FastAPI · interview question

Which naming or modeling choice is strongest for validation?

Multiple choiceMediumchapter-13-curatedpremiumfastapivalidation

python

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 value

Solve the symptom with comments only and avoid changing the code shape around validation.Keep validation implicit so the script stays short and hope the next engineer infers the rule.Delay clarity until production traffic reveals the edge case and then patch it under pressure.Use names and structures that describe the business fact directly instead of temporary implementation noise.

Answer and explanation

Correct answer

D. Use names and structures that describe the business fact directly instead of temporary implementation noise.

Why

Clear naming and modeling shorten debugging, review, and onboarding time.

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Which naming or modeling choice is strongest for validation?

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