Enhancement: Support properties in DTOs

[sloria]

Summary

DataclassDTO (and potentially other DTO types--I only tested with a Dataclass) don't seem to support properties.

Basic Example

# /// script
# requires-python = ">=3.13"
# dependencies = [
#     "litestar",
#     "uvicorn",
# ]
# ///
from dataclasses import dataclass

import uvicorn
from litestar import Litestar, get
from litestar.dto import DataclassDTO, DTOConfig


@dataclass
class User:
    name: str

    @property
    def name_upper(self) -> str:
        return self.name.upper()


class UserDTO(DataclassDTO[User]):
    config = DTOConfig(
        include={"name_upper"},  # Doesn't work
    )


@get("/", dto=UserDTO)
async def get_user() -> User:
    return User(name="Alice")


app = Litestar(route_handlers=[get_user])

if __name__ == "__main__":
    uvicorn.run(app)

$ uv run repro.py
$ curl http://127.0.0.1:8000

Expected:

{"name_upper": "ALICE"}

Actual:

{}

Drawbacks and Impact

No response

Unresolved questions

No response

[provinzkraut]

Thanks for bringing this up @sloria, this should definitely be supported! :)