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Domain Modeling · interview question

Which naming or modeling choice is strongest for invariants in __post_init__?

Multiple choiceMediumchapter-7-curatedpremiumdomain-modelinginvariants-in-post-init
python
from dataclasses import dataclass

@dataclass
class OrderLine:
    sku: str
    quantity: int

    def __post_init__(self) -> None:
        if self.quantity <= 0:
            raise ValueError("quantity must be positive")
Choose one answer
Answer and explanation

Correct answer

C. 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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