I use pydantic in a FastAPI project to serialize SQLAlchemy entity objects, and I need to access the original entity object in @computed_field methods and validators in order to access data from relationships (which are not supposed to be themselves serialized).

This is what I tried so far:

    def __init__(__pydantic_self__, **kwargs) -> None:
        super().__init__(**kwargs)
        print(kwargs)  # not called at all

    @model_validator(mode="before")
    @classmethod
    def validate_model(cls, values):
        # 'values' contains the desired entity object, but there is no access to the model instance,
        # so I can't save it for future use

    @computed_field
    @property
    def extra_prop(self) -> bool:
        # no access to the entity object

    def model_post_init(self, ctx):
        print(ctx)  # always None

Is there any supported way to do this, or a workaround known to work?