osb/app/Casts/CollectionOrNull.php

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<?php
namespace App\Casts;
use Illuminate\Contracts\Database\Eloquent\CastsAttributes;
use Illuminate\Database\Eloquent\Model;
class CollectionOrNull implements CastsAttributes
{
/**
* Cast the given value.
*
* @param array<string, mixed> $attributes
*/
public function get(Model $model, string $key, mixed $value, array $attributes): mixed
{
return collect(json_decode($value, true));
}
/**
* Prepare the given value for storage.
*
* @param array<string, mixed> $attributes
*/
public function set(Model $model, string $key, mixed $value, array $attributes): mixed
{
return $value->count() ? json_encode($value) : NULL;
}
}