FastAPI · interview question
Which option is the safer default when shipping code around validation?
Multiple choiceHardchapter-13-curatedpremiumfastapivalidation
class CreateOrderRequest(BaseModel):
sku: str
quantity: int
@field_validator("quantity")
@classmethod
def quantity_must_be_positive(cls, value: int) -> int:
if value <= 0:
raise ValueError("quantity must be positive")
return valueAnswer and explanation
Correct answer
D. Choose the simpler shape that keeps the rule obvious, validated, and easy to observe in logs or tests.
Why
The safest default is usually the one that lowers ambiguity and makes errors easier to diagnose.
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