Sebastián Ramírez <******@****.***> 1652485102 -0500

try:
    import orjson
except ImportError:  # pragma: nocover
    orjson = None  # type: ignore


class UJSONResponse(JSONResponse):
    """
    JSON response using the high-performance ujson library to serialize data to JSON.

    Read more about it in the
    [FastAPI docs for Custom Response - HTML, Stream, File, others](https://fastapi.tiangolo.com/advanced/custom-response/).
    """

        return {"fast_uuid": asyncpg_uuid}

    class SomeCustomClass(BaseModel):
        model_config = {"arbitrary_types_allowed": True}

        a_uuid: MyUuid

        @field_serializer("a_uuid")
        def serialize_a_uuid(self, v):
            return str(v)

    @app.get("/get_custom_class")
    def return_some_user():
        # Test that the fix also works for custom pydantic classes

            except ValidationError as exc:
                return None, _regenerate_error_with_loc(
                    errors=exc.errors(include_url=False), loc_prefix=loc
                )

        def serialize(
            self,
            value: Any,
            *,
            mode: Literal["json", "python"] = "json",
            include: Union[IncEx, None] = None,
            exclude: Union[IncEx, None] = None,

        if errors:
            raise ResponseValidationError(
                errors=_normalize_errors(errors), body=response_content
            )

        if hasattr(field, "serialize"):
            return field.serialize(
                value,
                include=include,
                exclude=exclude,
                by_alias=by_alias,
                exclude_unset=exclude_unset,

                    show it as the response (JSON Schema).
                * Serialization: you could return an arbitrary object and the
                    `response_model` would be used to serialize that object into the
                    corresponding JSON.
                * Filtering: the JSON sent to the client will only contain the data

Nima Mashhadi M. Reza <******@****.***> 1596457747 +0430

Luis R <******@****.***> 1661522207 +0200

* Fix typo in release notes. PR [#1051](https://github.com/tiangolo/fastapi/pull/1051) by [@sattosan](https://github.com/sattosan).
* Refactor/clarify `serialize_response` parameter name to avoid confusion. PR [#1031](https://github.com/tiangolo/fastapi/pull/1031) by [@patrickmckenna](https://github.com/patrickmckenna).

@needs_pydanticv2
def test_pydanticv2():
    from pydantic import field_serializer

    class ModelWithDatetimeField(BaseModel):
        dt_field: datetime

        @field_serializer("dt_field")
        def serialize_datetime(self, dt_field: datetime):
            return dt_field.replace(microsecond=0, tzinfo=timezone.utc).isoformat()

    app = FastAPI()
    model = ModelWithDatetimeField(dt_field=datetime(2019, 1, 1, 8))