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Data Access · interview question

A bug appears around repository boundaries. What is the strongest first debugging move?

Multiple choiceHardchapter-11-curatedpremiumdata-accessrepository-boundaries
python
class OrderRepository:
    def by_id(self, order_id: str) -> tuple | None:
        return connection.execute("SELECT id FROM orders WHERE id = ?", (order_id,)).fetchone()
Choose one answer
Answer and explanation

Correct answer

D. Trace one concrete example, inspect the state transitions, and compare them to the intended rule before rewriting anything.

Why

That approach is reliable because it creates evidence. If business rules and SQL are tangled together, both testing and change impact get worse.

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