return False
    else:
        assert isinstance(
            param_field.field_info, params.Body
        ), f"Param: {param_field.name} can only be a request body, using Body()"
        return True


def add_param_to_fields(*, field: ModelField, dependant: Dependant) -> None:
    field_info = field.field_info
    field_info_in = getattr(field_info, "in_", None)

    body_schema = get_schema_from_model_field(
        field=body_field,
        schema_generator=schema_generator,
        model_name_map=model_name_map,
        field_mapping=field_mapping,
        separate_input_output_schemas=separate_input_output_schemas,
    )
    field_info = cast(Body, body_field.field_info)
    request_media_type = field_info.media_type
    required = body_field.required

                    "type": "missing",
                    "loc": ["body", "file"],
                    "msg": "Field required",
                    "input": None,
                },
                {
                    "type": "missing",
                    "loc": ["body", "fileb"],
                    "msg": "Field required",
                    "input": None,
                },
                {

@needs_pydanticv2
def test_encode_custom_json_encoders_model_pydanticv2():
    from pydantic import field_serializer

    class ModelWithCustomEncoder(BaseModel):
        dt_field: datetime

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

    assert response.json() == IsDict(
        {
            "detail": [
                {
                    "type": "missing",
                    "loc": ["body", 0, "name"],
                    "msg": "Field required",
                    "input": {"age": "five"},
                },
                {
                    "type": "decimal_parsing",
                    "loc": ["body", 0, "age"],

                    "loc": ["body", "file"],
                    "msg": "Field required",
                    "input": None,
                }
            ]
        }
    ) | IsDict(
        # TODO: remove when deprecating Pydantic v1
        {
            "detail": [
                {
                    "loc": ["body", "file"],
                    "msg": "field required",
                    "type": "value_error.missing",

                    "loc": ["body", "item2"],
                    "msg": "Field required",
                    "input": None,
                }
            ]
        }
    ) | IsDict(
        # TODO: remove when deprecating Pydantic v1
        {
            "detail": [
                {
                    "loc": ["body", "item2"],
                    "msg": "field required",
                    "type": "value_error.missing",

            {
                "loc": ["query", "foo"],
                "msg": "Field required",
                "type": "missing",
                "input": None,
            }
        )
        # TODO: remove when deprecating Pydantic v1
        | IsDict(
            {
                "loc": ["query", "foo"],
                "msg": "field required",
                "type": "value_error.missing",
            }
        )

                    "type": "missing",
                    "loc": ["body", "file"],
                    "msg": "Field required",
                    "input": None,
                },
                {
                    "type": "missing",
                    "loc": ["body", "fileb"],
                    "msg": "Field required",
                    "input": None,
                },
                {

                    "type": "missing",
                    "loc": ["body", "item"],
                    "msg": "Field required",
                    "input": None,
                },
                {
                    "type": "missing",
                    "loc": ["body", "user"],
                    "msg": "Field required",
                    "input": None,
                },
                {