Class SubDate

tests/test_json.py:141–147

def test_subclass_encoding():
    class SubDate(datetime):
        @classmethod
        def __get_pydantic_core_schema__(cls, source_type: Any, handler: GetCoreSchemaHandler) -> CoreSchema:
            def val(v: datetime) -> SubDate:
                return SubDate.fromtimestamp(v.timestamp())

            return core_schema.no_info_after_validator_function(val, handler(datetime))

    class Model(BaseModel):
        a: datetime