quantityDelta example

class StockAlterationTest extends TestCase
{
    public function testAccessors(): void
    {
        $alteration = new StockAlteration('12345', '67890', 10, 5);

        static::assertEquals('12345', $alteration->lineItemId);
        static::assertEquals('67890', $alteration->productId);
        static::assertEquals(10, $alteration->quantityBefore);
        static::assertEquals(5, $alteration->newQuantity);
        static::assertEquals(5, $alteration->quantityDelta());

        $alteration = new StockAlteration('12345', '67890', 3, 10);

        static::assertEquals('12345', $alteration->lineItemId);
        static::assertEquals('67890', $alteration->productId);
        static::assertEquals(3, $alteration->quantityBefore);
        static::assertEquals(10, $alteration->newQuantity);
        static::assertEquals(-7, $alteration->quantityDelta());
    }
}

SQL;

        $query = new RetryableQuery(
            $this->connection,
            $this->connection->prepare($sql)
        );

        foreach ($changes as $alteration) {
            $query->execute([
                'quantity' => $alteration->quantityDelta(),
                'id' => Uuid::fromHexToBytes($alteration->productId),
                'version' => Uuid::fromHexToBytes(Defaults::LIVE_VERSION),
            ]);
        }

        $this->updateAvailableFlag(array_column($changes, 'productId'), $context);
    }

    /** * @param list<string> $productIds */