How would you use a Pydantic response_model to enforce output structure?
Tests separation of internal models from API contracts. Define a Pydantic output model with only safe fields, set it as the endpoint response_model, and let FastAPI filter and validate.
Tests separation of internal database models from public API contracts via explicit Pydantic schemas. A strong answer defines a dedicated output model containing only the fields the client should see, assigns it to the path operation's response_model parameter, and relies on FastAPI's automatic filtering and validation to strip extra or sensitive data. Red flag: mutating the internal model or a raw dictionary to remove fields before returning, which breaks type safety and leaks implementation details.
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