Custom validation rule in model

4

You would need something like this

$rules->add(function ($entity, $options) {
    return ($entity->a == 1) && ($entity->b == 1);
}, 'aAndBAreOne');

Or if the check is more complicated than use an entity method

https://book.cakephp.org/3.0/en/orm/validation.html#using-entity-methods-as-rules

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