Load Eloquent directly from DB stored in json format snapshot data.

Example.php

<?php

namespace App\Models;

class Example extends Model
{
    /**
     * @see Post
     * @param string $value
     * @return Post|\Illuminate\Database\Eloquent\Model
     */
    public function getPostAttribute($value)
    {
        return $this->hydrateModelFromJson(Post::class, $value);
    }
}

Model.php

<?php

namespace App\Models;

abstract class Model extends \Illuminate\Database\Eloquent\Model
{
    protected function hydrateModelFromJson(string $model, $value)
    {
        return $model::hydrate([$this->fromJson($value)])->first();
    }
}