我有以下课程：
class Quiz(BaseModel):
question: str
subject: str
choice: str = Query(choices=('eu', 'us', 'cn', 'ru'))
我可以像这样基于此类渲染表单
@api.post("/postdata")
def post_data(form_data: Quiz = Depends()):
return form_data
如何显示选择字段的下拉列表？
Option 1
使用文字值。Literal https://pydantic-docs.helpmanual.io/usage/types/#literal-typetype 是 Python 标准库自 Python 3.8 起的一个新功能（在 Python 3.8 之前，它需要打字扩展 https://pypi.org/project/typing-extensions/包）并受 Pydantic 支持。例子：
from fastapi import FastAPI, Depends
from pydantic import BaseModel
from typing import Literal
app = FastAPI()
class Quiz(BaseModel):
question: str
subject: str
choice: Literal['eu', 'us', 'cn', 'ru'] = 'us'
@app.post('/submit')
def post_data(data: Quiz = Depends()):
return data
Option 2
Use Enums https://pydantic-docs.helpmanual.io/usage/types/#enums-and-choices（另请参阅 Python 的enum https://docs.python.org/3/library/enum.html模块，以及 FastAPI 的文档预定义值 https://fastapi.tiangolo.com/tutorial/path-params/#predefined-values）。通过拥有你的Enum子类继承自str，API 文档将能够知道这些值必须是类型string并且能够正确渲染。例子：
from fastapi import FastAPI, Depends
from pydantic import BaseModel
from enum import Enum
app = FastAPI()
class Country(str, Enum):
eu = 'eu'
us = 'us'
cn = 'cn'
ru = 'ru'
class Quiz(BaseModel):
question: str
subject: str
choice: Country = Country.us
@app.post('/submit')
def post_data(data: Quiz = Depends()):
return data
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