LLD - Design — Online Shopping Cart
If a Cart contains multiple products with varying quantities, how should the Order class store this information to maintain data integrity after checkout?
If a Cart contains multiple products with varying quantities, how should the Order class store this information to maintain data integrity after checkout?
hard📝 Trade-off Q9 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand data integrity needs
Order must keep a snapshot of products and quantities at checkout time.Step 2: Avoid referencing mutable Cart object
Referencing Cart risks data changes after checkout, so copying data is safer.Final Answer:
Copy product details and quantities into Order's own data structure -> Option CQuick Check:
Order stores independent copy for integrity [OK]
Quick Trick: Copy data to Order to avoid changes after checkout [OK]
Common Mistakes:
MISTAKES- Referencing Cart directly
- Storing only IDs without quantities
- Clearing Cart without saving order data
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