What is wrong with that code? 🛍️
```javascript
async function updateCartAttributes() {
const response = await fetch('/cart/update.js', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({
attributes: {
'note': 'Please gift wrap',
'__sign': 'For Julia',
}
})
});
return await response.json();
}
```
### Explanation
The code is perfectly valid. Let's break down why each answer is incorrect except A:
1. ✅ "Nothing, all is good" - Correct!
2. ❌ "Attribute cannot have double underscore prefix" - Double underscore prefix is specifically allowed and used to create private attributes that won't be accessible in Liquid
3. ❌ "Cart cannot have attributes" - Cart attributes are a core feature of Shopify's cart system
4. ❌ "It's missing product/variant id" - When only updating cart attributes, you don't need to include product/variant IDs
Key points:
- Cart attributes can be updated independently of cart items
- Double underscore prefix (__) is valid and makes attributes private
- The code follows all Shopify Cart API best practices
Reference:
- [Cart Attributes in Liquid](https://shopify.dev/docs/api/liquid/objects/cart#cart-attributes)
- [Cart API](https://shopify.dev/api/ajax/reference/cart)
Answer Options:
- Nothing, all is good
- Attribute cannot have double underscore prefix
- Cart cannot have attributes
- It's missing product/variant id