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[英]How to set swagger ui to use list fields in query parameters with FastAPI
[英]How to alter the ouput of a get list, or use an alternate serializer in FastAPI?
我正在嘗試根據 get 參數更改 FastAPI 上列表視圖的內容。 由於格式由 pydantic model 定義,我如何自定義它(或在視圖中使用替代 model)?
這是我的觀點:
from fastapi_pagination import Page, Params, paginate
from pydantic import BaseModel
from sqlalchemy.orm import Session
class EventSerializer(BaseModel):
id: str
# ...
class EventAttendeeSerializer(BaseModel):
id: str
event: str # contains the event UUID
# ...
class Config:
orm_mode = True
@api.get("/", response_model=Page[EventAttendeeSerializer])
async def get_list(db: Session, pagination: Params = Depends(), extend: str = None):
objects = db.query(myDbModel).all()
if "event" in extend.split(","):
# return EventSerializer for each object instead of id
return paginate(objects, pagination)
在運行時,它會像這樣工作:
GET /v1/event-attendees/
{
"items": [
{
"id": <event_attendee_id>,
"event": <event_id>,
}
],
"total": 1,
"page": 1,
"size": 50,
}
GET /v1/event-attendees/?extend=event
{
"items": [
{
"id": <event_attendee_id>,
"event": {
"id": <event_id>,
# ...
}
}
],
"total": 1,
"page": 1,
"size": 50,
}
我在 pydantic 和 FastAPI 文檔和源代碼中搜索了某種掛鈎,但沒有找到任何相關內容。 有人可以幫忙嗎?
您可以使用Union
(兩種類型)對response_model
進行decalre,並在滿足條件時返回您希望的 model。 由於您要返回對象/模型列表,因此可以將response_model
聲明為Union
List
。
from fastapi import FastAPI
from pydantic import BaseModel
from typing import List, Union
class Simple(BaseModel):
id: int
class Specific(Simple):
description: str
RESULT = {
'id': 1,
'description': 'test'
}
app = FastAPI()
@app.get('/results', response_model=List[Union[Specific, Simple]])
def get_results(specific: bool = False):
if specific:
results = [Specific(**RESULT)] * 2
else:
results = [Simple(**RESULT)] * 2
return results
使用 FastAPI 0.89.0+ ,您可以選擇在 function 返回類型注釋中聲明返回類型 / response_model
,例如:
@app.get('/results')
def get_results(specific: bool = False) -> List[Union[Specific, Simple]]:
if specific:
# ...
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