MyRunnable Class — langchain Architecture

Source Code

libs/core/tests/unit_tests/runnables/test_configurable.py lines 14–57

class MyRunnable(RunnableSerializable[str, str]):
    my_property: str = Field(alias="my_property_alias")
    _my_hidden_property: str = ""

    model_config = ConfigDict(
        populate_by_name=True,
    )

    @model_validator(mode="before")
    @classmethod
    def my_error(cls, values: dict[str, Any]) -> Any:
        if "_my_hidden_property" in values:
            msg = "Cannot set _my_hidden_property"
            raise ValueError(msg)
        return values

    @model_validator(mode="after")
    def build_extra(self) -> Self:
        self._my_hidden_property = self.my_property
        return self

    @override
    def invoke(
        self, input: str, config: RunnableConfig | None = None, **kwargs: Any
    ) -> Any:
        return input + self._my_hidden_property

    def my_custom_function(self) -> str:
        return self.my_property

    def my_custom_function_w_config(
        self,
        config: RunnableConfig | None = None,
    ) -> str:
        _ = config
        return self.my_property

    def my_custom_function_w_kw_config(
        self,
        *,
        config: RunnableConfig | None = None,
    ) -> str:
        _ = config
        return self.my_property