public static function editField($id, $value, $productId)
{
$stock = Stock::findOne($id);
if ($productAmount = $stock->getProducts()->where(['product_id' => $productId, 'stock_id' => $id])->one()) {
$productAmount->amount = $value;
$productAmount->save();
} else {
$productAmount = new StockToProduct();
$productAmount->amount = $value;
$productAmount->product_id = $productId;
$productAmount->stock_id = $id;
$productAmount->save();
}
}
