InvoiceShelf/app/Models/ExchangeRateLog.php

<?php

namespace InvoiceShelf\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class ExchangeRateLog extends Model
{
    use HasFactory;

    protected $guarded = [
        'id',
    ];

    protected $casts = [
        'exchange_rate' => 'float',
    ];

    public function currency()
    {
        return $this->belongsTo(Currency::class);
    }

    public function company()
    {
        return $this->belongsTo(Company::class);
    }

    public static function addExchangeRateLog($model)
    {
        $data = [
            'exchange_rate' => $model->exchange_rate,
            'company_id' => $model->company_id,
            'base_currency_id' => $model->currency_id,
            'currency_id' => CompanySetting::getSetting('currency', $model->company_id),
        ];

        return self::create($data);
    }
}