Description

Pydantic models use the field alias for validation and the field name for serialization (unless prefer_alias=True is passed explicitly). However the generated OpenAPI shows the alias for both request and response if the model is the same.

URL to code causing the issue

No response

MCVE

from litestar import Litestar, post
from pydantic import BaseModel, Field


class User(BaseModel):
    first_name: str = Field(alias="FirstName")
    last_name: str = Field(alias="LastName")


@post()
async def test(data: User) -> User:
    return data


app = Litestar(route_handlers=[test])

Screenshots

Litestar Version

2.4.3