Filament: Currency Fields with Casts from Cents

First, we have created a Currency Model with a name and symbol fields. Then, we have seeded some basic currencies:

database/seeders/DatabaseSeeder.php

use App\Models\Currency;
 
// ...
 
$currencies = [
    [
        'name' => 'USD',
        'symbol' => '$',
    ],
    [
        'name' => 'EUR',
        'symbol' => '€',
    ],
    [
        'name' => 'GBP',
        'symbol' => '£',
    ],
];
 
foreach ($currencies as $currency) {
    Currency::create($currency);
}
 
// ...

Next, we created a model that uses currency. In our case, this was SubscriptionPlan which has a price. To store the price, we have created a MoneyCast that stores the price as an integer in the database:

php artisan make:cast MoneyCast

In the MoneyCast, we have defined the set and get methods to store and retrieve the...