我是FastAPI新手(从FlaskTM迁移)，我正在尝试为我的GET路线创建一个PYDANIC模型

from fastapi import APIRouter,Depends
from pydantic import BaseModel
from typing import Optional,List

router = APIRouter()

class SortModel(BaseModel):
    field:    Optional[str]
    directions: List[str]

@router.get("/pydanticmodel")
def get_sort(criteria: SortModel = Depends(SortModel)):
    pass #my code for handling this route.....

当我运行curl -X GET http://localhost:XXXX/pydanticmodel?directions=up&directions=asc&field=id 时，收到422 Unprocessable Entity: {"detail":[{"loc":["body"],"msg":"field required","type":"value_error.missing"}]}