request written by hand does. A rule opts in by implementing this instead of Rule. It is then handed null for the absent value, with the whole payload beside it. Nothing else changes for it, and no rule that does not opt in is ever handed an absent value: a site’s rule written before this existed keeps the behaviour it was written against.

Public API

No public methods.