CODEWITHSUNDEEP
listfileuploadoption-typefastapi
sampath kumar
sampath kumar

Reputation: 41

In FastAPI - Unable to make multiple UploadFile optional

I am trying to make UploadFile optional in FastAPI, in the process, I am able to make a single file optional, but got an error if I convert it to multiple files.

# Making optional for single uploadfile
@app.post("/optional-file")
async def optionalFile(file: Optional[UploadFile] = File(None)):
    if not file:
        print("no file")
        return "no file"
    print(file.filename)
    return {"name": file.filename}

# Making optional for multiple uploadfile
@app.post("/optional-files")
async def optionalFiles(files: Optional[List[UploadFile]] = File(None)):
    if not files:
        print("no files")
        return "no files"
    print(file[0].filename)
    return {"name": file[0].filename}

and I am getting this error in return.

{"detail":[{"loc":["body","files",0],"msg":"Expected UploadFile, received: <class 'str'>","type":"value_error"}]}

Thanks in advance for any sort of help provided.

Upvotes: 4

Views: 1219

Answers (1)

Артур Гильметдинов
Артур Гильметдинов

Reputation: 131

I solved it with:

def get_files(files_list: List[Union[UploadFile, str]] = File(None)):
    if isinstance(files_list, str):
        files_list = []

I send '', if i have no files to send.

Upvotes: 2

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