Repeater / Builder Unique

Builder-Unique.php

<?php

//Use on a field inside a builder

->rule(function (
    Component $component,
    mixed $state,
) {
    return function (string $attribute, $value, Closure $fail) use ($component, $state) {
        /** @var array<string,array<string,mixed>> */
        $siblings = $component->getContainer()->getParentComponent()?->getState();

        if (blank($siblings)) {
            return;
        }

        $componentKey = (string) Str::of($component->getStatePath())
            ->beforeLast(".data.{$component->getName()}")
            ->afterLast('.');


        $isDuplicate = collect($siblings)
            ->reject(fn ($sibling, $key) => $key == $componentKey)
            ->pluck("data.{$component->getName()}")
            ->contains($state);

        if ($isDuplicate) {
            $fail("{$component->getLabel()} must be unique.");
        }
    };
})

Repeater-Unique.php

<?php

//Use on a field inside a repeater

->rule(function (
    Field $component,
    mixed $state,
) {
    return function (string $attribute, $value, Closure $fail) use ($component, $state) {
        /** @var array<string,array<string,mixed>> */
        $siblings = $component->getContainer()->getParentComponent()?->getState();

        if (blank($siblings)) {
            return;
        }

        $componentKey = (string) Str::of($component->getStatePath())
            ->beforeLast(".{$component->getName()}")
            ->afterLast('.');


        $isDuplicate = collect($siblings)
            ->reject(fn ($sibling, $key) => $key == $componentKey)
            ->pluck($component->getName())
            ->contains($state);

        if ($isDuplicate) {
            $fail("{$component->getLabel()} field must be unique.");
        }
    };
})