# Temukan bug-nya: Ruby on Rails

> Satu potongan kode. Temukan bug-nya, atau buktikan tidak ada.

Tantangan harian: 2026-08-19 (UTC) · Mid-Level

```ruby
class CartCalculator
  def total_with_discount(items, discount_rate)
    subtotal = items.sum(&:price)
    discount = subtotal * discount_rate
    subtotal - discount
  end
end
```

## Keputusanmu

- Celah keamanan
- Bug logika
- Gaya kode
- Tidak ada masalah

Satu percobaan per hari. Jawaban muncul langsung setelahnya.

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