[QUESTION] How to hide certain fields in Pydantic models? · Issue #1378 · tiangolo/fastapi

from pydantic import BaseModel, Field


class CustomBaseModel(BaseModel):
    def dict(self, **kwargs):
        hidden_fields = set(
            attribute_name
            for attribute_name, model_field in self.__fields__.items()
            if model_field.field_info.extra.get("hidden") is True
        )
        kwargs.setdefault("exclude", hidden_fields)
        return super().dict(**kwargs)


class Book(CustomBaseModel):
    author: str
    title: str
    genre: str = Field(..., hidden=True)


m = Book(
    author="Antoine de Saint-Exupéry",
    title="The Little Prince",
    genre="Novella",
)
print(m.genre)  # Novella
print(m.dict())  # {'author': 'Antoine de Saint-Exupéry', 'title': 'The Little Prince'}