exchange-2.0/app/Models/Currency.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasOne;
use Illuminate\Database\Eloquent\SoftDeletes;

use Illuminate\Database\Eloquent\Relations\HasMany;

/**
 * Class Currency
 * @package App\Models
 *
 * @property int $country_id
 * @property string $name
 * @property string $short_code
 * @property string $symbol
 */

class Currency extends AbstractModel
{
    use SoftDeletes;

    protected $table = 'currencies';

    /**
     * Get the attributes that should be cast.
     *
     * @return array<string, string>
     */
    protected function casts(): array
    {
        return [
            'deleted_at' => 'datetime',
        ];
    }

    /**
     * @return BelongsTo
     */
    public function country(): BelongsTo
    {
        return $this->BelongsTo(Country::class, 'country_id', 'id');
    }

    /**
     * @return HasMany
     */
    public function rates(): HasMany
    {
        return $this->hasMany(CurrencyRate::class, 'currency_id');
    }
}