Eloquent Castable

<?php

class Product extends Eloquent
{
    use \Artisanry\Castable\Castable;

    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'price' => 'money'
    ];

    /**
     * The user defined caster classes.
     *
     * @var array
     */
    protected $customCasters = [
        'money' => \App\Casters\MoneyCaster::class
    ];

    /**
     * Config for \App\Casters\MoneyCaster
     *
     * @return array
     */
    public function getMoneyCasterConfig()
    {
        return ['currency' => $this->invoice->currency->code];
    }
}

<?php

namespace App\Casters;

use Artisanry\Castable\Casters\AbstractCaster;

class MoneyCaster extends AbstractCaster
{
    /**
     * {@inheritdoc}
     */
    public function save($value)
    {
        return $value;
    }

    /**
     * {@inheritdoc}
     */
    public function load($value)
    {
        return new Money((int) $value, new Currency($this->options['currency']));
    }
}