private function createOrUpdate($rates)
{
foreach ($rates as $r) {
$date = Carbon::createFromFormat('Y-m-d', $r->date);
$start_of_day = $date->startOfDay();
$rate = Currency::where('currency', $r->currency)->first()->rates()->forDate($start_of_day)->first();
if (!$rate) {
$currency = Currency::where('currency', $r->currency)->first();
CurrencyRate::create(['currency_id' => $currency->id, 'rate' => $r->rate, 'for_date' => $start_of_day]);
} else {
$rate->rate = $r->rate;
$rate->save();
}
}
}
