如何在FastAPI中将文件多文件上传字段设置为可选字段

Question

from typing import List

from fastapi import FastAPI, File, UploadFile
from fastapi.responses import HTMLResponse

app = FastAPI()


@app.post("/files/")
async def create_files(files: List[bytes] = File(...)):
    return {"file_sizes": [len(file) for file in files]}


@app.post("/uploadfiles/")
async def create_upload_files(files: List[UploadFile] = File(...)):
    return {"filenames": [file.filename for file in files]}

我需要将多个文件上传字段作为可选字段获取文档具有上述代码，但没有详细说明如何将“FileUpload”字段设置为可选字段。

Answer 1

您可以使用None代替... （省略号）来制作字段Optional

这是一个Optional领域。

from typing import Optional

files: Optional[List[bytes]] = File(None)

这是必填字段。

files: List[bytes] = File(...)

您的案例的工作示例。

from typing import List, Optional

from fastapi import FastAPI, File, UploadFile
from fastapi.responses import HTMLResponse

app = FastAPI()


@app.post("/files/")
async def create_files(files: Optional[List[bytes]] = File(None)):
    return {"file_sizes": [len(file) for file in files]}


@app.post("/uploadfiles/")
async def create_upload_files(files: Optional[List[UploadFile]] = File(None)):
    return {"filenames": [file.filename for file in files]}