Extends CastsAttributes specifically for creating models derived from JSON fields.

CastsJsonAttributes.php

<?php


namespace App\Casts;


use Illuminate\Contracts\Database\Eloquent\CastsAttributes;

abstract class CastsJsonAttributes implements CastsAttributes
{
    abstract public function createModel(array $data);

    public function get($model, string $key, $value, array $attributes)
    {
        $data = json_decode($value, true);
        return $this->createModel($data ?? []);
    }

    public function set($model, string $key, $value, array $attributes)
    {
        if (is_array($value)) {
            return json_encode($value);
        }

        return $value ? $value->toJson() : json_encode([]);
    }
}

JsonToCollectionCast.php

<?php


namespace App\Casts;


use App\JsonModel;

class JsonToCollectionCast extends CastsJsonAttributes
{
    public function createModel(array $data)
    {
        return collect($data)->map(fn($attributes) => new JsonModel($attributes));
    }
}

JsonToModelCast.php

<?php


namespace App\Casts;


use App\JsonModel;

class JsonToModelCast extends CastsJsonAttributes
{
    public function createModel(array $data)
    {
        return new JsonModel($data);
    }
}