Model an Order with a nested Product list in Pydantic
It tests Pydantic nested model composition. Define Product as BaseModel, then Order with products: list[Product]; Pydantic recursively coerces each dict and raises ValidationError on failure. A red flag is insisting on manual iteration.
It tests declarative schema composition and Pydantic's recursive validation. A strong answer defines Product with name: str and price: float, then Order with products: list[Product]. When Order receives a dict with product dicts, Pydantic instantiates each inner dict as a Product, running type coercion recursively. If any product dict is invalid, Pydantic aggregates errors into a single ValidationError with location details. A red flag is suggesting you need a for-loop or pre-validation function to handle the list manually.
Read the original → pydantic.dev
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- #python
- #fastapi
- #data-validation
- #nested-models
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